How to read a large .img file

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Chad Greene
Chad Greene 2014-7-17
评论： Ashish Uthama 2014-7-18
I have a 4 GB image file that Matlab is choking on. I'd like to get this file into Matlab. Here is the code that makes my computer freeze:
fid=fopen('myimage.img','r','l');
M=fread(fid,[48333,41779],'uint16');
fclose(fid);
Equivalent code works well for a similar, smaller image, but this image is large. Subsetting into quadrants or sixteenths would be fine by me, but I don't know how to subset for a .img file. I know subsetting a tiff works with imread. Any suggestions for getting this big image into Matlab?

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José-Luis
José-Luis 2014-7-17
编辑：José-Luis 2014-7-17
Sounds like a job for memmapfile()
doc memmapfile
Alternatively, you could split your image beforehand.
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Chad Greene
Chad Greene 2014-7-17
Thanks for pointing me to memmapfile, José-Luis. This might just be the ticket.

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