JarCastingBridJ bindings for Tesseract 3.03
This library is no longer maintained! Consider using javacpp-presets/tesseract instead.
A Java library that can be used to access Tesseract's C API from Java through BridJ. Therefore, this library provides interfaces that cover all of Tesseract's C API. BridJ classes were generated automatically by using JNAerator on Tesseract's capi.h.
This library does only cover the C API. If you are looking for a more convenient way to use Tesseract from Java, have a look at Tess4J.
Get
Information on how to get binary releases, documentation and source distributions of this software can be found on search.maven.org.
Usage example
The following lines show how to use this library to recognize text in a PNG image file.
package de.vorb.tesseract.example;
import java.awt.image.BufferedImage;
import java.awt.image.DataBuffer;
import java.awt.image.DataBufferByte;
import java.io.File;
import java.io.IOException;
import java.nio.ByteBuffer;
import javax.imageio.ImageIO;
import org.bridj.BridJ;
import org.bridj.Pointer;
import de.vorb.tesseract.bridj.Tesseract;
import de.vorb.tesseract.bridj.Tesseract.TessBaseAPI;
import de.vorb.tesseract.bridj.OCREngineMode;
import de.vorb.tesseract.bridj.PageSegMode;
public class BridJExample {
public static void main(String[] args) throws IOException {
// provide the native library file
BridJ.setNativeLibraryFile("tesseract", new File("libtesseract303.dll"));
long start = System.currentTimeMillis();
// create a reference to an execution handle
final Pointer<TessBaseAPI> handle = Tesseract.TessBaseAPICreate();
// init Tesseract with data path, language and OCR engine mode
Tesseract.TessBaseAPIInit2(handle,
Pointer.pointerToCString("E:\\Masterarbeit\\Ressourcen\\tessdata"),
Pointer.pointerToCString("deu-frak"), OCREngineMode.DEFAULT);
// set page segmentation mode
Tesseract.TessBaseAPISetPageSegMode(handle, PageSegMode.AUTO);
// read the image into memory
final BufferedImage inputImage = ImageIO.read(new File("input.png"));
// get the image data
final DataBuffer imageBuffer = inputImage.getRaster().getDataBuffer();
final byte[] imageData = ((DataBufferByte) imageBuffer).getData();
// image properties
final int width = inputImage.getWidth(), height = inputImage.getHeight();
final int bitsPerPixel = inputImage.getColorModel().getPixelSize();
final int bytesPerPixel = bitsPerPixel / 8;
final int bytesPerLine = (int) Math.ceil(width * bitsPerPixel / 8.0);
// set the image
Tesseract.TessBaseAPISetImage(handle,
Pointer.pointerToBytes(ByteBuffer.wrap(imageData)), width, height,
bytesPerPixel, bytesPerLine);
// get the text result
final String txt = Tesseract.TessBaseAPIGetUTF8Text(handle).getCString();
// print the result
System.out.println(txt);
// calculate the time
System.out.println("time: " + (System.currentTimeMillis() - start) + "ms");
// delete handle
Tesseract.TessBaseAPIDelete(handle);
}
}
Other example files can be found at src/test/java/de/vorb/tesseract/example.