How to get the Mat object from the Byte[] in openCV android?

Question

I am working with OpenCV library in Android. I have a class which implements PictureCallBack.

The override method onPictureTaken() is as g

Answer 1

opencv has a neat way to writing Mats to files - it can generate different formats based on the file extension provided. Here is a minimal example:

    public void writeImageToFile(Mat image, String filename) {

    File root = Environment.getExternalStorageDirectory();
    File file = new File(root, filename);

    Highgui.imwrite(file.getAbsolutePath(), image);

    if (DEBUG)
        Log.d(TAG,
                "writing: " + file.getAbsolutePath() + " (" + image.width()
                        + ", " + image.height() + ")");
}

if red and blue is swapped then it sounds like your byte data from onPictureTaken() is in BGRA format. You can swap it to RGBA using:

Imgproc.cvtColor(bgrImg, rgbImg, Imgproc.COLOR_BGR2RGB);

the format is actually device specific - on one device I had it comes through as YUV.