How can you skip images Tesseract?

Question

I have a folder with a bit more than 50k images. Here is the code i have written.

public static File folder = new File("D:\\image\\");
public static File[] listofFiles = folder.listFiles();
private static int counter;

public static void main(String[] args) {

    Tesseract tesseract = new Tesseract();
    try {
        tesseract.setDatapath("C:\\Users\\zirpm\\Documents\\Coden\\Libaries\\Tess4J\\tessdata");
        for (int i = 0; i < listofFiles.length; i++) {
            String text = tesseract.doOCR(new File("D:\\image\\"+listofFiles[i].getName()));
            counter++;
            System.out.println("Image Number: "+counter+"  "+text);
        }


    }catch (TesseractException e) {
        e.printStackTrace();
        System.out.println("TESSERACT ERROR");
    }

}

Somehow it sometimes runs in to the following error:

Cannot convert RAW image to Pix with bpp = 64
Please call SetImage before attempting recognition.net.sourceforge.tess4j.TesseractException: java.lang.NullPointerException
at net.sourceforge.tess4j.Tesseract.doOCR(Unknown Source)
at net.sourceforge.tess4j.Tesseract.doOCR(Unknown Source)
at com.krissemicolon.Main.main(Main.java:23)
Caused by: java.lang.NullPointerException
at net.sourceforge.tess4j.Tesseract.getOCRText(Unknown Source)
at net.sourceforge.tess4j.Tesseract.doOCR(Unknown Source)
... 3 more

How could you just skip the images that causes that error and moves on to the next?

Answer 1

Just add another try-catch:

public static File folder = new File("D:\\image\\");
public static File[] listofFiles = folder.listFiles();
private static int counter;

public static void main(String[] args) {

    Tesseract tesseract = new Tesseract();
    try {
        tesseract.setDatapath("C:\\Users\\zirpm\\Documents\\Coden\\Libaries\\Tess4J\\tessdata");
        for (int i = 0; i < listofFiles.length; i++) {
            try{
                String text = tesseract.doOCR(new File("D:\\image\\"+listofFiles[i].getName()));
            }catch(TesseractException e){
                System.out.println("Skipping "+listOfFiles[i].getName());
            }
            counter++;
            System.out.println("Image Number: "+counter+"  "+text);
        }


    }catch (TesseractException e) {
        e.printStackTrace();
        System.out.println("TESSERACT ERROR");
    }

If a TesseractException occurs, it will inform you of the error and skip it.

You may also want to remove the outer try-catch-block.