[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="" />