can you explain me about these code?

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

Thanks

Answer 1

[Image Analyst]

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.

[Tia]

-Inf, what is it?

[Image Analyst]

Negative infinity.

[Tia]

oh..i got it.thanks

[Image Analyst]

Great.

[Yipeng Liu]

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!