Hello,
i want remove background from captured image. As of now i am capture usa driving license image and convert it into canny image. Here bellow is my output image so i want to remove rest of all background Except for square of the license image. i was try grab cut image for this but it's not working properly.
because sometime it's transparent card background also. i need transparent only rest of other background canny edges not a card.
It will be great, if you suggest me the way.
here is my code which i used from this [reference code](http://answers.opencv.org/question/24463/how-to-remove-black-background-from-grabcut-output-image-in-opencv-android/):
public Bitmap removeBackground(Bitmap bitmap)
{
//GrabCut part
Mat img = new Mat();
Utils.bitmapToMat(bitmap, img);
int r = img.rows();
int c = img.cols();
Point p1 = new Point(c / 100, r / 100);
Point p2 = new Point(c - c / 100, r - r / 100);
Rect rect = new Rect(p1, p2);
Mat mask = new Mat();
Mat fgdModel = new Mat();
Mat bgdModel = new Mat();
Mat imgC3 = new Mat();
Imgproc.cvtColor(img, imgC3, Imgproc.COLOR_RGBA2RGB);
Imgproc.grabCut(imgC3, mask, rect, bgdModel, fgdModel, 1 ,Imgproc.GC_INIT_WITH_RECT);
Mat source = new Mat(1, 1, CvType.CV_8U, new Scalar(3.0));
Core.compare(mask, source/* GC_PR_FGD */, mask, Core.CMP_EQ);
//This is important. You must use Scalar(255,255, 255,255), not Scalar(255,255,255)
Mat foreground = new Mat(img.size(), CvType.CV_8UC3, new Scalar(255, 255, 255, 255));
img.copyTo(foreground, mask);
// convert matrix to output bitmap
bitmap = Bitmap.createBitmap((int) foreground.size().width, (int) foreground.size().height,
Bitmap.Config.ARGB_8888);
Utils.matToBitmap(foreground, bitmap);
findEdges(bitmap);
return bitmap;
}
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