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How to read large tiff or img file?

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Hana
Hana 2015-4-11
评论： Image Analyst 2015-4-11
My files are huge with [12200,5010] rows and column. I read them in the following format:
fid=fopen('lc60_4.img','r'); LU=fread(fid,[12200,5010]); fclose(fid)
LA=imread('lai4_240.tif');
As I have 8 image to read matlab cant handle this. How can I solve this problem? Thanks

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采纳的回答

Chad Greene
Chad Greene 2015-4-11
If you don't need the whole image, you can specify a region of pixels by range of rows and columns:
A=imread(filename,'PixelRegion',{rows cols});

更多回答（1 个）

Image Analyst
Image Analyst 2015-4-11
Don't have them all in memory at one time. Just process one image at a time.
One file is not really all that huge. If it's a uint8 image, that's about 61 MB - about the size of a typical color digital photo. Eight of them is getting up there particularly if you're using some other temporary images along the way. You might use clear() to delete any scratch/temporary variables as soon as you're done with them to free up memory.
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Hana
Hana 2015-4-11
Is it possible to read the images line by line?
Image Analyst
Image Analyst 2015-4-11
Yes, but when I suggested to read them image by image you said no. So if image by image is no good, then how is line by line going to work?

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