Leptonica OpenCV Java convert Mat to Pix and vise versa

Question

I use the following lept4j and OpenCV Maven dependencies:

    net.sourceforg         


        

Answer 1

Try the following:

public static Pix convertMatToPix(Mat mat) {
    MatOfByte bytes = new MatOfByte();
    Imgcodecs.imencode(".tif", mat, bytes);
    ByteBuffer buff = ByteBuffer.wrap(bytes.toArray());
    return Leptonica1.pixReadMem(buff, new NativeSize(buff.capacity()));
}

public static Mat convertPixToMat(Pix pix) {
    PointerByReference pdata = new PointerByReference();
    NativeSizeByReference psize = new NativeSizeByReference();
    Leptonica1.pixWriteMem(pdata, psize, pix, ILeptonica.IFF_TIFF);
    byte[] b = pdata.getValue().getByteArray(0, psize.getValue().intValue());
    Leptonica1.lept_free(pdata.getValue());
    return Imgcodecs.imdecode(new MatOfByte(b), Imgcodecs.CV_LOAD_IMAGE_UNCHANGED);
}