can you explain me about these code?

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Tia
Tia 2013-3-31
if (nargin < 2 || nargin > 5)
mssim = -Inf;
ssim_map = -Inf;
return;
end
Thanks

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Image Analyst
Image Analyst 2013-3-31
It is code to assign some default return arguments for a function when the user does not pass in the expected number of input arguments.
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Yipeng Liu
Yipeng Liu 2013-4-19
Do you know why there are negative value in the ssim_map using the SSIM_index.m? It is not consistent to the paper description [0 1]. And how to transfer the ssim_map to [0 1]?
Thank you!

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