how to crop multiple files

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yogesh jain 2015-10-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/248107-how-to-crop-multiple-files

评论： Walter Roberson 2016-9-29

采纳的回答： Stalin Samuel

在 MATLAB Online 中打开

hello guys , worked on triangular mask cropping of a DICOM image , here is the code -

 clear all
 I=dicomread('four.dcm');
 I=uint16(I);
 g=imshow(I,[0 600]);
 axis on 
 [x,y]=ginput(3);
 h = impoly(gca, [x,y]);
 pos = wait(h);
 BW = createMask(h,g);
 BW=uint16(BW);
 J=I.*BW;
 figure,imshow(J,[0 600]);

I just want to perform this task on multiple DICOM images . used for loop but createMask is showing error about cell type data variables . what will be the approach ? please suggest me . Thank you

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Walter Roberson 2015-10-12

Please show your attempt with a for loop.

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Stalin Samuel 2015-10-12

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/248107-how-to-crop-multiple-files#answer_195608

在 MATLAB Online 中打开

for i = 1:length(fileList)
 I=dicomread(fileList{i}); %fileList contains names of all dicom images
 I=uint16(I);
 g=imshow(I,[0 600]);
 axis on 
 [x,y]=ginput(3);
 h = impoly(gca, [x,y]);
 pos = wait(h);
 BW = createMask(h,g);
 BW=uint16(BW);
 J=I.*BW;
 figure,imshow(J,[0 600]);
end

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Sara Salimi 2016-9-29

编辑：Sara Salimi 2016-9-29

Dear Walter, thank you very much.

Question: Does cropping affect the processing and and the performance of process/calculation? I mean smoothing or derivatives?

Thanks again

Walter Roberson 2016-9-29

Generally speaking, operating on smaller matrices is faster, but for reasonably sized arrays operations like smoothing a sobel filters are pretty quick. Cropping is usually used to remove irrelevant information -- if you know that something is not part of the interesting part of the image, it is confusing to region find on it (for example might be text labels.)

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