function?ssim??=??cal_ssim（?im1?im2?b_row?b_col?）

[h?w?ch]??=??size（?im1?）;
ssim??=?0;
if?ch==1
????ssim???=?ssim_index（?im1（b_row+1:h-b_row?b_col+1:w-b_col）?im2（?b_row+1:h-b_row?b_col+1:w-b_col）?）;
else
????for?i?=?1:ch
????????ssim???=?ssim?+?ssim_index（?im1（b_row+1:h-b_row?b_col+1:w-b_col?i）?im2（?b_row+1:h-b_row?b_col+1:w-b_col?i）?）;
????end
????ssim???=??ssim/ch;
end
return;




function?[mssim?ssim_map]?=?ssim_index（img1?img2?K?window?L）

%========================================================================
%SSIM?Index?Version?1.0
%Copyright（c）?2003?Zhou?Wang
%All?Rights?Reserved.
%
%The?author?was?with?Howard?Hughes?Medical?Institute?and?Laboratory
%for?Computational?Vision?at?Center?for?Neural?Science?and?Courant
%Institute?of?Mathematical?Sciences?New?York?University?USA.?He?is
%currently?with?Department?of?Electrical?and?Computer?Engineering
%University?of?Waterloo?Canada.
%
%----------------------------------------------------------------------
%Permission?to?use?copy?or?modify?this?software?and?its?documentation
%for?educational?and?research?purposes?only?and?without?fee?is?hereby
%granted?provided?that?this?copyright?notice?and?the?original?authors‘
%names?appear?on?all?copies?and?supporting?documentation.?This?program
%shall?not?be?used?rewritten?or?adapted?as?the?basis?of?a?commercial
%software?or?hardware?product?without?first?obtaining?permission?of?the
%authors.?The?authors?make?no?representations?about?the?suitability?of
%this?software?for?any?purpose.?It?is?provided?“as?is“?without?express
%or?implied?warranty.
%----------------------------------------------------------------------
%
%This?is?an?implementation?of?the?algorithm?for?calculating?the
%Structural?SIMilarity?（SSIM）?index?between?two?images.?Please?refer
%to?the?following?paper:
%
%Z.?Wang?A.?C.?Bovik?H.?R.?Sheikh?and?E.?P.?Simoncelli?“Image
%quality?assessment:?From?error?measurement?to?structural?similarity“
%IEEE?Transactios?on?Image?Processing?vol.?13?no.?4?Apr.?2004.
%
%Kindly?report?any?suggestions?or?corrections?to?zhouwang@ieee.org
%
%----------------------------------------------------------------------
%
%Input?:?（1）?img1:?the?first?image?being?compared
%????????（2）?img2:?the?second?image?being?compared
%????????（3）?K:?constants?in?the?SSIM?index?formula?（see?the?above
%????????????reference）.?defualt?value:?K?=?[0.01?0.03]
%????????（4）?window:?local?window?for?statistics?（see?the?above
%????????????reference）.?default?widnow?is?Gaussian?given?by
%????????????window?=?fspecial（‘gaussian‘?11?1.5）;
%????????（5）?L:?dynamic?range?of?the?images.?default:?L?=?255
%
%Output:?（1）?mssim:?the?mean?SSIM?index?value?between?2?images.
%????????????If?one?of?the?images?being?compared?is?regarded?as?
%????????????perfect?quality?then?mssim?can?be?considered?as?the
%????????????quality?measure?of?the?other?image.
%????????????If?img1?=?img2?then?mssim?=?1.
%???????

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件????????1181??2020-06-07?19:49??SpectAngMapper.m
?????文件????????6373??2020-06-07?19:49??cal_ssim.m
?????文件?????????645??2020-11-27?17:42??compare.m
?????文件?????????396??2020-06-07?19:49??csnr.m
?????文件????????4180??2020-06-07?19:49??img_qi.m
?????文件????????3128??2020-11-26?17:12??quality_assessment.m
?????文件?????????999??2020-06-07?19:49??CC.m