Tess4j: Memory access error in tess4j java

问题

I am writing a program using tess4j.jar. The program is extracting text and its location from within an image. I get this error:

Exception in thread "main" java.lang.Error: Invalid memory access
at net.sourceforge.tess4j.TessAPI1.TessBaseAPIRecognize(Native Method)
at TesseractUtility.TessBoxForLogo.run(TessBoxForLogo.java:50)

The funny thing is that it does not appear for every image. Does anybody know where I have an error?

Here my code:

public static ArrayList<Info> run(String imageName, List<String[]> wordsToFind){
    int WayToGetInfo = TessAPI1.TessPageIteratorLevel.RIL_TEXTLINE;
    wordsToFind = ParsData.addAnomalie(wordsToFind);
    //Prepare lists
    ArrayList<Info> infos = new ArrayList<Info>();
    ArrayList<Rect> rectangles = new ArrayList<Rect>();

    //Buff image
    File imageFile = new File(imageName);
    BufferedImage image = null;
    ByteBuffer buf = null;
    int w = 0;
    int h = 0;
    try {
        image = ImageIO.read(new FileInputStream(imageFile));
        w = image.getWidth();
        h = image.getHeight();

        buf = ImageIOHelper.convertImageData(image);
    } catch (FileNotFoundException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    } catch (IOException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    } 

    //Get image dimensions
    int bpp = image.getColorModel().getPixelSize();
    int bytespp = bpp / 8;
    int bytespl = (int) Math.ceil(w * bytespp);

    //Tess4 preparation
    TessBaseAPI handler = TessAPI1.TessBaseAPICreate();
    String treiningDataPath = "C:\\Users\\Karmen\\Documents\\Bitbucket\\Podjetje\\lib\\Tess4J\\tessdata";
    String lang = "slv";
    TessAPI1.TessBaseAPIInit3(handler, treiningDataPath, lang);
    TessAPI1.TessBaseAPISetPageSegMode(handler, TessAPI1.TessPageSegMode.PSM_AUTO_ONLY);
    TessAPI1.TessBaseAPISetImage(handler, buf, w, h, bytespp, bytespl);

    TessAPI1.TessBaseAPIRecognize(handler, null);

    TessResultIterator ri = TessAPI1.TessBaseAPIGetIterator(handler);
    Pointer str = TessAPI1.TessResultIteratorGetUTF8Text(ri, WayToGetInfo);
    TessAPI1.TessPageIterator pi = TessAPI1.TessResultIteratorGetPageIterator(ri);
    TessAPI1.TessPageIteratorBegin(pi);

    //Iterate thru rows
    while (TessAPI1.TessPageIteratorNext(pi,WayToGetInfo) == TessAPI1.TRUE){
        str = TessAPI1.TessResultIteratorGetUTF8Text(ri, WayToGetInfo);
        if (str!=null){
            float confidence = TessAPI1.TessResultIteratorConfidence(ri, WayToGetInfo);
            String word = str.getString(0);
            IntBuffer leftB = IntBuffer.allocate(1);
            IntBuffer topB = IntBuffer.allocate(1);
            IntBuffer rightB = IntBuffer.allocate(1);
            IntBuffer bottomB = IntBuffer.allocate(1);

            TessAPI1.TessPageIteratorBoundingBox(pi, WayToGetInfo, leftB, topB, rightB, bottomB);
            int left = leftB.get();
            int top = topB.get();
            int right = rightB.get();
            int bottom = bottomB.get();
            Rect rectangle1 = new Rect((int) (left-0.05*left), 
                                       (int) (top-0.05*top), 
                                       (int) ((right+0.05*right)-(left-0.05*left)),
                                       (int) ((bottom+0.5*bottom)-(top-0.05*top)));
            rectangles.add(rectangle1);

            String kword = "";
            for (String[] s:wordsToFind){
                //System.out.println(s[1]);
                if (word.toLowerCase().contains(s[1].toLowerCase())
                        ){
                    Rect rect = new Rect(left, top, right-left,bottom-top);
                    infos.add(copmare(word, s, rect, confidence));
                    kword = s[0];
                }
            }       
        }
    }
    draw(imageName, rectangles);
    return infos;   
}

回答1:

Convert your image to gray scale before running through tesseract

回答2:

That exception is usually due to Tesseract being unable to find tessdata folder. The datapath should be set to the parent of that folder.

String treiningDataPath = "C:\\Users\\Karmen\\Documents\\Bitbucket\\Podjetje\\lib\\Tess4J\\";

来源：https://stackoverflow.com/questions/35295582/tess4j-memory-access-error-in-tess4j-java