中值滤波和均值滤波(2)

中值滤波和均值滤波

61 for (int i = 0; i <= bmp.Width - 1; i++)

62 {

63 for (int j = 0; j <= bmp.Height - 1; j++) 64 {

65 bmp.SetPixel(i, j, Color.FromArgb(mR[i, j], mG[i, j], mB[i, j]));

66 }

67 }

68 return bmp;

69 }

70

71 /// <summary>

72 /// 对矩阵M进行中值滤波

73 /// </summary>

74 /// <param name="m">矩阵M</param>

75 /// <param name="windowRadius">过滤半径</param>

76 /// <returns>结果矩阵</returns>

77 private byte[,] MedianFilterFunction(byte[,] m, int windowRadius)

78 {

79 int width = m.GetLength(0);

80 int height = m.GetLength(1);

81

82 byte[,] lightArray = new byte[width, height]; 83

84 //开始滤波

85 for (int i = 0; i <= width - 1; i++)

86 {

87 for (int j = 0; j <= height - 1; j++)

88 {

89 //得到过滤窗口矩形

90 Rectangle rectWindow = new Rectangle(i - windowRadius, j - windowRadius, 2 * windowRadius + 1, 2 * windowRadius + 1);

91 if (rectWindow.Left < 0) rectWindow.X = 0; 92 if (rectWindow.Top < 0) rectWindow.Y = 0; 93 if (rectWindow.Right > width - 1) rectWindow.Width = width - 1 - rectWindow.Left;

94 if (rectWindow.Bottom > height - 1) rectWindow.Height = height - 1 - rectWindow.Top;

95 //将窗口中的颜色取到列表中

96 List<byte> windowPixelColorList = new List<byte>();

中值滤波和均值滤波

97 for (int oi = rectWindow.Left; oi <= rectWindow.Right - 1; oi++)

98 {

99 for (int oj = rectWindow.Top; oj <= rectWindow.Bottom - 1; oj++)

100 {

101 windowPixelColorList.Add(m[oi, oj]);

102 }

103 }

104 //排序

105 windowPixelColorList.Sort();

106 //取中值

107 byte middleValue = 0;

108 if ((windowRadius * windowRadius) % 2 == 0) 109 {

110 //如果是偶数

111 middleValue = Convert.ToByte((windowPixelColorList[windowPixelColorList.Count / 2] + windowPixelColorList[windowPixelColorList.Count / 2 - 1]) / 2);

112 }

113 else

114 {

115 //如果是奇数

116 middleValue = windowPixelColorList[(windowPixelColorList.Count - 1) / 2];

117 }

118 //设置为中值

119 lightArray[i, j] = middleValue;

120 }

121 }

122 return lightArray;

123 }