Hard coupling between tess4j and imageIO to avoid service registering

docs-core/pom.xml

@@ -138,11 +138,6 @@
       <artifactId>imageio</artifactId>
     </dependency>
     
-    <dependency>
-      <groupId>tess4j</groupId>
-      <artifactId>tess4j</artifactId>
-    </dependency>
-    
     <!-- Test dependencies -->
     <dependency>
       <groupId>junit</groupId>

docs-core/src/main/java/net/sourceforge/tess4j/TessAPI.java

@@ -0,0 +1,686 @@
+/**
+ * Copyright @ 2012 Quan Nguyen
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package net.sourceforge.tess4j;
+
+import com.sun.jna.*;
+import com.sun.jna.ptr.*;
+import java.nio.*;
+
+/**
+ * A Java wrapper for
+ * <code>Tesseract OCR 3.02 API</code> using
+ * <code>JNA Interface Mapping</code>.
+ */
+public interface TessAPI extends Library {
+
+    static final boolean WINDOWS = System.getProperty("os.name").toLowerCase().startsWith("windows");
+    /**
+     * Native library name.
+     */
+    public static final String LIB_NAME = "libtesseract302";
+    public static final String LIB_NAME_NON_WIN = "tesseract";
+    /**
+     * An instance of the class library.
+     */
+    public static final TessAPI INSTANCE = (TessAPI) Native.loadLibrary(WINDOWS ? LIB_NAME : LIB_NAME_NON_WIN, TessAPI.class);
+
+    /**
+     * When Tesseract/Cube is initialized we can choose to instantiate/load/run
+     * only the Tesseract part, only the Cube part or both along with the
+     * combiner. The preference of which engine to use is stored in
+     * <code>tessedit_ocr_engine_mode</code>.<br /> <br /> ATTENTION: When
+     * modifying this enum, please make sure to make the appropriate changes to
+     * all the enums mirroring it (e.g. OCREngine in
+     * cityblock/workflow/detection/detection_storage.proto). Such enums will
+     * mention the connection to OcrEngineMode in the comments.
+     */
+    public static interface TessOcrEngineMode {
+
+        public static final int OEM_TESSERACT_ONLY = (int) 0;
+        public static final int OEM_CUBE_ONLY = (int) 1;
+        public static final int OEM_TESSERACT_CUBE_COMBINED = (int) 2;
+        public static final int OEM_DEFAULT = (int) 3;
+    };
+
+    /**
+     * Possible modes for page layout analysis. These *must* be kept in order of
+     * decreasing amount of layout analysis to be done, except for
+     * <code>OSD_ONLY</code>, so that the inequality test macros below work.
+     */
+    public static interface TessPageSegMode {
+
+        public static final int PSM_OSD_ONLY = (int) 0;
+        public static final int PSM_AUTO_OSD = (int) 1;
+        public static final int PSM_AUTO_ONLY = (int) 2;
+        public static final int PSM_AUTO = (int) 3;
+        public static final int PSM_SINGLE_COLUMN = (int) 4;
+        public static final int PSM_SINGLE_BLOCK_VERT_TEXT = (int) 5;
+        public static final int PSM_SINGLE_BLOCK = (int) 6;
+        public static final int PSM_SINGLE_LINE = (int) 7;
+        public static final int PSM_SINGLE_WORD = (int) 8;
+        public static final int PSM_CIRCLE_WORD = (int) 9;
+        public static final int PSM_SINGLE_CHAR = (int) 10;
+        public static final int PSM_COUNT = (int) 11;
+    };
+
+    /**
+     * Enum of the elements of the page hierarchy, used in
+     * <code>ResultIterator</code> to provide functions that operate on each
+     * level without having to have 5x as many functions.
+     */
+    public static interface TessPageIteratorLevel {
+
+        public static final int RIL_BLOCK = (int) 0;
+        public static final int RIL_PARA = (int) 1;
+        public static final int RIL_TEXTLINE = (int) 2;
+        public static final int RIL_WORD = (int) 3;
+        public static final int RIL_SYMBOL = (int) 4;
+    };
+
+    public static interface TessPolyBlockType {
+
+        public static final int PT_UNKNOWN = (int) 0;
+        public static final int PT_FLOWING_TEXT = (int) 1;
+        public static final int PT_HEADING_TEXT = (int) 2;
+        public static final int PT_PULLOUT_TEXT = (int) 3;
+        public static final int PT_TABLE = (int) 4;
+        public static final int PT_VERTICAL_TEXT = (int) 5;
+        public static final int PT_CAPTION_TEXT = (int) 6;
+        public static final int PT_FLOWING_IMAGE = (int) 7;
+        public static final int PT_HEADING_IMAGE = (int) 8;
+        public static final int PT_PULLOUT_IMAGE = (int) 9;
+        public static final int PT_HORZ_LINE = (int) 10;
+        public static final int PT_VERT_LINE = (int) 11;
+        public static final int PT_NOISE = (int) 12;
+        public static final int PT_COUNT = (int) 13;
+    };
+
+    /**
+     * <pre>
+     *  +------------------+
+     *  | 1 Aaaa Aaaa Aaaa |
+     *  | Aaa aa aaa aa    |
+     *  | aaaaaa A aa aaa. |
+     *  |                2 |
+     *  |   #######  c c C |
+     *  |   #######  c c c |
+     *  | < #######  c c c |
+     *  | < #######  c   c |
+     *  | < #######  .   c |
+     *  | 3 #######      c |
+     *  +------------------+
+     * </pre>
+     * Orientation Example:<br />
+     * ====================<br />
+     * Above is a
+     * diagram of some (1) English and (2) Chinese text and a (3) photo
+     * credit.<br />
+     * <br />
+     * Upright Latin characters are represented as A and a. '<' represents
+     * a latin character rotated anti-clockwise 90 degrees. Upright
+     * Chinese characters are represented C and c.<br />
+     * <br />
+     * NOTA BENE: enum values here should match goodoc.proto<br />
+     * <br />
+     * If you orient your head so that "up" aligns with Orientation, then
+     * the characters will appear "right side up" and readable.<br />
+     * <br />
+     * In the example above, both the
+     * English and Chinese paragraphs are oriented so their "up" is the top of
+     * the page (page up). The photo credit is read with one's head turned
+     * leftward ("up" is to page left).<br />
+     * <br /> The values of this enum
+     * match the convention of Tesseract's osdetect.h
+     */
+    public static interface TessOrientation {
+
+        public static final int ORIENTATION_PAGE_UP = (int) 0;
+        public static final int ORIENTATION_PAGE_RIGHT = (int) 1;
+        public static final int ORIENTATION_PAGE_DOWN = (int) 2;
+        public static final int ORIENTATION_PAGE_LEFT = (int) 3;
+    };
+
+    /**
+     * The grapheme clusters within a line of text are laid out logically in
+     * this direction, judged when looking at the text line rotated so that its
+     * Orientation is "page up".<br /> <br /> For English text, the writing
+     * direction is left-to-right. For the Chinese text in the above example,
+     * the writing direction is top-to-bottom.
+     */
+    public static interface TessWritingDirection {
+
+        public static final int WRITING_DIRECTION_LEFT_TO_RIGHT = (int) 0;
+        public static final int WRITING_DIRECTION_RIGHT_TO_LEFT = (int) 1;
+        public static final int WRITING_DIRECTION_TOP_TO_BOTTOM = (int) 2;
+    };
+
+    /**
+     * The text lines are read in the given sequence.<br /> <br /> In English,
+     * the order is top-to-bottom. In Chinese, vertical text lines are read
+     * right-to-left. Mongolian is written in vertical columns top to bottom
+     * like Chinese, but the lines order left-to right.<br /> <br /> Note that
+     * only some combinations make sense. For example,
+     * <code>WRITING_DIRECTION_LEFT_TO_RIGHT</code> implies
+     * <code>TEXTLINE_ORDER_TOP_TO_BOTTOM</code>.
+     */
+    public static interface TessTextlineOrder {
+
+        public static final int TEXTLINE_ORDER_LEFT_TO_RIGHT = (int) 0;
+        public static final int TEXTLINE_ORDER_RIGHT_TO_LEFT = (int) 1;
+        public static final int TEXTLINE_ORDER_TOP_TO_BOTTOM = (int) 2;
+    };
+    public static final int TRUE = (int) 1;
+    public static final int FALSE = (int) 0;
+
+    /**
+     * Returns the version identifier.
+     */
+    String TessVersion();
+    
+    void TessDeleteText(Pointer text);
+
+    void TessDeleteTextArray(PointerByReference arr);
+
+    void TessDeleteIntArray(IntBuffer arr);
+    
+    /**
+     * Creates an instance of the base class for all Tesseract APIs.
+     */
+    TessAPI.TessBaseAPI TessBaseAPICreate();
+
+    /**
+     * Disposes the TesseractAPI instance.
+     */
+    void TessBaseAPIDelete(TessAPI.TessBaseAPI handle);
+
+    /**
+     * Set the name of the input file. Needed only for training and reading a
+     * UNLV zone file.
+     */
+    void TessBaseAPISetInputName(TessAPI.TessBaseAPI handle, String name);
+
+    /**
+     * Set the name of the bonus output files. Needed only for debugging.
+     */
+    void TessBaseAPISetOutputName(TessAPI.TessBaseAPI handle, String name);
+
+    /**
+     * Set the value of an internal "parameter." Supply the name of the
+     * parameter and the value as a string, just as you would in a config file.
+     * Returns false if the name lookup failed. E.g.,
+     * <code>SetVariable("tessedit_char_blacklist", "xyz");</code> to ignore x,
+     * y and z. Or
+     * <code>SetVariable("classify_bln_numeric_mode", "1");</code> to set
+     * numeric-only mode.
+     * <code>SetVariable</code> may be used before
+     * <code>Init</code>, but settings will revert to defaults on
+     * <code>End()</code>.<br /> <br /> Note: Must be called after
+     * <code>Init()</code>. Only works for non-init variables (init variables
+     * should be passed to
+     * <code>Init()</code>).
+     */
+    int TessBaseAPISetVariable(TessAPI.TessBaseAPI handle, String name, String value);
+
+    /**
+     * Returns true (1) if the parameter was found among Tesseract parameters.
+     * Fills in value with the value of the parameter.
+     */
+    int TessBaseAPIGetIntVariable(TessAPI.TessBaseAPI handle, String name, IntBuffer value);
+
+    int TessBaseAPIGetBoolVariable(TessAPI.TessBaseAPI handle, String name, IntBuffer value);
+
+    int TessBaseAPIGetDoubleVariable(TessAPI.TessBaseAPI handle, String name, DoubleBuffer value);
+
+    String TessBaseAPIGetStringVariable(TessAPI.TessBaseAPI handle, String name);
+
+    /**
+     * Print Tesseract parameters to the given file.<br /> <br /> Note: Must not
+     * be the first method called after instance create.
+     */
+    void TessBaseAPIPrintVariablesToFile(TessAPI.TessBaseAPI handle, String filename);
+
+    /**
+     * Instances are now mostly thread-safe and totally independent, but some
+     * global parameters remain. Basically it is safe to use multiple
+     * TessBaseAPIs in different threads in parallel, UNLESS: you use
+     * <code>SetVariable</code> on some of the Params in classify and textord.
+     * If you do, then the effect will be to change it for all your
+     * instances.<br /> <br /> Start tesseract. Returns zero on success and -1
+     * on failure. NOTE that the only members that may be called before Init are
+     * those listed above here in the class definition.<br /> <br /> The
+     * <code>datapath</code> must be the name of the parent directory of
+     * tessdata and must end in / . Any name after the last / will be stripped.
+     * The language is (usually) an
+     * <code>ISO 639-3</code> string or
+     * <code>NULL</code> will default to eng. It is entirely safe (and
+     * eventually will be efficient too) to call Init multiple times on the same
+     * instance to change language, or just to reset the classifier. The
+     * language may be a string of the form [~]<lang>[+[~]<lang>]* indicating
+     * that multiple languages are to be loaded. E.g., hin+eng will load Hindi
+     * and English. Languages may specify internally that they want to be loaded
+     * with one or more other languages, so the ~ sign is available to override
+     * that. E.g., if hin were set to load eng by default, then hin+~eng would
+     * force loading only hin. The number of loaded languages is limited only by
+     * memory, with the caveat that loading additional languages will impact
+     * both speed and accuracy, as there is more work to do to decide on the
+     * applicable language, and there is more chance of hallucinating incorrect
+     * words. WARNING: On changing languages, all Tesseract parameters are reset
+     * back to their default values. (Which may vary between languages.) If you
+     * have a rare need to set a Variable that controls initialization for a
+     * second call to
+     * <code>Init</code> you should explicitly call
+     * <code>End()</code> and then use
+     * <code>SetVariable</code> before
+     * <code>Init</code>. This is only a very rare use case, since there are
+     * very few uses that require any parameters to be set before
+     * <code>Init</code>.<br /> <br /> If
+     * <code>set_only_non_debug_params</code> is true, only params that do not
+     * contain "debug" in the name will be set.
+     */
+    int TessBaseAPIInit1(TessAPI.TessBaseAPI handle, String datapath, String language, int oem, PointerByReference configs, int configs_size);
+
+    int TessBaseAPIInit2(TessAPI.TessBaseAPI handle, String datapath, String language, int oem);
+
+    int TessBaseAPIInit3(TessAPI.TessBaseAPI handle, String datapath, String language);
+
+    /**
+     * Returns the languages string used in the last valid initialization. If
+     * the last initialization specified "deu+hin" then that will be returned.
+     * If hin loaded eng automatically as well, then that will not be included
+     * in this list. To find the languages actually loaded, use
+     * <code>GetLoadedLanguagesAsVector</code>. The returned string should NOT
+     * be deleted.
+     */
+    String TessBaseAPIGetInitLanguagesAsString(TessAPI.TessBaseAPI handle);
+
+    /**
+     * Returns the loaded languages in the vector of STRINGs. Includes all
+     * languages loaded by the last
+     * <code>Init</code>, including those loaded as dependencies of other loaded
+     * languages.
+     */
+    PointerByReference TessBaseAPIGetLoadedLanguagesAsVector(TessAPI.TessBaseAPI handle);
+
+    /**
+     * Returns the available languages in the vector of STRINGs.
+     */
+    PointerByReference TessBaseAPIGetAvailableLanguagesAsVector(TessAPI.TessBaseAPI handle);
+
+    /**
+     * Init only the lang model component of Tesseract. The only functions that
+     * work after this init are
+     * <code>SetVariable</code> and
+     * <code>IsValidWord</code>. WARNING: temporary! This function will be
+     * removed from here and placed in a separate API at some future time.
+     */
+    int TessBaseAPIInitLangMod(TessAPI.TessBaseAPI handle, String datapath, String language);
+
+    /**
+     * Init only for page layout analysis. Use only for calls to
+     * <code>SetImage</code> and
+     * <code>AnalysePage</code>. Calls that attempt recognition will generate an
+     * error.
+     */
+    void TessBaseAPIInitForAnalysePage(TessAPI.TessBaseAPI handle);
+
+    /**
+     * Read a "config" file containing a set of param, value pairs. Searches the
+     * standard places:
+     * <code>tessdata/configs</code>,
+     * <code>tessdata/tessconfigs</code> and also accepts a relative or absolute
+     * path name. Note: only non-init params will be set (init params are set by
+     * <code>Init()</code>).
+     */
+    void TessBaseAPIReadConfigFile(TessAPI.TessBaseAPI handle, String filename, int init_only);
+
+    /**
+     * Set the current page segmentation mode. Defaults to PSM_SINGLE_BLOCK. The
+     * mode is stored as an IntParam so it can also be modified by
+     * <code>ReadConfigFile</code> or
+     * <code>SetVariable("tessedit_pageseg_mode", mode as string)</code>.
+     */
+    void TessBaseAPISetPageSegMode(TessAPI.TessBaseAPI handle, int mode);
+
+    /**
+     * Return the current page segmentation mode.
+     */
+    int TessBaseAPIGetPageSegMode(TessAPI.TessBaseAPI handle);
+
+    /**
+     * Recognize a rectangle from an image and return the result as a string.
+     * May be called many times for a single
+     * <code>Init</code>. Currently has no error checking. Greyscale of 8 and
+     * color of 24 or 32 bits per pixel may be given. Palette color images will
+     * not work properly and must be converted to 24 bit. Binary images of 1 bit
+     * per pixel may also be given but they must be byte packed with the MSB of
+     * the first byte being the first pixel, and a 1 represents WHITE. For
+     * binary images set bytes_per_pixel=0. The recognized text is returned as a
+     * char* which is coded as UTF8 and must be freed with the delete []
+     * operator.<br /> <br /> Note that
+     * <code>TesseractRect</code> is the simplified convenience interface. For
+     * advanced uses, use
+     * <code>SetImage</code>, (optionally)
+     * <code>SetRectangle</code>,
+     * <code>Recognize</code>, and one or more of the
+     * <code>Get*Text</code> functions below.
+     */
+    Pointer TessBaseAPIRect(TessAPI.TessBaseAPI handle, ByteBuffer imagedata, int bytes_per_pixel, int bytes_per_line, int left, int top, int width, int height);
+
+    /**
+     * Call between pages or documents etc to free up memory and forget adaptive
+     * data.
+     */
+    void TessBaseAPIClearAdaptiveClassifier(TessAPI.TessBaseAPI handle);
+
+    /**
+     * Provide an image for Tesseract to recognize. Format is as TesseractRect
+     * above. Does not copy the image buffer, or take ownership. The source
+     * image may be destroyed after Recognize is called, either explicitly or
+     * implicitly via one of the
+     * <code>Get*Text</code> functions.
+     * <code>SetImage</code> clears all recognition results, and sets the
+     * rectangle to the full image, so it may be followed immediately by a
+     * <code>GetUTF8Text</code>, and it will automatically perform recognition.
+     */
+    void TessBaseAPISetImage(TessAPI.TessBaseAPI handle, ByteBuffer imagedata, int width, int height, int bytes_per_pixel, int bytes_per_line);
+
+    /**
+     * Set the resolution of the source image in pixels per inch so font size
+     * information can be calculated in results. Call this after SetImage().
+     */
+    void TessBaseAPISetSourceResolution(TessAPI.TessBaseAPI handle, int ppi);
+
+    /**
+     * Restrict recognition to a sub-rectangle of the image. Call after
+     * <code>SetImage</code>. Each
+     * <code>SetRectangle</code> clears the recognition results so multiple
+     * rectangles can be recognized with the same image.
+     */
+    void TessBaseAPISetRectangle(TessAPI.TessBaseAPI handle, int left, int top, int width, int height);
+
+    /** Scale factor from original image. */
+    int TessBaseAPIGetThresholdedImageScaleFactor(TessAPI.TessBaseAPI handle);
+
+    /** Dump the internal binary image to a PGM file. */
+    void TessBaseAPIDumpPGM(TessAPI.TessBaseAPI handle, String filename);
+                
+    /**
+     * Runs page layout analysis in the mode set by SetPageSegMode. May
+     * optionally be called prior to Recognize to get access to just the page
+     * layout results. Returns an iterator to the results. Returns NULL on
+     * error. The returned iterator must be deleted after use. WARNING! This
+     * class points to data held within the TessBaseAPI class, and therefore can
+     * only be used while the TessBaseAPI class still exists and has not been
+     * subjected to a call of
+     * <code>Init</code>,
+     * <code>SetImage</code>,
+     * <code>Recognize</code>,
+     * <code>Clear</code>,
+     * <code>End</code>, DetectOS, or anything else that changes the internal
+     * PAGE_RES.
+     */
+    TessAPI.TessPageIterator TessBaseAPIAnalyseLayout(TessAPI.TessBaseAPI handle);
+
+    /**
+     * Recognize the image from SetAndThresholdImage, generating Tesseract
+     * internal structures. Returns 0 on success. Optional. The
+     * <code>Get*Text</code> functions below will call
+     * <code>Recognize</code> if needed. After Recognize, the output is kept
+     * internally until the next
+     * <code>SetImage</code>.
+     */
+    int TessBaseAPIRecognize(TessAPI.TessBaseAPI handle, TessAPI.ETEXT_DESC monitor);
+
+    /**
+     * Variant on Recognize used for testing chopper.
+     */
+    int TessBaseAPIRecognizeForChopTest(TessAPI.TessBaseAPI handle, TessAPI.ETEXT_DESC monitor);
+
+    /**
+     * Get a reading-order iterator to the results of LayoutAnalysis and/or
+     * Recognize. The returned iterator must be deleted after use. WARNING! This
+     * class points to data held within the TessBaseAPI class, and therefore can
+     * only be used while the TessBaseAPI class still exists and has not been
+     * subjected to a call of
+     * <code>Init</code>,
+     * <code>SetImage</code>,
+     * <code>Recognize</code>,
+     * <code>Clear</code>,
+     * <code>End</code>, DetectOS, or anything else that changes the internal
+     * PAGE_RES.
+     */
+    TessAPI.TessResultIterator TessBaseAPIGetIterator(TessAPI.TessBaseAPI handle);
+    
+   /**
+    * Get a mutable iterator to the results of LayoutAnalysis and/or Recognize.
+    * The returned iterator must be deleted after use.
+    * WARNING! This class points to data held within the TessBaseAPI class, and
+    * therefore can only be used while the TessBaseAPI class still exists and
+    * has not been subjected to a call of Init, SetImage, Recognize, Clear, End
+    * DetectOS, or anything else that changes the internal PAGE_RES.
+    */
+    TessAPI.TessMutableIterator TessBaseAPIGetMutableIterator(TessAPI.TessBaseAPI handle);
+
+    /**
+     * Recognizes all the pages in the named file, as a multi-page tiff or list
+     * of filenames, or single image, and gets the appropriate kind of text
+     * according to parameters:
+     * <code>tessedit_create_boxfile</code>,
+     * <code>tessedit_make_boxes_from_boxes</code>,
+     * <code>tessedit_write_unlv</code>,
+     * <code>tessedit_create_hocr</code>. Calls ProcessPage on each page in the
+     * input file, which may be a multi-page tiff, single-page other file
+     * format, or a plain text list of images to read. If tessedit_page_number
+     * is non-negative, processing begins at that page of a multi-page tiff
+     * file, or filelist. The text is returned in text_out. Returns false on
+     * error. If non-zero timeout_millisec terminates processing after the
+     * timeout on a single page. If non-NULL and non-empty, and some page fails
+     * for some reason, the page is reprocessed with the retry_config config
+     * file. Useful for interactively debugging a bad page.
+     */
+    Pointer TessBaseAPIProcessPages(TessAPI.TessBaseAPI handle, String filename, String retry_config, int timeout_millisec);
+
+    /**
+     * The recognized text is returned as a char* which is coded as UTF-8 and
+     * must be freed with the delete [] operator.
+     */
+    Pointer TessBaseAPIGetUTF8Text(TessAPI.TessBaseAPI handle);
+
+    /**
+     * Make a HTML-formatted string with hOCR markup from the internal data
+     * structures. page_number is 0-based but will appear in the output as
+     * 1-based.
+     */
+    Pointer TessBaseAPIGetHOCRText(TessAPI.TessBaseAPI handle, int page_number);
+
+    /**
+     * The recognized text is returned as a char* which is coded in the same
+     * format as a box file used in training. Returned string must be freed with
+     * the delete [] operator. Constructs coordinates in the original image -
+     * not just the rectangle. page_number is a 0-based page index that will
+     * appear in the box file.
+     */
+    Pointer TessBaseAPIGetBoxText(TessAPI.TessBaseAPI handle, int page_number);
+
+    /**
+     * The recognized text is returned as a char* which is coded as UNLV format
+     * Latin-1 with specific reject and suspect codes and must be freed with the
+     * delete [] operator.
+     */
+    Pointer TessBaseAPIGetUNLVText(TessAPI.TessBaseAPI handle);
+
+    /**
+     * Returns the (average) confidence value between 0 and 100.
+     */
+    int TessBaseAPIMeanTextConf(TessAPI.TessBaseAPI handle);
+
+    /**
+     * Returns all word confidences (between 0 and 100) in an array, terminated
+     * by -1. The calling function must delete [] after use. The number of
+     * confidences should correspond to the number of space-delimited words in
+     * GetUTF8Text.
+     */
+    IntByReference TessBaseAPIAllWordConfidences(TessAPI.TessBaseAPI handle);
+
+    /**
+     * Applies the given word to the adaptive classifier if possible. The word
+     * must be SPACE-DELIMITED UTF-8 - l i k e t h i s , so it can tell the
+     * boundaries of the graphemes. Assumes that SetImage/SetRectangle have been
+     * used to set the image to the given word. The mode arg should be
+     * PSM_SINGLE_WORD or PSM_CIRCLE_WORD, as that will be used to control
+     * layout analysis. The currently set PageSegMode is preserved. Returns
+     * false if adaption was not possible for some reason.
+     */
+    int TessBaseAPIAdaptToWordStr(TessAPI.TessBaseAPI handle, int mode, String wordstr);
+
+    /**
+     * Free up recognition results and any stored image data, without actually
+     * freeing any recognition data that would be time-consuming to reload.
+     * Afterwards, you must call
+     * <code>SetImage</code> or
+     * <code>TesseractRect</code> before doing any
+     * <code>Recognize</code> or
+     * <code>Get*</code> operation.
+     */
+    void TessBaseAPIClear(TessAPI.TessBaseAPI handle);
+
+    /**
+     * Close down tesseract and free up all memory.
+     * <code>End()</code> is equivalent to destructing and reconstructing your
+     * TessBaseAPI. Once
+     * <code>End()</code> has been used, none of the other API functions may be
+     * used other than
+     * <code>Init</code> and anything declared above it in the class definition.
+     */
+    void TessBaseAPIEnd(TessAPI.TessBaseAPI handle);
+
+    /**
+     * Check whether a word is valid according to Tesseract's language model.
+     *
+     * @return 0 if the word is invalid, non-zero if valid. @warning temporary!
+     * This function will be removed from here and placed in a separate API at
+     * some future time.
+     */
+    int TessBaseAPIIsValidWord(TessAPI.TessBaseAPI handle, String word);
+
+    int TessBaseAPIGetTextDirection(TessAPI.TessBaseAPI handle, IntBuffer out_offset, FloatBuffer out_slope);
+
+    /**
+     * This method returns the string form of the specified unichar.
+     */
+    String TessBaseAPIGetUnichar(TessAPI.TessBaseAPI handle, int unichar_id);
+
+    /* Page iterator */
+    void TessPageIteratorDelete(TessAPI.TessPageIterator handle);
+
+    TessAPI.TessPageIterator TessPageIteratorCopy(TessAPI.TessPageIterator handle);
+
+    void TessPageIteratorBegin(TessAPI.TessPageIterator handle);
+
+    int TessPageIteratorNext(TessAPI.TessPageIterator handle, int level);
+
+    int TessPageIteratorIsAtBeginningOf(TessAPI.TessPageIterator handle, int level);
+
+    int TessPageIteratorIsAtFinalElement(TessAPI.TessPageIterator handle, int level, int element);
+
+    int TessPageIteratorBoundingBox(TessAPI.TessPageIterator handle, int level, IntBuffer left, IntBuffer top, IntBuffer right, IntBuffer bottom);
+
+    int TessPageIteratorBlockType(TessAPI.TessPageIterator handle);
+
+    int TessPageIteratorBaseline(TessAPI.TessPageIterator handle, int level, IntBuffer x1, IntBuffer y1, IntBuffer x2, IntBuffer y2);
+
+    void TessPageIteratorOrientation(TessAPI.TessPageIterator handle, IntBuffer orientation, IntBuffer writing_direction, IntBuffer textline_order, FloatBuffer deskew_angle);
+
+    /* Result iterator */
+    void TessResultIteratorDelete(TessAPI.TessResultIterator handle);
+
+    TessAPI.TessResultIterator TessResultIteratorCopy(TessAPI.TessResultIterator handle);
+
+    TessAPI.TessPageIterator TessResultIteratorGetPageIterator(TessAPI.TessResultIterator handle);
+
+    TessAPI.TessPageIterator TessResultIteratorGetPageIteratorConst(TessAPI.TessResultIterator handle);
+
+    Pointer TessResultIteratorGetUTF8Text(TessAPI.TessResultIterator handle, int level);
+
+    float TessResultIteratorConfidence(TessAPI.TessResultIterator handle, int level);
+
+    String TessResultIteratorWordFontAttributes(TessAPI.TessResultIterator handle, IntBuffer is_bold, IntBuffer is_italic, IntBuffer is_underlined, IntBuffer is_monospace, IntBuffer is_serif, IntBuffer is_smallcaps, IntBuffer pointsize, IntBuffer font_id);
+
+    int TessResultIteratorWordIsFromDictionary(TessAPI.TessResultIterator handle);
+
+    int TessResultIteratorWordIsNumeric(TessAPI.TessResultIterator handle);
+
+    int TessResultIteratorSymbolIsSuperscript(TessAPI.TessResultIterator handle);
+
+    int TessResultIteratorSymbolIsSubscript(TessAPI.TessResultIterator handle);
+
+    int TessResultIteratorSymbolIsDropcap(TessAPI.TessResultIterator handle);
+
+    public static class TessBaseAPI extends PointerType {
+
+        public TessBaseAPI(Pointer address) {
+            super(address);
+        }
+
+        public TessBaseAPI() {
+            super();
+        }
+    };
+
+    public static class ETEXT_DESC extends PointerType {
+
+        public ETEXT_DESC(Pointer address) {
+            super(address);
+        }
+
+        public ETEXT_DESC() {
+            super();
+        }
+    };
+
+    public static class TessPageIterator extends PointerType {
+
+        public TessPageIterator(Pointer address) {
+            super(address);
+        }
+
+        public TessPageIterator() {
+            super();
+        }
+    };
+    
+    public static class TessMutableIterator extends PointerType {
+
+        public TessMutableIterator(Pointer address) {
+            super(address);
+        }
+
+        public TessMutableIterator() {
+            super();
+        }
+    };
+    
+    public static class TessResultIterator extends PointerType {
+
+        public TessResultIterator(Pointer address) {
+            super(address);
+        }
+
+        public TessResultIterator() {
+            super();
+        }
+    };
+}

docs-core/src/main/java/net/sourceforge/tess4j/Tesseract.java

@@ -0,0 +1,258 @@
+/**
+ * Copyright @ 2012 Quan Nguyen
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package net.sourceforge.tess4j;
+
+import java.awt.Rectangle;
+import java.awt.image.BufferedImage;
+import java.awt.image.RenderedImage;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.util.ArrayList;
+import java.util.Enumeration;
+import java.util.List;
+import java.util.Properties;
+
+import javax.imageio.IIOImage;
+
+import net.sourceforge.vietocr.ImageIOHelper;
+
+import com.sun.jna.Pointer;
+
+/**
+ * An object layer on top of
+ * <code>TessAPI</code>, provides character recognition support for common image
+ * formats, and multi-page TIFF images beyond the uncompressed, binary TIFF
+ * format supported by Tesseract OCR engine. The extended capabilities are
+ * provided by the
+ * <code>Java Advanced Imaging Image I/O Tools</code>. <br /><br /> Support for
+ * PDF documents is available through
+ * <code>Ghost4J</code>, a
+ * <code>JNA</code> wrapper for
+ * <code>GPL Ghostscript</code>, which should be installed and included in
+ * system path. <br /><br /> Any program that uses the library will need to
+ * ensure that the required libraries (the
+ * <code>.jar</code> files for
+ * <code>jna</code>,
+ * <code>jai-imageio</code>, and
+ * <code>ghost4j</code>) are in its compile and run-time
+ * <code>classpath</code>.
+ */
+public class Tesseract {
+
+    private static Tesseract instance;
+    private final static Rectangle EMPTY_RECTANGLE = new Rectangle();
+    private String language = "eng";
+    private String datapath = "tessdata";
+    private int psm = TessAPI.TessPageSegMode.PSM_AUTO;
+    private boolean hocr;
+    private int pageNum;
+    private int ocrEngineMode = TessAPI.TessOcrEngineMode.OEM_DEFAULT;
+    private Properties prop = new Properties();
+    public final static String htmlBeginTag =
+            "<!DOCTYPE html PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\""
+            + " \"http://www.w3.org/TR/html4/loose.dtd\">\n"
+            + "<html>\n<head>\n<title></title>\n"
+            + "<meta http-equiv=\"Content-Type\" content=\"text/html;"
+            + "charset=utf-8\" />\n<meta name='ocr-system' content='tesseract'/>\n"
+            + "</head>\n<body>\n";
+    public final static String htmlEndTag = "</body>\n</html>\n";
+
+    /**
+     * Private constructor.
+     */
+    private Tesseract() {
+        System.setProperty("jna.encoding", "UTF8");
+    }
+
+    /**
+     * Gets an instance of the class library.
+     *
+     * @return instance
+     */
+    public static synchronized Tesseract getInstance() {
+        if (instance == null) {
+            instance = new Tesseract();
+        }
+
+        return instance;
+    }
+
+    /**
+     * Sets tessdata path.
+     *
+     * @param datapath the tessdata path to set
+     */
+    public void setDatapath(String datapath) {
+        this.datapath = datapath;
+    }
+
+    /**
+     * Sets language for OCR.
+     *
+     * @param language the language code, which follows ISO 639-3 standard.
+     */
+    public void setLanguage(String language) {
+        this.language = language;
+    }
+
+    /**
+     * Sets OCR engine mode.
+     *
+     * @param ocrEngineMode the OcrEngineMode to set
+     */
+    public void setOcrEngineMode(int ocrEngineMode) {
+        this.ocrEngineMode = ocrEngineMode;
+    }
+
+    /**
+     * Sets page segmentation mode.
+     *
+     * @param mode the page segmentation mode to set
+     */
+    public void setPageSegMode(int mode) {
+        this.psm = mode;
+    }
+
+    /**
+     * Enables hocr output.
+     *
+     * @param hocr to enable or disable hocr output
+     */
+    public void setHocr(boolean hocr) {
+        this.hocr = hocr;
+        prop.setProperty("tessedit_create_hocr", hocr ? "1" : "0");
+    }
+
+    /**
+     * Set the value of Tesseract's internal parameter.
+     *
+     * @param key variable name, e.g.,
+     * <code>tessedit_create_hocr</code>,
+     * <code>tessedit_char_whitelist</code>, etc.
+     * @param value value for corresponding variable, e.g., "1", "0",
+     * "0123456789", etc.
+     */
+    public void setTessVariable(String key, String value) {
+        prop.setProperty(key, value);
+    }
+
+    /**
+     * Performs OCR operation.
+     *
+     * @param bi a buffered image
+     * @return the recognized text
+     * @throws TesseractException
+     */
+    public String doOCR(BufferedImage bi) throws TesseractException {
+        return doOCR(bi, null);
+    }
+
+    /**
+     * Performs OCR operation.
+     *
+     * @param bi a buffered image
+     * @param rect the bounding rectangle defines the region of the image to be
+     * recognized. A rectangle of zero dimension or
+     * <code>null</code> indicates the whole image.
+     * @return the recognized text
+     * @throws TesseractException
+     */
+    public String doOCR(BufferedImage bi, Rectangle rect) throws TesseractException {
+        IIOImage oimage = new IIOImage(bi, null, null);
+        List<IIOImage> imageList = new ArrayList<IIOImage>();
+        imageList.add(oimage);
+        return doOCR(imageList, rect);
+    }
+
+    /**
+     * Performs OCR operation.
+     *
+     * @param imageList a list of
+     * <code>IIOImage</code> objects
+     * @param rect the bounding rectangle defines the region of the image to be
+     * recognized. A rectangle of zero dimension or
+     * <code>null</code> indicates the whole image.
+     * @return the recognized text
+     * @throws TesseractException
+     */
+    public String doOCR(List<IIOImage> imageList, Rectangle rect) throws TesseractException {
+        StringBuilder sb = new StringBuilder();
+        pageNum = 0;
+
+        for (IIOImage oimage : imageList) {
+            pageNum++;
+            try {
+                ByteBuffer buf = ImageIOHelper.getImageByteBuffer(oimage);
+                RenderedImage ri = oimage.getRenderedImage();
+                String pageText = doOCR(ri.getWidth(), ri.getHeight(), buf, rect, ri.getColorModel().getPixelSize());
+                sb.append(pageText);
+            } catch (IOException ioe) {
+                //skip the problematic image
+                System.err.println(ioe.getMessage());
+            }
+        }
+
+        if (hocr) {
+            sb.insert(0, htmlBeginTag).append(htmlEndTag);
+        }
+        return sb.toString();
+    }
+
+    /**
+     * Performs OCR operation. Use
+     * <code>SetImage</code>, (optionally)
+     * <code>SetRectangle</code>, and one or more of the
+     * <code>Get*Text</code> functions.
+     *
+     * @param xsize width of image
+     * @param ysize height of image
+     * @param buf pixel data
+     * @param rect the bounding rectangle defines the region of the image to be
+     * recognized. A rectangle of zero dimension or
+     * <code>null</code> indicates the whole image.
+     * @param bpp bits per pixel, represents the bit depth of the image, with 1
+     * for binary bitmap, 8 for gray, and 24 for color RGB.
+     * @return the recognized text
+     * @throws TesseractException
+     */
+    public String doOCR(int xsize, int ysize, ByteBuffer buf, Rectangle rect, int bpp) throws TesseractException {
+        TessAPI api = TessAPI.INSTANCE;
+        TessAPI.TessBaseAPI handle = api.TessBaseAPICreate();
+        api.TessBaseAPIInit2(handle, datapath, language, ocrEngineMode);
+        api.TessBaseAPISetPageSegMode(handle, psm);
+        
+        Enumeration<?> em = prop.propertyNames();
+        while (em.hasMoreElements()) {
+            String key = (String) em.nextElement();
+            api.TessBaseAPISetVariable(handle, key, prop.getProperty(key));
+        }
+
+        int bytespp = bpp / 8;
+        int bytespl = (int) Math.ceil(xsize * bpp / 8.0);
+        api.TessBaseAPISetImage(handle, buf, xsize, ysize, bytespp, bytespl);
+
+        if (rect != null && !rect.equals(EMPTY_RECTANGLE)) {
+            api.TessBaseAPISetRectangle(handle, rect.x, rect.y, rect.width, rect.height);
+        }
+
+        Pointer utf8Text = hocr ? api.TessBaseAPIGetHOCRText(handle, pageNum - 1) : api.TessBaseAPIGetUTF8Text(handle);
+        String str = utf8Text.getString(0);
+        api.TessDeleteText(utf8Text);
+        api.TessBaseAPIDelete(handle);
+        
+        return str;
+    }
+}

docs-core/src/main/java/net/sourceforge/tess4j/TesseractException.java

@@ -0,0 +1,38 @@
+/**
+ * Copyright @ 2010 Quan Nguyen
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.sourceforge.tess4j;
+
+public class TesseractException extends Exception {
+
+    private static final long serialVersionUID = 1L;
+
+    public TesseractException() {
+        super();
+    }
+
+    public TesseractException(String message) {
+        super(message);
+    }
+
+    public TesseractException(Throwable cause) {
+        super(cause);
+    }
+
+    public TesseractException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}

docs-core/src/main/java/net/sourceforge/vietocr/ImageHelper.java

@@ -0,0 +1,173 @@
+/**
+ * Copyright @ 2008 Quan Nguyen
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package net.sourceforge.vietocr;
+
+import java.awt.Graphics2D;
+import java.awt.Image;
+import java.awt.RenderingHints;
+import java.awt.Toolkit;
+import java.awt.Transparency;
+import java.awt.datatransfer.Clipboard;
+import java.awt.datatransfer.DataFlavor;
+import java.awt.image.*;
+
+public class ImageHelper {
+
+    /**
+     * Convenience method that returns a scaled instance of the provided
+     * {@code BufferedImage}.
+     *
+     * @param image the original image to be scaled
+     * @param targetWidth the desired width of the scaled instance, in pixels
+     * @param targetHeight the desired height of the scaled instance, in pixels
+     * @return a scaled version of the original {@code BufferedImage}
+     */
+    public static BufferedImage getScaledInstance(BufferedImage image, int targetWidth, int targetHeight) {
+        int type = (image.getTransparency() == Transparency.OPAQUE)
+                ? BufferedImage.TYPE_INT_RGB : BufferedImage.TYPE_INT_ARGB;
+        BufferedImage tmp = new BufferedImage(targetWidth, targetHeight, type);
+        Graphics2D g2 = tmp.createGraphics();
+        g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
+        g2.drawImage(image, 0, 0, targetWidth, targetHeight, null);
+        g2.dispose();
+        return tmp;
+    }
+
+    /**
+     * A replacement for the standard
+     * <code>BufferedImage.getSubimage</code> method.
+     *
+     * @param image
+     * @param x the X coordinate of the upper-left corner of the specified
+     * rectangular region
+     * @param y the Y coordinate of the upper-left corner of the specified
+     * rectangular region
+     * @param width the width of the specified rectangular region
+     * @param height the height of the specified rectangular region
+     * @return a BufferedImage that is the subimage of <code>image</code>.
+     */
+    public static BufferedImage getSubImage(BufferedImage image, int x, int y, int width, int height) {
+        int type = (image.getTransparency() == Transparency.OPAQUE)
+                ? BufferedImage.TYPE_INT_RGB : BufferedImage.TYPE_INT_ARGB;
+        BufferedImage tmp = new BufferedImage(width, height, type);
+        Graphics2D g2 = tmp.createGraphics();
+        g2.drawImage(image.getSubimage(x, y, width, height), 0, 0, null);
+        g2.dispose();
+        return tmp;
+    }
+
+    /**
+     * A simple method to convert an image to binary or B/W image.
+     *
+     * @param image input image
+     * @return a monochrome image
+     */
+    public static BufferedImage convertImageToBinary(BufferedImage image) {
+        BufferedImage tmp = new BufferedImage(image.getWidth(), image.getHeight(), BufferedImage.TYPE_BYTE_BINARY);
+        Graphics2D g2 = tmp.createGraphics();
+        g2.drawImage(image, 0, 0, null);
+        g2.dispose();
+        return tmp;
+    }
+    
+    /**
+     * A simple method to convert an image to binary or B/W image.
+     *
+     * @param image input image
+     * @return a monochrome image
+     * @deprecated  As of release 1.1, renamed to {@link #convertImageToBinary(BufferedImage image)}
+     */
+    @Deprecated
+    public static BufferedImage convertImage2Binary(BufferedImage image) {
+        return convertImageToBinary(image);
+    }
+    
+    /**
+     * A simple method to convert an image to gray scale.
+     *
+     * @param image input image
+     * @return a monochrome image
+     */
+    public static BufferedImage convertImageToGrayscale(BufferedImage image) {
+        BufferedImage tmp = new BufferedImage(image.getWidth(), image.getHeight(), BufferedImage.TYPE_BYTE_GRAY);
+        Graphics2D g2 = tmp.createGraphics();
+        g2.drawImage(image, 0, 0, null);
+        g2.dispose();
+        return tmp;
+    }
+    
+    private static final short[] invertTable;
+
+    static {
+        invertTable = new short[256];
+        for (int i = 0; i < 256; i++) {
+            invertTable[i] = (short) (255 - i);
+        }
+    }
+    
+    /**
+     * Inverts image color.
+     * 
+     * @param image input image
+     * @return an inverted-color image
+     */
+    public static BufferedImage invertImageColor(BufferedImage image) {
+        BufferedImage tmp = new BufferedImage(image.getWidth(), image.getHeight(), image.getType());
+        BufferedImageOp invertOp = new LookupOp(new ShortLookupTable(0, invertTable), null);
+        return invertOp.filter(image, tmp);
+    }
+
+    /**
+     * Rotates an image.
+     * 
+     * @param image the original image
+     * @param angle the degree of rotation
+     * @return a rotated image
+     */
+    public static BufferedImage rotateImage(BufferedImage image, double angle) {
+        double theta = Math.toRadians(angle);
+        double sin = Math.abs(Math.sin(theta));
+        double cos = Math.abs(Math.cos(theta));
+        int w = image.getWidth();
+        int h = image.getHeight();
+        int newW = (int) Math.floor(w * cos + h * sin);
+        int newH = (int) Math.floor(h * cos + w * sin);
+        
+        BufferedImage tmp = new BufferedImage(newW, newH, image.getType());
+        Graphics2D g2d = tmp.createGraphics();
+        g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
+                RenderingHints.VALUE_INTERPOLATION_BICUBIC);
+        g2d.translate((newW - w) / 2, (newH - h) / 2);
+        g2d.rotate(theta, w / 2, h / 2);
+        g2d.drawImage(image, 0, 0, null);
+        g2d.dispose();
+        return tmp;
+    }
+
+    /**
+     * Gets an image from Clipboard.
+     *
+     * @return image
+     */
+    public static Image getClipboardImage() {
+        Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
+        try {
+            return (Image) clipboard.getData(DataFlavor.imageFlavor);
+        } catch (Exception e) {
+            return null;
+        }
+    }
+}

docs-core/src/main/java/net/sourceforge/vietocr/ImageIOHelper.java

@@ -0,0 +1,128 @@
+/**
+ * Copyright @ 2008 Quan Nguyen
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package net.sourceforge.vietocr;
+
+import java.awt.Toolkit;
+import java.awt.image.BufferedImage;
+import java.awt.image.DataBufferByte;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.util.HashMap;
+import java.util.Locale;
+import java.util.Map;
+
+import javax.imageio.IIOImage;
+import javax.imageio.ImageIO;
+import javax.imageio.ImageWriteParam;
+import javax.imageio.ImageWriter;
+import javax.imageio.metadata.IIOMetadata;
+import javax.imageio.metadata.IIOMetadataNode;
+import javax.imageio.stream.ImageOutputStream;
+
+import org.w3c.dom.NodeList;
+
+import com.sun.media.imageio.plugins.tiff.TIFFImageWriteParam;
+import com.sun.media.imageioimpl.plugins.tiff.TIFFImageWriterSpi;
+
+public class ImageIOHelper {
+
+    final static String TIFF_FORMAT = "tiff";
+
+
+    /**
+     * Gets pixel data of an
+     * <code>IIOImage</code> object.
+     *
+     * @param image an
+     * <code>IIOImage</code> object
+     * @return a byte buffer of pixel data
+     * @throws Exception
+     */
+    public static ByteBuffer getImageByteBuffer(IIOImage image) throws IOException {
+        //Set up the writeParam
+        TIFFImageWriteParam tiffWriteParam = new TIFFImageWriteParam(Locale.US);
+        tiffWriteParam.setCompressionMode(ImageWriteParam.MODE_DISABLED);
+
+        //Get tif writer and set output to file
+        ImageWriter writer = new TIFFImageWriterSpi().createWriterInstance();
+
+        //Get the stream metadata
+        IIOMetadata streamMetadata = writer.getDefaultStreamMetadata(tiffWriteParam);
+
+        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+        ImageOutputStream ios = ImageIO.createImageOutputStream(outputStream);
+        writer.setOutput(ios);
+        writer.write(streamMetadata, new IIOImage(image.getRenderedImage(), null, null), tiffWriteParam);
+        writer.dispose();
+        ios.seek(0);
+        BufferedImage bi = ImageIO.read(ios);
+        return convertImageData(bi);
+    }
+
+    /**
+     * Converts <code>BufferedImage</code> to <code>ByteBuffer</code>.
+     * 
+     * @param bi Input image
+     * @return pixel data
+     */
+    public static ByteBuffer convertImageData(BufferedImage bi) {
+        byte[] pixelData = ((DataBufferByte) bi.getRaster().getDataBuffer()).getData();
+ //        return ByteBuffer.wrap(pixelData);
+        ByteBuffer buf = ByteBuffer.allocateDirect(pixelData.length);
+        buf.order(ByteOrder.nativeOrder());
+        buf.put(pixelData);
+        buf.flip();
+        return buf;
+    }
+
+    /**
+     * Reads image meta data.
+     *
+     * @param oimage
+     * @return a map of meta data
+     */
+    public static Map<String, String> readImageData(IIOImage oimage) {
+        Map<String, String> dict = new HashMap<String, String>();
+
+        IIOMetadata imageMetadata = oimage.getMetadata();
+        if (imageMetadata != null) {
+            IIOMetadataNode dimNode = (IIOMetadataNode) imageMetadata.getAsTree("javax_imageio_1.0");
+            NodeList nodes = dimNode.getElementsByTagName("HorizontalPixelSize");
+            int dpiX;
+            if (nodes.getLength() > 0) {
+                float dpcWidth = Float.parseFloat(nodes.item(0).getAttributes().item(0).getNodeValue());
+                dpiX = (int) Math.round(25.4f / dpcWidth);
+            } else {
+                dpiX = Toolkit.getDefaultToolkit().getScreenResolution();
+            }
+            dict.put("dpiX", String.valueOf(dpiX));
+
+            nodes = dimNode.getElementsByTagName("VerticalPixelSize");
+            int dpiY;
+            if (nodes.getLength() > 0) {
+                float dpcHeight = Float.parseFloat(nodes.item(0).getAttributes().item(0).getNodeValue());
+                dpiY = (int) Math.round(25.4f / dpcHeight);
+            } else {
+                dpiY = Toolkit.getDefaultToolkit().getScreenResolution();
+            }
+            dict.put("dpiY", String.valueOf(dpiY));
+        }
+
+        return dict;
+    }
+}

docs-parent/pom.xml

@@ -463,11 +463,6 @@
         <version>1.0</version>
       </dependency>
       
-      <dependency>
-        <groupId>tess4j</groupId>
-        <artifactId>tess4j</artifactId>
-        <version>1.0</version>
-      </dependency>
     </dependencies>
   </dependencyManagement>
   
@@ -531,23 +526,6 @@
                 </goals>
               </execution>
               
-              <execution>
-                <id>install-tess4j</id>
-                <phase>validate</phase>
-                <configuration>
-                  <file>${project.basedir}/lib/tess4j.jar</file>
-                  <repositoryLayout>default</repositoryLayout>
-                  <groupId>tess4j</groupId>
-                  <artifactId>tess4j</artifactId>
-                  <version>1.0</version>
-                  <packaging>jar</packaging>
-                  <generatePom>true</generatePom>
-                </configuration>
-                <goals>
-                  <goal>install-file</goal>
-                </goals>
-              </execution>
-              
             </executions>
           </plugin>
         </plugins>