opening a .rec file

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richard 2014-8-27

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评论： Image Analyst 2014-8-28

I have a .rec file which is supposed to be a reconstructed SPECT image of a point source. I am trying to open it up in matlab.

I have usually used the following generic way of opening image data files in matlab:

fid = fopen('filename.ext','r');
A = fread(fid,sizeA,precision);
imagesc(A)
colormap('gray')
axis image off

but this block of code does not open my .rec file in this case. It simply returns a blank gray screen with no image. I was told something about specifying the file format, but I'm not sure how to do this.

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richard 2014-8-28

The A matrix is zero so as a result there are x's only at zero...

Image Analyst 2014-8-28

Attach your image and code to read it so we can (perhaps) try to fix it.

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回答（1 个）

Image Analyst 2014-8-27

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在 MATLAB Online 中打开

Richard,

No, precision would be something like '*uint8'. What you called precision is actually "sizeA" and would be sizeA = [45, 45]. So try

sizeA = [45, 45];
precision = '*uint8';
A = fread(fid,sizeA,precision);
imshow(A, [])
colormap('gray');
axis on;

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richard 2014-8-27

ReadData3D.m

Yea I tried changing the machine format to all those listed, the matrix I get for A is still all zeroes... do you think that this attachment would get me where I need to be? I got the M-file from this url: http://www.mathworks.com/matlabcentral/fileexchange/29344-read-medical-data-3d/content/ReadData3D.m

Image Analyst 2014-8-27

It may. Looks like you need the fig file also since it's a GUIDE file. Try reading in A as bytes, or just opening it in notepad. Is it all zeros if you use either of those? If so, then the file actually is all zeros for some reason.

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