Win8Metro(C#)数字图像处理--2.28图像乘法运算

[函数名称]

图像乘法函数MultiplicationProcess(WriteableBitmap src, WriteableBitmap mulSrc)

[函数代码]

        /// <summary>
        /// Multiplication of two images(Both of them should be in same size).
        /// </summary>
        /// <param name="src">The first source image.</param>
        /// <param name="maskSrc">The second source image(It is an mask that each pixel of it  is 0 or 1).</param>
        /// <returns></returns>
        public static WriteableBitmap MultiplicationProcess(WriteableBitmap src, WriteableBitmap maskSrc)////28图像乘法
        {
            if (src != null)
            {
                int w = src.PixelWidth;
                int h = src.PixelHeight;
                WriteableBitmap mulImage = new WriteableBitmap(w, h);
                byte[] temp = src.PixelBuffer.ToArray();
                byte[] mulTemp = maskSrc.PixelBuffer.ToArray();
                byte[] dst = new byte[w * h * 4];
                int r = 0, g = 0, b = 0;
                for (int i = 0; i < w; i++)
                {
                    for (int j = 0; j < h; j++)
                    {
                        b = temp[i * 4 + (h - 1 - j) * w * 4] * mulTemp[i * 4 + (h - 1 - j) * w * 4];
                        g = temp[i * 4 + 1 + (h - 1 - j) * w * 4] * mulTemp[i * 4 + 1 + (h - 1 - j) * w * 4];
                        r = temp[i * 4 + 2 + (h - 1 - j) * w * 4] * mulTemp[i * 4 + 2 + (h - 1 - j) * w * 4];
                        dst[i * 4 + j * w * 4] = (byte)(b > 0 ? (b < 255 ? b : 255) : 0);
                        dst[i * 4 + 1 + j * w * 4] = (byte)(g > 0 ? (g < 255 ? g : 255) : 0);
                        dst[i * 4 + 2 + j * w * 4] = (byte)(r > 0 ? (r < 255 ? r : 255) : 0);
                        dst[i * 4 + 3 + j * w * 4] = 0;
                        b = 0; g = 0; r = 0;
                    }
                }
                Stream sTemp = mulImage.PixelBuffer.AsStream();
                sTemp.Seek(0, SeekOrigin.Begin);
                sTemp.Write(dst, 0, w * 4 * h);
                return mulImage;
            }
            else
            {
                return null;
            }      
        }