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我正在使用 tesseract 识别 pdf 中的文本，但我遇到了一些奇怪的错误。错误是 Error opening data file data/tessdata/eng.traineddata 请确保将 TESSDATA_PREFIX 环境变量设置为“tessdata”目录的父目录。

现在，我理解了这个错误的含义，并且我的路径已更新到数据文件夹的父目录。但奇怪的是，当我运行我的代码时，我并没有立即得到这个错误，而是在识别 10-15 个 pdf（每个大约 40 页）后得到它。在我收到此错误并从程序之前停止的 pdf 再次运行我的程序后，我在另外 10-15 个 pdf 读数中没有收到任何错误。

现在这很奇怪，我不明白这背后的原因。如果有人遇到过这种情况或知道这背后的原因，请发表评论。

这是我用来识别 pdf 特定页面中的文本的功能。我为每个 pdf 的每一页调用这个函数。

public static void getOCRDataFromPage(PDDocument pdDoc, int page, ArrayList<Characters> ch)
{
    TessBaseAPI handle=TessAPI1.TessBaseAPICreate();
    TessAPI1.TessBaseAPIInit3(handle, "data", "eng");
    try
    {
     double w=pdDoc.getPage(page-1).getCropBox().getWidth();
     double h=pdDoc.getPage(page-1).getCropBox().getHeight();

     PDFRenderer pdfRenderer = new PDFRenderer(pdDoc);
     BufferedImage image = pdfRenderer.renderImageWithDPI(page-1, 300,ImageType.GRAY);
     //image=ImageHelper.convertImageToGrayscale(image);
     ImageIOUtil.writeImage(image,"G:/Trial/tempImg.png", 300);
     int bpp = image.getColorModel().getPixelSize();
     int bytespp = bpp / 8;
     int bytespl = (int) Math.ceil(image.getWidth() * bpp / 8.0);
     int height = image.getHeight();
     int width = image.getWidth();

     TessAPI1.TessBaseAPISetImage(handle, ImageIOHelper.convertImageData(image), width, height, bytespp, bytespl);
     TessAPI1.TessBaseAPISetPageSegMode(handle, TessPageSegMode.PSM_AUTO);
     image.flush();
     image=null;
     ETEXT_DESC monitor = new ETEXT_DESC();
     TessAPI1.TessBaseAPIRecognize(handle, monitor);
     TessResultIterator ri = TessAPI1.TessBaseAPIGetIterator(handle);
     TessPageIterator pi = TessAPI1.TessResultIteratorGetPageIterator(ri);
     TessAPI1.TessPageIteratorBegin(pi);
     int level = TessAPI1.TessPageIteratorLevel.RIL_WORD;
     ArrayList<Words> wd=new ArrayList<Words>();
     do {
     Pointer ptr = TessAPI1.TessResultIteratorGetUTF8Text(ri, level);
     if(ptr == null || ptr.toString().length()==0)
         break;
     String word = ptr.getString(0);
     TessAPI1.TessDeleteText(ptr);
     float confidence = TessAPI1.TessResultIteratorConfidence(ri, level);
     IntBuffer leftB = IntBuffer.allocate(1);
     IntBuffer topB = IntBuffer.allocate(1);
     IntBuffer rightB = IntBuffer.allocate(1);
     IntBuffer bottomB = IntBuffer.allocate(1);
     TessAPI1.TessPageIteratorBoundingBox(pi, level, leftB, topB, rightB, bottomB);
     int left = leftB.get();
     int top = topB.get();
     int right = rightB.get();
     int bottom = bottomB.get();
     IntBuffer boldB = IntBuffer.allocate(1);
     IntBuffer italicB = IntBuffer.allocate(1);
     IntBuffer underlinedB = IntBuffer.allocate(1);
     IntBuffer monospaceB = IntBuffer.allocate(1);
     IntBuffer serifB = IntBuffer.allocate(1);
     IntBuffer smallcapsB = IntBuffer.allocate(1);
     IntBuffer pointSizeB = IntBuffer.allocate(1);
     IntBuffer fontIdB = IntBuffer.allocate(1);
     String fontName = TessAPI1.TessResultIteratorWordFontAttributes(ri, boldB, italicB, underlinedB,
     monospaceB, serifB, smallcapsB, pointSizeB, fontIdB);
     boolean bold = boldB.get() == TRUE;
     boolean italic = italicB.get() == TRUE;
     boolean underlined = underlinedB.get() == TRUE;
     boolean monospace = monospaceB.get() == TRUE;
     boolean serif = serifB.get() == TRUE;
     boolean smallcaps = smallcapsB.get() == TRUE;
     int pointSize = pointSizeB.get();
     int fontId = fontIdB.get();
     Words chr=new Words(); // Words is a user-defined class 
     chr.c=word.concat(" ");
     chr.b=bold==true?1:0;
     chr.x=left*w/width;
     chr.size=pointSize;
     chr.name=fontName;
     chr.y=top*h/height;
     chr.w=(right-left)*w/width;
     chr.h=(bottom-top)*h/height;
     if(pointSize>1)
         wd.add(chr);
     } while (TessAPI1.TessPageIteratorNext(pi, level) == TRUE);

     sortWords(wd);
     wordsToChar(wd,ch);
     wd=null;
    }
catch(Exception e)
    {
        System.out.println(e.toString());
        e.printStackTrace();
    }
    finally
    {
         //TessAPI1.TessBaseAPIClearAdaptiveClassifier(handle);
         TessAPI1.TessBaseAPIClearPersistentCache(handle);
         TessAPI1.TessBaseAPIClear(handle);
         //TessAPI1.TessBaseAPIDelete(handle);
         TessAPI1.TessBaseAPIEnd(handle);
         handle=null;
    }

}

如果有人发现任何异常情况，请回复。

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