/// <summary>/// Alpha filter./// </summary>/// <param name="src">The source image.</param>/// <param name="tNumber">One parameter set from 0 to 9.</param>/// <returns></returns>public static WriteableBitmap AlphaFilterProcess(WriteableBitmap src, int tNumber)修正的阿尔法滤波器{if (src != null){int w = src.PixelWidth;int h = src.PixelHeight;WriteableBitmap filterImage = new WriteableBitmap(w, h);byte[] temp = src.PixelBuffer.ToArray();byte[] tempMask = (byte[])temp.Clone();double[] Gray = new double[9];double gray = 255;int tempr = 0, tempb = 0, tempg = 0;for (int j = 1; j < h - 1; j++){for (int i = 1; i < w - 1; i++){tempb = 0;tempg = 0;tempr = 0;int[] B = new int[9] { tempMask[i * 4 + j * w * 4], tempMask[(i - 1) * 4 + (j - 1) * w * 4], tempMask[i * 4 + (j - 1) * w * 4], tempMask[(i + 1) * 4 + (j - 1) * w * 4], tempMask[(i - 1) * 4 + j * w * 4], tempMask[(i + 1) * 4 + j * w * 4], tempMask[(i - 1) * 4 + (j + 1) * w * 4], tempMask[i * 4 + (j + 1) * w * 4], tempMask[(i + 1) * 4 + (j + 1) * w * 4] };int[] G = new int[9] { tempMask[i * 4 + 1 + j * w * 4], tempMask[(i - 1) * 4 + 1 + (j - 1) * w * 4], tempMask[i * 4 + 1 + (j - 1) * w * 4], tempMask[(i + 1) * 4 + 1 + (j - 1) * w * 4], tempMask[(i - 1) * 4 + 1 + j * w * 4], tempMask[(i + 1) * 4 + 1 + j * w * 4], tempMask[(i - 1) * 4 + 1 + (j + 1) * w * 4], tempMask[i * 4 + 1 + (j + 1) * w * 4], tempMask[(i + 1) * 4 + 1 + (j + 1) * w * 4] };int[] R = new int[9] { tempMask[i * 4 + 2 + j * w * 4], tempMask[(i - 1) * 4 + 2 + (j - 1) * w * 4], tempMask[i * 4 + 2 + (j - 1) * w * 4], tempMask[(i + 1) * 4 + 2 + (j - 1) * w * 4], tempMask[(i - 1) * 4 + 2 + j * w * 4], tempMask[(i + 1) * 4 + 2 + j * w * 4], tempMask[(i - 1) * 4 + 2 + (j + 1) * w * 4], tempMask[i * 4 + 2 + (j + 1) * w * 4], tempMask[(i + 1) * 4 + 2 + (j + 1) * w * 4] };for (int n = 0; n < 9; n++){Gray[n] = (double)B[n] * 0.114 + (double)G[n] * 0.587 + (double)R[n] * 0.299;}                                             for (int x = 0; x < 9; x++){for (int y = x + 1; y < 9; y++){gray = Gray[x];tempb = B[x];tempg = G[x];tempr = R[x];if (Gray[x] > Gray[y]){Gray[x] = Gray[y];Gray[y] = gray;B[x] = B[y];G[x] = G[y];R[x] = R[y];B[y] = tempb;G[y] = tempg;R[y] = tempr;}}}if (tNumber < 0 || tNumber > 8) return null;tNumber = (tNumber % 2 == 0 ? tNumber : tNumber - 1);for (int m = 0; m < (int)(tNumber / 2); m++){R[m] = 0;G[m] = 0;B[m] = 0;R[8 - m] = 0;G[8 - m] = 0;B[8 - m] = 0;}temp[i * 4 + j * w * 4] = (byte)(B.Sum() / (9 - tNumber));temp[i * 4 + 1 + j * w * 4] = (byte)(G.Sum() / (9 - tNumber));temp[i * 4 + 2 + j * w * 4] = (byte)(R.Sum() / (9 - tNumber));}}Stream sTemp = filterImage.PixelBuffer.AsStream();sTemp.Seek(0, SeekOrigin.Begin);sTemp.Write(temp, 0, w * 4 * h);return filterImage;}else{return null;}}