/**
* Mat轉換成byte數組
*
* @param matrix 要轉換的Mat
* @param fileExtension 格式為 ".jpg", ".png", etc
* @return
*/
public static byte[] mat2Byte(Mat matrix, String fileExtension) {
MatOfByte mob = new MatOfByte();
Imgcodecs.imencode(fileExtension, matrix, mob);
byte[] byteArray = mob.toArray();
return byteArray;
}
byte[] byteString = mat2Byte(mat, ".jpg");
Mat mat = Imgcodecs.imdecode(new MatOfByte(byteString), Imgcodecs.CV_LOAD_IMAGE_UNCHANGED);
Imgcodecs.imwrite(failName, mat);