Add commands 8

Author: timerring

18_common_image_processing_commands_in_Matlab_(8).md

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+- [Matlab常用图像处理命令108例（八）](#matlab常用图像处理命令108例八)
+  - [98.roifill](#98roifill)
+  - [99.roifilt2](#99roifilt2)
+  - [100.roipoly](#100roipoly)
+  - [101.std2](#101std2)
+  - [102.subimage](#102subimage)
+  - [103.truesize](#103truesize)
+  - [104.uint8](#104uint8)
+  - [105.uint16](#105uint16)
+  - [106.warp](#106warp)
+  - [107.wiener2](#107wiener2)
+  - [108.zoom](#108zoom)
+
+
+# Matlab常用图像处理命令108例（八）
+
+## 98.roifill
+
+功能：在图像的任意区域中进行平滑插补。
+语法： 
+
+```matlab
+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(...)
+```
+
+举例 
+
+```matlab
+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)
+```
+
+![](https://raw.githubusercontent.com/timerring/scratchpad2023/main/2023/03/12-22-11-59-1678630315.png)
+
+相关命令： 
+roifilt2, roipoly
+
+## 99.roifilt2
+
+功能：过滤敏感区域。
+语法： 
+
+```matlab
+J = roifilt2(h,I,BW)
+J = roifilt2(I,BW,fun)
+J = roifilt2(I,BW,fun,P1,P2,...)
+```
+
+举例 
+
+```matlab
+h = fspecial('unsharp'); 
+J = roifilt2(h,I,BW); 
+imshow(J)
+```
+
+![](https://raw.githubusercontent.com/timerring/scratchpad2023/main/2023/03/12-22-12-09-1678630326.png)
+
+相关命令： 
+filter2, roipoly
+
+## 100.roipoly
+
+功能：选择一个敏感的多边形区域。
+语法： 
+
+```matlab
+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(...)
+```
+
+举例 
+
+```matlab
+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)
+```
+
+![](https://raw.githubusercontent.com/timerring/scratchpad2023/main/2023/03/12-22-12-21-1678630338.png)
+
+相关命令： 
+roifilt2, roicolor, roifill
+
+## 101.std2
+
+功能：计算矩阵元素的标准偏移。
+语法： 
+
+```matlab
+b = std2(A) 
+```
+
+相关命令： corr2, mean2
+
+## 102.subimage
+
+功能：在一幅图中显示多个图像。
+语法：
+
+```matlab
+subimage(X,map) 
+subimage(I) 
+subimage(BW) 
+subimage(RGB) 
+subimage(x,y,...)
+h = subimage(...)
+```
+
+举例 
+
+```matlab
+load trees
+[X2,map2] = imread('forest.tif'); 
+subplot(1,2,1), subimage(X,map) 
+subplot(1,2,2), subimage(X2,map2)
+```
+
+![](https://raw.githubusercontent.com/timerring/scratchpad2023/main/2023/03/12-22-12-35-1678630349.png)
+
+## 103.truesize
+
+功能：调整图像显示尺寸。
+语法： 
+
+```matlab
+truesize(fig,[mrows mcols]) 
+truesize(fig)
+```
+
+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： 
+
+```matlab
+B = uint8(A)
+```
+
+举例 
+
+```matlab
+a = [1 3 5];
+b = uint8(a);
+whos
+Name Size Bytes Class 
+a 1x3 24 doublearray
+b 1x3 3 uint8 array
+```
+
+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： 
+
+```matlab
+I = uint16(X)
+```
+
+举例 
+
+```matlab
+a = [1 3 5];
+b = uint16(a); 
+whos
+Name Size Bytes Class 
+a 1x3 24 double array 
+b 1x3 6 uint16 array 
+```
+
+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： 
+
+```matlab
+warp(X,map) 
+warp(I,n) 
+warp(BW) 
+warp(RGB) 
+warp(z,...)
+warp(x,y,z,...) 
+h = warp(...) 
+```
+
+举例 
+
+```matlab
+[x,y,z] = cylinder;
+I = imread('testpat1.tif'); 
+warp(x,y,z,I);
+```
+
+![](https://raw.githubusercontent.com/timerring/scratchpad2023/main/2023/03/12-22-12-49-1678630362.png)
+
+相关命令：
+imshow
+
+## 107.wiener2
+
+功能：进行二维适应性去噪过滤处理。
+语法： 
+
+```matlab
+J = wiener2(I,[m n],noise) 
+[J,noise] = wiener2(I,[m n]) 
+```
+
+举例 
+
+```matlab
+I = imread('saturn.tif');
+J = imnoise(I,'gaussian',0,0.005); 
+K = wiener2(J,[5 5]);
+imshow(J)
+figure, imshow(K)
+```
+
+![](https://raw.githubusercontent.com/timerring/scratchpad2023/main/2023/03/12-22-13-00-1678630376.png)
+
+相关命令： 
+filter2, medfilt2
+
+## 108.zoom
+
+功能：缩放图像。
+语法： 
+
+```matlab
+zoom on 
+zoom off 
+zoom out 
+zoom reset 
+zoom 
+zoom xon 
+zoom yon
+zoom(factor) 
+zoom(fig,option)
+```
+
+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.](https://github.com/timerring/digital-image-processing-matlab/blob/main/reference/Digital_Image_Processing_Using_Matlab.pdf)
+
+[2] [阮秋琦. 数字图像处理（MATLAB版）[M]. 北京：电子工业出版社, 2014.](https://github.com/timerring/digital-image-processing-matlab/blob/main/reference/Digital_Image_Processing_(MATLAB_version).pdf)
+
+[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.](https://github.com/timerring/digital-image-processing-matlab/blob/main/reference/Digital_Image_Processing_(Third_Edition).pdf)
+
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