Win8Metro(C#)数字图像处理--2.34直方图规定化

原文:Win8Metro(C#)数字图像处理--2.34直方图规定化



[函数名称]

WriteableBitmap HistogramSpecificateProcess(WriteableBitmap src, WriteableBitmap dst)

[算法说明]

[函数代码]
        /// <summary>
        /// Histogram specification process.
        /// </summary>
        /// <param name="src">The source image.</param>
        /// <param name="dst">The image to get histogram to use.</param>
        /// <returns></returns>
        public static WriteableBitmap HistogramSpecificateProcess(WriteableBitmap src, WriteableBitmap dst)////38图像直方图规定化
        {
            if (src != null)
            {
                int w = src.PixelWidth;
                int h = src.PixelHeight;
                byte[]histMap=HistogramMap(dst);
                WriteableBitmap histImage = new WriteableBitmap(w, h);
                byte[] temp = src.PixelBuffer.ToArray();
                for (int i = 0; i < temp.Length; i += 4)
                {
                    temp[i] = (byte)(255 * histMap[temp[i]]);
                    temp[i + 1] = (byte)(255 * histMap[temp[i+1]]);
                    temp[i + 2] = (byte)(255 * histMap[temp[i+2]]);
                }
                Stream sTemp = histImage.PixelBuffer.AsStream();
                sTemp.Seek(0, SeekOrigin.Begin);
                sTemp.Write(temp, 0, w * 4 * h);
                return histImage;
            }
            else
            {
                return null;
            }
        }
        public static byte[] HistogramMap(WriteableBitmap src)
        {
            if (src != null)
            {
                byte[] temp = src.PixelBuffer.ToArray();
                byte gray;
                int[] tempArray = new int[256];
                int[] countPixel = new int[256];
                byte[] pixelMap = new byte[256];
                for (int i = 0; i < temp.Length; i += 4)
                {
                    gray = (byte)(temp[i] * 0.114 + temp[i + 1] * 0.587 + temp[i + 2] * 0.299);
                    countPixel[gray]++;
                }
                for (int i = 0; i < 256; i++)
                {
                    if (i != 0)
                    {
                        tempArray[i] = tempArray[i - 1] + countPixel[i];
                    }
                    else
                    {
                        tempArray[0] = countPixel[0];
                    }
                    pixelMap[i] = (byte)(255 * tempArray[i] * 4 / temp.Length + 0.5);
                }
                return pixelMap;
            }
            else
                return null;
        }
[图像效果]

<img src="http://img.blog.csdn.net/20150412104816739?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvVHJlbnQxOTg1/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />