How to read large tiff or img file?

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

Answer 1

[Chad Greene]

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});

Answer 2

[Image Analyst]

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.

[Hana]

I should have them all at one time as they are the input to my algorithm.

[Image Analyst]

Then read this or get more RAM memory in your computer. Or else subsample your images. There's a good chance you can do what you need to do (find areas of blobs or whatever) using smaller versions of the images.

[Hana]

Is it possible to read the images line by line?

[Image Analyst]

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?