matlab 自适应中值滤波程序 adpmedian.m |
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matlab 自适应中值滤波程序 adpmedian.m
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来自冈萨雷斯数字图像处理Matlab中文版附录C 相对原文程序，（1）将第8行的‘|’更改为‘||’（2）第11行注释。其余保持不变。 %自适应中值滤波 function f = adpmedian (g, Smax) % ADPMEDIAN Parform adaptive median filtering. % F = ADPMEDIAN(G, SMAX) performs adaptive median filtering of % image G. The median filter starts at size 3-by-3 and iterates up % to size SMAX-by-SMAX. SMAX must be an odd integer greater than 1. % SMAX must be an odd, positive integer greater than 1. if (Smax zmin) & (zmax > zmed) &... ~alreadyProcessed; zB = (g > zmin) & (zmax > g); outputZxy = processUsingLevelB & zB; outputZmed = processUsingLevelB & ~zB; f (outputZxy) = g(outputZxy); f (outputZmed) = zmed(outputZmed); alreadyProcessed = alreadyProcessed | processUsingLevelB; if all (alreadyProcessed (:)) break; end end % Output zmed for any remaining unprocessed pixels. Note that this % zmed was computed using a window of size Smax-by-Smax, which is % the final value of k in the loop. f (~alreadyProcessed) = zmed (~alreadyProcessed); end使用方法： f = adpmedian (g, Smax) 其中：g为输入二维图像，Smax为最大滤波尺寸，f为自适应滤波后输出图像 参考实例： Gray = imread('cameraman.tif'); %读取图像文件 %加入各种浓度的椒盐噪声 N1 = imnoise(Gray,'salt & pepper',0.05);%椒盐噪声，噪声密度0.05 N2 = imnoise(Gray,'salt & pepper',0.25);%椒盐噪声，噪声密度0.25 N3 = imnoise(Gray,'salt & pepper',0.45);%椒盐噪声，噪声密度0.45 N4 = imnoise(Gray,'salt & pepper',0.65);%椒盐噪声，噪声密度0.65 %中值滤波 M1 = medfilt2(N1); M2 = medfilt2(N2); M3 = medfilt2(N3); M4 = medfilt2(N4); %自适应中值滤波 f1 = adpmedian(N1,11); f2 = adpmedian(N2,11); f3 = adpmedian(N3,11); f4 = adpmedian(N4,11); figure subplot(341); imshow(N1); subplot(342); imshow(N2); subplot(343); imshow(N3); subplot(344); imshow(N4); subplot(345); imshow(M1); subplot(346); imshow(M2); subplot(347); imshow(M3); subplot(348); imshow(M4); subplot(349); imshow(f1); subplot(3,4,10); imshow(f2); subplot(3,4,11); imshow(f3); subplot(3,4,12); imshow(f4);实验效果如下： 第一行分别为加入浓度0.05、0.25、0.45、0.65的椒盐噪声 第二行为中值滤波medfilt2处理效果，默认滤波尺寸 3*3 第三行为自适应中值滤波adpmedian 处理效果，最大滤波尺寸为11*11
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