can you explain me about these code?

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if (nargin < 2 || nargin > 5)
mssim = -Inf;
ssim_map = -Inf;

Accepted Answer

Image Analyst
Image Analyst on 31 Mar 2013
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.
Yipeng Liu
Yipeng Liu on 19 Apr 2013
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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