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How to work with some part of matrix only?

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Hana
Hana 2015-8-7
关闭： MATLAB Answer Bot 2021-8-20
I have several tif images. their size is big and I get a memory error for that. Thats why I decieded to select a part of them and do my operation on that part only to avoid memory error.could this be a solution and how can I do it?
L = imread('lc60_4.tif');
s =imread('s240_4.tif');
c =imread('c240_4.tif');
S =imread('ts4_240.tif');
S5 =imread('td4_240.tif');
[x,y] = size(L);

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回答（2 个）

VIJENDRA
VIJENDRA 2015-8-7
you can use 'imcrop' to crop some part of the image.
croppedIm = imcrop(yourImage);
Walter Roberson
Walter Roberson 2015-8-7
Depending on what you are doing, you may be able to use the "src_filename" version of blockproc()
imcrop() is the same thing as indexing the image array to extract a portion of it: it still requires that you read in the entire image.
With TIFF files, if your image has been created the right way, you may be able to use the TIFF Class to read "tiles": see http://www.mathworks.com/help/matlab/ref/tiff.readencodedtile.html

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