在python和java中使用OpenCV的不同图像

Question

I'm using OpenCV to modify an image in python and in java. The code is very simple but I'm not getting the same result, why?:

Python :

img =  cv2.imread('sudoku.jpg')
gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)

thresh = cv2.adaptiveThreshold(gray,255,1,1,5,2)
printImg(thresh)

Java :

BitmapFactory.Options op = new BitmapFactory.Options();
        op.inPreferredConfig = Bitmap.Config.ARGB_8888;
Bitmap bm = BitmapFactory.decodeResource(mContext.getResources(),
                R.drawable.sudoku1, op);
Utils.bitmapToMat(bm, img);
Imgproc.cvtColor(img, gray, Imgproc.COLOR_BGR2GRAY);
Imgproc.adaptiveThreshold(gray, thresh, 255, 1, 1, 5, 2);

Answer 1

So, I'd tested some configurations and tried some workarounds. The issue seems related to how to load the image. Convert the image from bitmap to mat seems to affect the quality of the image as @berak said. I ended up using Highgui.imread to get the image.

If someone knows how to do it in a more android-friendly way I'd like to hear it.

Cheers.