Save SSIM index output

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Angela
Angela on 15 Sep 2018
Commented: Image Analyst on 15 Sep 2018
I have 2 images (A,B) that i want to compare using the SSIM Index. I am using the command
[ssimval, ssimmap] = ssim(A,B);
imshow(ssimmap,[])
When i plot ssimmap i can see the different structures. When i save the ssimmap and then read the image:
imwrite(ssimmap,'test.jp2','Mode','lossless')
NewImage=imread('test.jp2')
When i plot 'NewImage' it looks all flat, it is different than 'ssimmap'. Is there something different about 'ssimmap' that it has to be saved in a special way? I want to be able to save ssimmap as an output file.

Accepted Answer

KALYAN ACHARJYA
KALYAN ACHARJYA on 15 Sep 2018
%Try
[ssimval, ssimmap]=ssim(A,B);
imshow(ssimmap,[]);
saveas(gcf,'test.jpg');
NewImage=imread('test.jpg');
  2 Comments
Angela
Angela on 15 Sep 2018
Thank you! It works really well. The only problem is the 'NewImage' has an added white border around it (the ssimmap does not have that), do you know if this is a feature of the 'saveas' or it can be removed? I usually use imwrite and i never have this issue. Thank you again.
Image Analyst
Image Analyst on 15 Sep 2018
saveas() saves the whole figure. Use imwrite to save just the image
imwrite(ssimmap, 'ssimmap.png');

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