write (save) an image file

2014 1 31
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更新时间：2015 3 12
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i had a .mha file, i used the below two lines to display the image and i get the first full image as in the link below....
V = mha_read_volume('BRATS_HG0001_truth.mha');
imshow(squeeze(V(:,:,round(end/2))),[]);
please can someone help me how to save that image to a jpg or bmp or tiff file....
i tried
imwrite(squeeze(V(:,:,round(end/2))),'filename.bmp')
but i'm not getting the image... i get the outline of the image as shown in link (image(b))... what should i do to save as image(a)
http://imageshack.com/a/img838/8308/yc91.png

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 采纳的回答

Walter Roberson
Walter Roberson 2014-1-31

1 个投票

Notice that when you call imshow you are providing the [] second parameter. That tells imshow() to effectively shift and scale the data so that it runs between 0 and 1. You can do the same tranformation:
newimage = squeeze(V(:,:,round(end/2)));
minimage = min(newimage(:));
maximage = max(newimage(:));
scaledimage = (newimage - minimage) ./ (maximage - minimage);
imwrite(scaledimage, 'filename.bmp');

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Elysi Cochin
Elysi Cochin 2014-1-31
sir when i did so i got the below error
??? Error using ==> writebmp at 16
Class of X must be logical, uint8, single, or double.
Error in ==> imwrite at 431
feval(fmt_s.write, data, map, filename, paramPairs{:});
Error in ==> Demo at 10
imwrite(scaledimage, 'filename.bmp');
so i edited the line to
scaledimage = uint8((newimage - minimage) ./ (maximage - minimage));
but that time when i write i get a fully black image and nothing else....
how to correct the above error....
Image Analyst
Image Analyst 2014-1-31
Try casting everything to double to do the math, then cast back to uint8 inside the call to imwrite().
Elysi Cochin
Elysi Cochin 2014-1-31
now it worked... thank you Walter Roberson and Image Analyst for your help....
Syed Mobashir
Syed Mobashir 2015-3-12
i am also getting the same black image. can you tell me this code? plzzz i need this urgent

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