how to crop multiple files

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yogesh jain
yogesh jain 2015-10-12
评论： Walter Roberson 2016-9-29
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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Stalin Samuel
Stalin Samuel 2015-10-12
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
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
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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