文章和代码以及样例图片等相关资源,已经归档至【Github 仓库:digital-image-processing-matlab】或者公众号【AIShareLab】回复 数字图像处理 也可获取。
98.roifill
功能:在图像的任意区域中进行平滑插补。语法:
J = roifill(I,c,r)
J = roifill(I)
J = roifill(I,BW)
[J,BW] = roifill(...)
J = roifill(x,y,I,xi,yi)
[x,y,J,BW,xi,yi] = roifill(...)
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举例
I = imread('eight.tif');
c = [222 272 300 270 221 194];
r = [21 21 75 121 121 75];
J = roifill(I,c,r);
imshow(I)
figure, imshow(J)
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相关命令:roifilt2, roipoly
99.roifilt2
功能:过滤敏感区域。语法:
J = roifilt2(h,I,BW)
J = roifilt2(I,BW,fun)
J = roifilt2(I,BW,fun,P1,P2,...)
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举例
h = fspecial('unsharp');
J = roifilt2(h,I,BW);
imshow(J)
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相关命令:filter2, roipoly
100.roipoly
功能:选择一个敏感的多边形区域。语法:
BW = roipoly(I,c,r)
BW = roipoly(I)
BW = roipoly(x,y,I,xi,yi)
[BW,xi,yi] = roipoly(...)
[x,y,BW,xi,yi] = roipoly(...)
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举例
I = imread('eight.tif');
c = [222 272 300 270 221 194];
r = [21 21 75 121 121 75];
BW = roipoly(I,c,r);
imshow(I)
figure, imshow(BW)
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相关命令:roifilt2, roicolor, roifill
101.std2
功能:计算矩阵元素的标准偏移。语法:
相关命令: corr2, mean2
102.subimage
功能:在一幅图中显示多个图像。语法:
subimage(X,map)
subimage(I)
subimage(BW)
subimage(RGB)
subimage(x,y,...)
h = subimage(...)
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举例
load trees
[X2,map2] = imread('forest.tif');
subplot(1,2,1), subimage(X,map)
subplot(1,2,2), subimage(X2,map2)
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103.truesize
功能:调整图像显示尺寸。语法:
truesize(fig,[mrows mcols])
truesize(fig)
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相关命令:imshow, iptsetpref, iptgetpref
104.uint8
功能:转换数据为 8 位无符号整型。语法:
举例
a = [1 3 5];
b = uint8(a);
whos
Name Size Bytes Class
a 1x3 24 doublearray
b 1x3 3 uint8 array
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相关命令:double, im2double, im2uint8
105.uint16
功能:转换数据为 16 位无符号整型。语法:
举例
a = [1 3 5];
b = uint16(a);
whos
Name Size Bytes Class
a 1x3 24 double array
b 1x3 6 uint16 array
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相关命令:double, datatypes, uint8, uint32, int8, int16, int32.
106.warp
功能:将图像显示到纹理映射表面。语法:
warp(X,map)
warp(I,n)
warp(BW)
warp(RGB)
warp(z,...)
warp(x,y,z,...)
h = warp(...)
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举例
[x,y,z] = cylinder;
I = imread('testpat1.tif');
warp(x,y,z,I);
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相关命令:imshow
107.wiener2
功能:进行二维适应性去噪过滤处理。语法:
J = wiener2(I,[m n],noise)
[J,noise] = wiener2(I,[m n])
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举例
I = imread('saturn.tif');
J = imnoise(I,'gaussian',0,0.005);
K = wiener2(J,[5 5]);
imshow(J)
figure, imshow(K)
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相关命令:filter2, medfilt2
108.zoom
功能:缩放图像。语法:
zoom on
zoom off
zoom out
zoom reset
zoom
zoom xon
zoom yon
zoom(factor)
zoom(fig,option)
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相关命令:imcrop
参考文献:
[1] Rafael C. Gonzalez, Richard E. Woods, and Steven L. Eddins. 2003. Digital Image Processing Using MATLAB. Prentice-Hall, Inc., USA.
[2] 阮秋琦. 数字图像处理(MATLAB版)[M]. 北京:电子工业出版社, 2014.
[3] 冈萨雷斯. 数字图像处理(第三版)[M]. 北京:电子工业出版社, 2011.
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