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Structural similarity for RGB image

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MD RESHAD UL HOQUE
MD RESHAD UL HOQUE 2019-5-17
回答： D.Regan 2021-12-1
I want to calculate the structural similarity between two RGB images. I was using Matlab built-in command ssim but got an error message.
Is there anything I need to do or other command for RGB image structural similarity??
My attempts and error message :
ssim(image11,a1) %% image11, a1 two RGB image. Image dimension 256x256x3
"Error using conv2
N-D arrays are not supported.
Error in filter2 (line 59)
y = conv2(hcol, hrow, x, shape);
Error in ssim (line 188)
mu1 = filter2(window, img1, 'valid');

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回答（2 个）

vidhathri bhat
vidhathri bhat 2019-5-28
Hi,
ssim function in matlab does not support RGB images. You will have to convert both images to greyscale image.
D.Regan
D.Regan 2021-12-1
Hello,
SSIM is not intended to RGB images directly. To calculate SSIM here, convert RGB to YCbCr then follow the 0.8SSIMY + 0.1SSIMCr + 0.1SSIMCb.
For Ref:
https://arxiv.org/pdf/2006.13846.pdf
Hope this will help you better.

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