imageRotate = imgGray.Rotate(-avg, new Gray(255));
        }
        else
        {
            imageRotate = imgGray;
        }
        imgGray.Dispose();

        //return imageRotate.Bitmap;
        return BlackFilterImage(imageRotate);
    }

    private static Bitmap BlackFilterImage(Image<Gray, byte> img)
    {
        UMat resultImg = new UMat();
        CvInvoke.Threshold(img, resultImg, 105, 255, ThresholdType.BinaryInv); //Ошибка возникала тут