[函数代码]

        /// <summary>
        /// Binary process.
        /// </summary>
        /// <param name="src">Source image.</param>
        /// <param name="threshould">Define a threshould value for binary processing, from 0 to 255.</param>
        /// <returns></returns>
        public static WriteableBitmap BinaryProcess(WriteableBitmap src, int threshould)////2 二值化处理 
        {
            if(src!=null )
            {
            int w = src.PixelWidth;
            int h = src.PixelHeight;
            WriteableBitmap binaryImage = new WriteableBitmap(w,h);
            byte[] temp = src.PixelBuffer.ToArray();
            for (int i = 0; i < temp.Length; i += 4)
            {
                byte tempByte = (byte)(((temp[i] + temp[i + 1] + temp[i + 2]) / 3) < threshould ? 0 : 255);
                temp[i] = tempByte;
                temp[i + 1] = tempByte;
                temp[i + 2] = tempByte;
            }
            Stream sTemp = binaryImage.PixelBuffer.AsStream();
            sTemp.Seek(0, SeekOrigin.Begin);
            sTemp.Write(temp, 0, w * 4 * h);
            return binaryImage;
             }
            else
            {
                return null;
            }   
        }