function?y?=?conv_fft2（x?m?shape）
%CONV_FFT2?Two?dimensional?convolution?via?the?FFT.
%???Y?=?CONV_FFT2（X?M）?performs?the?2-D?convolution?of?matrices?X?and?M.
%???If?[mxnx]?=?size（X）?and?[mmnm]?=?size（M）?then?size（Y）?=
%???[mx+mm-1nx+nm-1].?Values?near?the?boundaries?of?the?output?array?are
%???calculated?as?if?X?was?surrounded?by?a?border?of?zero?values.
%
%???Y?=?CONV_FFT2（X?M?SHAPE）?where?SHAPE?is?a?string?returns?a
%???subsection?of?the?2-D?convolution?with?size?specified?by?SHAPE:
%
%???????‘full‘????-?（default）?returns?the?full?2-D?convolution
%???????‘same‘????-?returns?the?central?part?of?the?convolution
%???????????????????that?is?the?same?size?as?X?（using?zero?padding）
%???????‘valid‘???-?returns?only?those?parts?of?the?convolution
%???????????????????that?are?computed?without?the?zero-padded
%???????????????????edges?size（Y）?=?[mx-mm+1nx-nm+1]?when
%???????????????????size（X）?>?size（M）
%???????‘wrap‘????-?as?for?‘same‘?except?that?instead?of?using
%???????????????????zero-padding?the?input?X?is?taken?to?wrap?round?as
%???????????????????on?a?toroid.
%???????‘reflect‘?-?as?for?‘same‘?except?that?instead?of?using
%???????????????????zero-padding?the?input?X?is?taken?to?be?reflected
%???????????????????at?its?boundaries.
%
%???For?shape?options?‘full‘?‘same‘?and?‘valid‘?this?function?should
%???return?the?same?result?as?CONV2?to?within?a?small?tolerance.?For?all
%???shape?options?this?function?should?return?the?same?result?as?CONVOLVE2
%???（available?via?the?MATLAB?Central?File?Exchange）?with?no?TOL?argument
%???to?within?a?small?tolerance.
%
%???CONV_FFT2?uses?multiplication?in?the?frequency?domain?to?compute?the
%???convolution.?It?may?be?faster?than?CONV2?and?CONVOLVE2?for?masks?above
%???a?certain?size.?This?should?be?checked?experimentally?for?any?given
%???application?and?system.
%
%???See?also?CONV2?CONVOLVE2?FILTER2.

%?Copyright?David?Young?April?2011

error（nargchk（23nargin‘struct‘））;
if?nargin?????shape?=?‘full‘;????%?shape?default?as?for?CONV2
end;

[x?m?fsize]?=?padarrays（x?m?shape）;

%?no?need?to?trap?case?of?real?x?and?m?-?fft2?handles?efficiently
y?=?ifft2（fft2（x）?.*?fft2（m））;???%?central?operation?basic?form

%?trim?to?correct?output?size
if?~isequal（fsize?size（y））
????y?=?y（1:fsize（1）?1:fsize（2））;
end

end

function?[x?m?fsize]?=?padarrays（x?m?shape）
%?Pad?arrays?to?make?them?the?same?size?and?allow?for?boundary?effects

xsize?=?size（x）;
msize?=?size（m）;

switch?shape
????
????case?‘wrap‘
????????fsize?=?xsize;
????????%?ensure?x?no?smaller?than?m
????????if?any（msize?>?xsize）??&&?~isempty（x）
????????????x?=?repmat（x?ceil（msize?./?size（x）））;
????????????xsize?=?size（x）;
????????end
????????%?pad?m?with?zeros
????????if?any（msize?????????????m?=?exindex（m?1:xsize（1）?1:xsize（2）?{0}）;
????????end
????????%?recentre?m?so?that?y（11）?corresponds?to?mask?cen

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----

?????文件????2991924??2014-08-01?22:54??CFFTW\CFFTWWrapper.zip

?????文件??????12123??2014-08-02?23:11??CFFTW\conv?–?Convolution?—?Theano?0.6?documentation.htm

?????文件???????6620??2014-08-02?23:11??CFFTW\conv?–?Convolution?—?Theano?0.6?documentation_files\doctools.js

?????文件??????40219??2014-08-02?23:11??CFFTW\conv?–?Convolution?—?Theano?0.6?documentation_files\ga.js

?????文件??????93868??2014-08-02?23:11??CFFTW\conv?–?Convolution?—?Theano?0.6?documentation_files\jquery.js

?????文件???????3932??2014-08-02?23:11??CFFTW\conv?–?Convolution?—?Theano?0.6?documentation_files\pygments.css

?????文件???????6086??2014-08-02?23:11??CFFTW\conv?–?Convolution?—?Theano?0.6?documentation_files\sphinxdoc.css

?????文件???????4621??2014-08-02?23:11??CFFTW\conv?–?Convolution?—?Theano?0.6?documentation_files\theano_logo_allblue_200x46.png

?????文件??????12140??2014-08-02?23:11??CFFTW\conv?–?Convolution?—?Theano?0.6?documentation_files\underscore.js

?????文件???????4730??2014-02-12?13:27??CFFTW\conv_fft2\conv_fft2.m

?????文件???????9835??2014-02-12?13:27??CFFTW\conv_fft2\exindex.m

?????文件???????1343??2014-02-12?13:27??CFFTW\conv_fft2\license.txt

?????文件??????35623??2014-08-02?22:52??CFFTW\documentation.html

?????文件?????861581??2014-08-02?22:15??CFFTW\precompiledFFTW.zip

?????文件??????69503??2014-08-02?23:02??CFFTW\python\astropy.nddata.convolution.convolve?—?Astropy?v0.2.htm

?????文件???????3377??2014-08-02?23:02??CFFTW\python\astropy.nddata.convolution.convolve?—?Astropy?v0.2_files\badge_only.css

?????文件??????10484??2014-08-02?23:02??CFFTW\python\astropy.nddata.convolution.convolve?—?Astropy?v0.2_files\bootstrap-astropy.css

?????文件???????6686??2014-08-02?23:02??CFFTW\python\astropy.nddata.convolution.convolve?—?Astropy?v0.2_files\doctools.js

?????文件??????40219??2014-08-02?23:02??CFFTW\python\astropy.nddata.convolution.convolve?—?Astropy?v0.2_files\ga.js

?????文件??????83611??2014-08-02?23:02??CFFTW\python\astropy.nddata.convolution.convolve?—?Astropy?v0.2_files\jquery-2.0.3.min.js

?????文件???????7199??2014-08-02?23:02??CFFTW\python\astropy.nddata.convolution.convolve?—?Astropy?v0.2_files\jquery-migrate-1.2.1.min.js

?????文件???????3932??2014-08-02?23:02??CFFTW\python\astropy.nddata.convolution.convolve?—?Astropy?v0.2_files\pygments.css

?????文件????????212??2014-08-02?23:02??CFFTW\python\astropy.nddata.convolution.convolve?—?Astropy?v0.2_files\readthedocs-doc-embed.css

?????文件???????9146??2014-08-02?23:02??CFFTW\python\astropy.nddata.convolution.convolve?—?Astropy?v0.2_files\readthedocs-doc-embed.js

?????文件???????4971??2014-08-02?23:02??CFFTW\python\astropy.nddata.convolution.convolve?—?Astropy?v0.2_files\sidebar.js

?????文件??????12140??2014-08-02?23:02??CFFTW\python\astropy.nddata.convolution.convolve?—?Astropy?v0.2_files\underscore.js

?????文件??????27668??2014-08-02?23:03??CFFTW\python\convolve_fft?—?Astropy?v0.2.htm

?????文件???????3377??2014-08-02?23:03??CFFTW\python\convolve_fft?—?Astropy?v0.2_files\badge_only.css

?????文件??????10484??2014-08-02?23:03??CFFTW\python\convolve_fft?—?Astropy?v0.2_files\bootstrap-astropy.css

?????文件???????6686??2014-08-02?23:03??CFFTW\python\convolve_fft?—?Astropy?v0.2_files\doctools.js

............此處省略21個(gè)文件信息