function?[PSNR?y_est]?=?BM3D（y?z?sigma?profile?print_to_screen）

%??代碼的模板基于http://www.cs.tut.fi/~foi/GCF-BM3D此網址提供的BM3D.m，
%??此文件將原文件中bm3d_thr和bm3d_wiener兩個函數用matlab語言進行了實現，并附在最后，
%??由于原文件有些參數并未體現在論文思想中，這一情況同樣體現在原文件的bm3d_thr和bm3d_wiener兩個函數上，
%??又或者是我理解的偏差，導致編寫的bm3d_thr和bm3d_wiener兩個函數有部分參數并未用到，不過不影響函數使用，
%??另外，在調試過程中也為了提高PSNR，修改了部分參數，
%??此文件使用時，將預處理的圖像與此文件放在同一個文件夾下，修改image_name（100行左右）使其與圖像文件名一致，
%??可通過修改約位于128行的sigma修改方差
%??另外，也許是由于算法問題，此文件處理圖像較慢，256x256需要2到3分鐘，512x512需要8到15分鐘，還請注意
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%??BM3D?is?algorithm?for?attenuation?of?additive?white?Gaussian?noise?from?
%??grayscale?images.?This?algorithm?reproduces?the?results?from?the?article:
%
%??[1]?K.?Dabov?A.?Foi?V.?Katkovnik?and?K.?Egiazarian?“Image?denoising?
%???by?sparse?3D?transform-domain?collaborative?filtering“?
%???IEEE?Transactions?on?Image?Processing?December?2006?in?review
%???preprint?at?http://www.cs.tut.fi/~foi/GCF-BM3D.
%
%??FUNCTION?INTERFACE:
%
%??[PSNR?y_est]?=?BM3D（y?z?sigma?profile?print_to_screen）
%
%??!?The?function?can?work?without?any?of?the?input?arguments?
%???in?which?case?the?internal?default?ones?are?used?!
%?
%??BASIC?USAGE?EXAMPLES:
%
%?????Case?1）?Using?the?default?parameters?（i.e.?image?name?sigma?etc.）
%?
%??????[PSNR?y_est]?=?BM3D;
%?
%?????Case?2）?Using?an?external?noisy?image:
%
%??????%?Read?a?grayscale?image?and?scale?its?intensities?in?range?[01]
%??????y?=?im2double（imread（‘Cameraman256.png‘））;?
%??????%?Generate?the?same?seed?used?in?the?experimental?results?of?[1]
%??????randn（‘seed‘?0）;
%??????%?Standard?deviation?of?the?noise?---?corresponding?to?intensity?
%??????%??range?[0255]?despite?that?the?input?was?scaled?in?[01]
%??????sigma?=?25;
%??????%?Add?the?AWGN?with?zero?mean?and?standard?deviation?‘sigma‘
%??????z?=?y?+?（sigma/255）*randn（size（y））;
%??????%?Denoise?‘z‘.?The?denoised?image?is?‘y_est‘?and?‘NA?=?1‘?because?
%??????%??the?true?image?was?not?provided
%??????[NA?y_est]?=?BM3D（1?z?sigma）;?
%??????%?Compute?the?putput?PSNR
%??????PSNR?=?10*log10（1/mean（（y（:）-y_est（:））.^2））
%??????%?show?the?noisy?image?‘z‘?and?the?denoised?‘y_est‘
%??????figure;?imshow（z）;???
%??????figure;?imshow（y_est）;
%?
%?????Case?3）?If?the?original?image?y?is?provided?as?the?first?input?
%??????argument?then?some?additional?information?is?printed?（PSNRs?
%??????figures?etc.）.?That?is?“[NA?y_est]?=?BM3D（1?z?sigma）;“?in?the
%??????above?code?should?be?replaced?with:
%?
%??????[PSNR?y_est]?=?BM3D（y?z?sigma）;
%?
%?
%??INPUT?ARGUMENTS?（OPTIONAL）:
%
%?????1）?y?（matrix?M?x?N）:?Noise-free?image?（needed?for?computing?PSNR）
%???????????????????????????replace?with?the?scalar?1?if?not?available.
%?????2）?z?（matrix?M?x?N）:?Noisy?image?（intensities?in?range?[01]?or?[0255]）
%?????3）?sigma?（double）??:?Std.?dev.?of?the?noise?（corresponding?to?intensities
%??????????????????????????in?range?[0255]?even?if?the?range?of?z?is?[01]）
%?????4）?profile?（char）??:?‘np‘?-->?

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2019-04-08?20:21??BM3D\
?????文件????????6148??2019-04-08?20:21??BM3D\.DS_Store
?????目錄???????????0??2019-04-08?20:22??__MACOSX\
?????目錄???????????0??2019-04-08?20:22??__MACOSX\BM3D\
?????文件?????????120??2019-04-08?20:21??__MACOSX\BM3D\._.DS_Store
?????文件???????32050??2019-04-03?20:02??BM3D\BM3D.m
?????文件?????????232??2019-04-03?20:02??__MACOSX\BM3D\._BM3D.m
?????目錄???????????0??2019-04-03?20:00??BM3D\BM3D_images\
?????文件??????177762??2005-11-14?08:14??BM3D\BM3D_images\boat.png
?????目錄???????????0??2019-04-08?20:22??__MACOSX\BM3D\BM3D_images\
?????文件?????????212??2005-11-14?08:14??__MACOSX\BM3D\BM3D_images\._boat.png
?????文件???????33216??2006-12-30?12:59??BM3D\BM3D_images\montage.png
?????文件?????????212??2006-12-30?12:59??__MACOSX\BM3D\BM3D_images\._montage.png
?????文件??????429132??2005-12-08?11:21??BM3D\BM3D_images\image_F16_512rgb.png
?????文件?????????212??2005-12-08?11:21??__MACOSX\BM3D\BM3D_images\._image_F16_512rgb.png
?????文件??????476195??2005-10-29?12:18??BM3D\BM3D_images\image_Lena512rgb.png
?????文件?????????212??2005-10-29?12:18??__MACOSX\BM3D\BM3D_images\._image_Lena512rgb.png
?????文件??????185727??2005-11-14?08:14??BM3D\BM3D_images\barbara.png
?????文件?????????212??2005-11-14?08:14??__MACOSX\BM3D\BM3D_images\._barbara.png
?????文件??????110937??2005-10-29?12:19??BM3D\BM3D_images\image_House256rgb.png
?????文件?????????212??2005-10-29?12:19??__MACOSX\BM3D\BM3D_images\._image_House256rgb.png
?????文件???????37559??2006-04-17?11:20??BM3D\BM3D_images\Cameraman256.png
?????文件?????????212??2006-04-17?11:20??__MACOSX\BM3D\BM3D_images\._Cameraman256.png
?????文件???????34985??2005-11-14?08:14??BM3D\BM3D_images\house.png
?????文件?????????212??2005-11-14?08:14??__MACOSX\BM3D\BM3D_images\._house.png
?????文件??????153785??2006-04-17?11:20??BM3D\BM3D_images\Lena512.png
?????文件?????????212??2006-04-17?11:20??__MACOSX\BM3D\BM3D_images\._Lena512.png
?????文件??????184561??2006-06-06?20:48??BM3D\BM3D_images\fingerprint.png
?????文件?????????212??2006-06-06?20:48??__MACOSX\BM3D\BM3D_images\._fingerprint.png
?????文件??????209817??2006-12-30?12:53??BM3D\BM3D_images\man.png
?????文件?????????212??2006-12-30?12:53??__MACOSX\BM3D\BM3D_images\._man.png
............此處省略13個文件信息