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Author: timerring

15_common_image_processing_commands_in_Matlab_(5).md

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+- [Matlab常用图像处理命令108例（五）](#matlab常用图像处理命令108例五)
+  - [54.imcontour](#54imcontour)
+  - [55.imcrop](#55imcrop)
+  - [56.imfeature](#56imfeature)
+  - [57.imfinfo](#57imfinfo)
+  - [58.imhist](#58imhist)
+  - [59.immovie](#59immovie)
+  - [60.imnoise](#60imnoise)
+  - [61.impixel](#61impixel)
+  - [62.improfile](#62improfile)
+  - [63.imread](#63imread)
+  - [64.imresize](#64imresize)
+  - [65.imrotate](#65imrotate)
+
+
+# Matlab常用图像处理命令108例（五）
+
+## 54.imcontour
+
+功能：创建图像数据的轮廓图。
+语法： 
+
+```matlab
+imcontour(I,n) 
+imcontour(I,v) 
+imcontour(x,y,...) 
+imcontour(...,LineSpec) 
+[C,h] = imcontour(...)
+```
+
+举例 
+
+```matlab
+I = imread('ic.tif'); 
+imcontour(I,3)
+```
+
+![](https://raw.githubusercontent.com/timerring/scratchpad2023/main/2023/03/11-22-41-58-1678545713.png)
+
+相关命令： 
+clabel, contour, LineSpec
+
+## 55.imcrop
+
+功能：剪切图像。
+语法： 
+
+```matlab
+I2 = imcrop(I)
+X2 = imcrop(X,map) 
+RGB2 = imcrop(RGB) 
+I2 = imcrop(I,rect)
+X2 = imcrop(X,map,rect) 
+RGB2 = imcrop(RGB,rect) 
+[...] = imcrop(x,y,...) 
+[A,rect] = imcrop(...)
+[x,y,A,rect] = imcrop(...)
+```
+
+举例 
+
+```matlab
+I = imread('ic.tif');
+I2 = imcrop(I,[60 40 100 90]);
+imshow(I)
+figure, imshow(I2)
+```
+
+![](https://raw.githubusercontent.com/timerring/scratchpad2023/main/2023/03/11-22-42-10-1678545727.png)
+
+相关命令： 
+zoom
+
+## 56.imfeature
+
+功能：计算图像区域的特征尺寸。
+语法： 
+
+```matlab
+stats = imfeature(L,measurements) 
+stats = imfeature(L,measurements,n) 
+```
+
+举例 
+
+```matlab
+BW = imread('text.tif');
+L = bwlabel(BW);
+stats = imfeature(L,'all'); 
+stats(23)
+ans =
+Area: 89
+Centroid: [95.6742 192.9775]
+BoundingBox: [87.5000 184.5000 16 15]
+MajorAxisLength: 19.9127
+MinorAxisLength: 14.2953
+Eccentricity: 0.6961
+Orientation: 9.0845 
+ConvexHull: [28x2 double]
+ConvexImage: [15x16 uint8 ] 
+ConvexArea: 205
+Image: [15x16 uint8 ] 
+FilledImage: [15x16 uint8 ] 
+FilledArea: 122
+EulerNumber: 0 
+Extrema: [ 8x2 double] 
+EquivDiameter: 10.6451
+Solidity: 0.4341
+Extent: 0.3708 
+PixelList: [89x2 double]
+```
+
+相关命令：
+bwlabel
+
+## 57.imfinfo
+
+功能：返回图形文件信息。
+语法： 
+
+```matlab
+info = imfinfo(filename,fmt) 
+info = imfinfo(filename)
+```
+
+举例 
+
+```matlab
+info = imfinfo('canoe.tif') 
+info = Filename:'canoe.tif'
+FileModDate: '25-Oct-1996 22:10:39'
+FileSize: 69708 
+Format: 'tif' 
+FormatVersion: [] 
+Width: 346
+Height: 207
+BitDepth: 8 
+ColorType: 'indexed'
+FormatSignature: [73 73 42 0] 
+ByteOrder: 'little-endian' 
+NewSubfileType: 0
+BitsPerSample: 8 
+Compression: 'PackBits'
+
+PhotometricInterpretation: 'RGB Palette' 
+StripOffsets: [ 9x1 double] 
+SamplesPerPixel: 1
+RowsPerStrip: 23 
+StripByteCounts: [ 9x1 double] 
+XResolution: 72
+YResolution: 72 
+ResolutionUnit: 'Inch' 
+Colormap: [256x3 double] 
+PlanarConfiguration: 'Chunky' 
+TileWidth: []
+TileLength: [] 
+TileOffsets: [] 
+TileByteCounts: [] 
+Orientation: 1
+FillOrder: 1
+GrayResponseUnit: 0.0100
+MaxSampleValue: 255
+MinSampleValue: 0
+Thresholding: 1 
+```
+
+相关命令： imread, imwrite
+
+## 58.imhist
+
+功能：显示图像数据的柱状图。
+语法： 
+
+```matlab
+imhist(I,n) 
+imhist(X,map) 
+[counts,x] = imhist(...) 
+```
+
+举例 
+
+```matlab
+I = imread('pout.tif');
+imhist(I)
+```
+
+![](https://raw.githubusercontent.com/timerring/scratchpad2023/main/2023/03/11-22-42-27-1678545743.png)
+
+相关命令： 
+histeq
+
+## 59.immovie
+
+功能：创建多帧索引图的电影动画。
+语法： 
+
+```matlab
+mov = immovie(X,map)
+```
+
+举例 
+
+```matlab
+load mri
+mov = immovie(D,map); 
+```
+
+相关命令： montage
+
+## 60.imnoise
+
+功能：增加图像的渲染效果。 
+语法： 
+
+```matlab
+J = imnoise(I,type)
+J = imnoise(I,type,parameters)
+```
+
+举例 
+
+```matlab
+I = imread('eight.tif');
+J = imnoise(I,'salt & pepper',0.02); 
+imshow(I)
+figure, imshow(J)
+```
+
+![](https://raw.githubusercontent.com/timerring/scratchpad2023/main/2023/03/11-22-42-40-1678545756.png)
+
+相关命令： 
+rand
+
+## 61.impixel
+
+功能：确定像素颜色值。
+语法： 
+
+```matlab
+P = impixel(I)
+P = impixel(X,map) 
+P = impixel(RGB) 
+P = impixel(I,c,r)
+P = impixel(X,map,c,r) 
+P = impixel(RGB,c,r) 
+[c,r,P] = impixel(...)
+P = impixel(x,y,I,xi,yi)
+P = impixel(x,y,X,map,xi,yi) 
+P = impixel(x,y,RGB,xi,yi) 
+[xi,yi,P] = impixel(x,y,...) 
+```
+
+举例 
+
+```matlab
+RGB = imread('flowers.tif');
+c = [12 146 410];
+r = [104 156 129];
+pixels = impixel(RGB,c,r) 
+pixels =
+61 59 101
+253 240 0
+237 37 44
+```
+
+相关命令： 
+improfile, pixval
+
+## 62.improfile
+
+功能：沿线段计算剖面图的像素值。
+语法： 
+
+```matlab
+c = improfile
+c = improfile(n)
+c = improfile(I,xi,yi)
+c = improfile(I,xi,yi,n) 
+[cx,cy,c] = improfile(...)
+[cx,cy,c,xi,yi] = improfile(...)
+[...] = improfile(x,y,I,xi,yi)
+[...] = improfile(x,y,I,xi,yi,n)
+[...] = improfile(...,method)
+```
+
+举例 
+
+```matlab
+I = imread('alumgrns.tif'); 
+x = [35 338 346 103];
+y = [253 250 17 148];
+improfile(I,x,y), grid on
+```
+
+![](https://raw.githubusercontent.com/timerring/scratchpad2023/main/2023/03/11-22-42-52-1678545768.png)
+
+相关命令： 
+impixel, pixval
+
+## 63.imread
+
+功能：从图形文件中读取图像。
+语法： 
+
+```matlab
+A = imread(filename,fmt) 
+[X,map] = imread(filename,fmt) 
+[...] = imread(filename)
+[...] = imread(...,idx) (TIFF only)
+[...] = imread(...,ref) (HDF only)
+[...] = imread(...,’BackgroundColor’,BG) (PNG only)
+[A,map,alpha] = imread(...) (PNG only)
+```
+
+举例 
+
+```matlab
+[X,map] = imread('flowers.tif',6); 
+info = imfinfo('skull.hdf');
+[X,map] = imread('skull.hdf',info(4).Reference); 
+bg = [255 0 0];
+A = imread('image.png','BackgroundColor',bg); 
+[A,map,alpha] = imread('image.png');
+```
+
+相关命令： 
+imfinfo, imwrite,fread,double,uint8,uint16
+
+## 64.imresize
+
+功能：改变图像大小。
+语法： 
+
+```matlab
+B = imresize(A,m,method)
+B = imresize(A,[mrows ncols],method) 
+B = imresize(...,method,n)
+B = imresize(...,method,h)
+```
+
+## 65.imrotate
+
+功能：旋转图像。
+语法： 
+
+```matlab
+B = imrotate(A,angle,method)
+B = imrotate(A,angle,method,'crop')
+```
+
+举例 
+
+```matlab
+I = imread('ic.tif');
+J = imrotate(I,–4,'bilinear','crop'); 
+imshow(I)
+figure, imshow(J)
+```
+
+![](https://raw.githubusercontent.com/timerring/scratchpad2023/main/2023/03/11-22-43-04-1678545781.png)
+
+相关命令：
+imcrop, imresize
+
+
+
+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)
+
+[返回首页](https://github.com/timerring/digital-image-processing-matlab)