tess4j: NullPointerException while reading text in rectangle of image.

[Dattatraya Tembare]

I'm trying to read the text from an image at some particular location in an image. I have image dimensions and desired rectangle dometions.

Here is the code implementation:

public static void main(String[] args) {
 String fileStr = "C:/EA/mp-out/im/1/3/1-0.png";
 File file = new File(fileStr);
 //380x45+220+170
 int xsize = 0;
 int ysize = 0;
 BufferedImage bufImage;
 ByteBuffer buf = null;
 try {
 bufImage = ImageIO.read(file);
 IIOImage image=new IIOImage(bufImage,null,null);
 buf = ImageIOHelper.getImageByteBuffer(image);
 } catch (IOException e2) {
 e2.printStackTrace();
 }
 Rectangle rect = new Rectangle(0, 0, 600, 265); // define an equal or smaller region of interest on the image
 int bpp = 8; //Gray=8, RGB=24
 
 Tesseract in = new ReadImageText().getTesseractInstance("C:/Program Files (x86)/Tesseract-OCR/tessdata/", "hin");
 try {
 String resultText = in.doOCR(xsize, ysize, buf, rect, bpp);
 log.info("resultText: {}", resultText);
 } catch (TesseractException e) {
 e.printStackTrace();
 }
 }

When I have executed the code, go below error: 

java.lang.NullPointerException: null
 at net.sourceforge.tess4j.Tesseract.getOCRText(Tesseract.java:434)
 at net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:351)
 at net.sourceforge.tess4j.Tesseract.doOCR(Tesseract.java:323)
 at com.ea.ocr.tesseract.ReadImageText.main(ReadImageText.java:74)

Please look into it and let me know if anyone has any idea.

[Dattatraya Tembare]

I have used another method, and it worked perfectly.

public static void main(String[] args) {
 String fileStr = "C:/EA/mp-out/im/1/3/1-0.png";
 File file = new File(fileStr);
 //380x45+220+170
 int xsize = 0;
 int ysize = 0;

 BufferedImage bufImage=null;

 ByteBuffer buf = null;
 try {
 bufImage = ImageIO.read(file);
 IIOImage image=new IIOImage(bufImage,null,null);
 buf = ImageIOHelper.getImageByteBuffer(image);
 } catch (IOException e2) {
 e2.printStackTrace();
 }

 Rectangle rect = new Rectangle(220, 170, 380, 45); // define an equal or smaller region of interest on the image

 int bpp = 8; //Gray=8, RGB=24
 
 Tesseract in = new ReadImageText().getTesseractInstance("C:/Program Files (x86)/Tesseract-OCR/tessdata/", "hin");
 try {

 String resultText = in.doOCR(bufImage, rect);
 //in.doOCR(xsize, ysize, buf, rect, bpp);

[ShreeDevi Kumar]

For tess4j see

https://github.com/nguyenq/tess4j/blob/master/src/test/java/net/sourceforge/tess4j/TessAPI1Test.java

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[Dattatraya Tembare]

Thank you!

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Best Regards,
Dattatraya Tembare

+1 914 721 6311