public Bitmap renderCroppedGreyscaleBitmap() {int width = getWidth();int height = getHeight();int[] pixels = new int[width * height];byte[] yuv = yuvData;int inputOffset = top * dataWidth + left;for (int y = 0; y < height; y++) {int outputOffset = y * width;for (int x = 0; x < width; x++) {int grey = yuv[inputOffset + x] & 0xff;pixels[outputOffset + x] = 0xFF000000 | (grey * 0x00010101);}inputOffset += dataWidth;}Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);bitmap.setPixels(pixels, 0, width, 0, 0, width, height);return bitmap;}}