/// <summary>

        /// Min value filter.

        /// </summary>

        /// <param name="src">The source image.</param>

        /// <returns></returns>

        public static WriteableBitmap MinFilterProcess(WriteableBitmap src)////最小值滤波器

        {

            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;

                        gray = 255;

                        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;

                            if (gray > Gray[n])

                            {

                                gray = Gray[n];

                                tempb = B[n];

                                tempr = R[n];

                                tempg = G[n];

                            }

                        }

                        temp[i * 4 + j * w * 4] = (byte)tempb;

                        temp[i * 4 + 1 + j * w * 4] = (byte)tempg;

                        temp[i * 4 + 2 + j * w * 4] = (byte)tempr;

                    }

                }

                Stream sTemp = filterImage.PixelBuffer.AsStream();

                sTemp.Seek(0, SeekOrigin.Begin);

                sTemp.Write(temp, 0, w * 4 * h);

                return filterImage;

            }

            else

            {

                return null;

            }

        }

[图像效果]