function?b?=?meanfilt2（varargin）
%MEDFILT2?Perform?2-D?median?filtering.
%???B?=?MEDFILT2（A[M?N]）?performs?median?filtering?of?the?matrix
%???A?in?two?dimensions.?Each?output?pixel?contains?the?median
%???value?in?the?M-by-N?neighborhood?around?the?corresponding
%???pixel?in?the?input?image.?MEDFILT2?pads?the?image?with?zeros
%???on?the?edges?so?the?median?values?for?the?points?within?
%???[M?N]/2?of?the?edges?may?appear?distorted.
%
%???B?=?MEDFILT2（A）?performs?median?filtering?of?the?matrix?A
%???using?the?default?3-by-3?neighborhood.
%
%???B?=?MEDFILT2（...PADOPT）?controls?how?the?matrix?boundaries
%???are?padded.??PADOPT?may?be?‘zeros‘?（the?default）
%???‘symmetric‘?or?‘indexed‘.?If?PADOPT?is?‘zeros‘?A?is?padded
%???with?zeros?at?the?boundaries.?If?PADOPT?is?‘symmetric‘?A?is
%???symmetrically?extended?at?the?boundaries.?If?PADOPT?is
%???‘indexed‘?A?is?padded?with?ones?if?it?is?double;?otherwise
%???it?is?padded?with?zeros.
%
%???Class?Support
%???-------------
%???The?input?image?A?can?be?logical?or?numeric?（unless?the?
%???‘indexed‘?syntax?is?used?in?which?case?A?cannot?be?of?class?
%???uint16）.??The?output?image?B?is?of?the?same?class?as?A.
%
%???Remarks
%???-------
%???If?the?input?image?A?is?of?integer?class?all?of?the?output
%???values?are?returned?as?integers.?If?the?number?of
%???pixels?in?the?neighborhood?（i.e.?M*N）?is?even?some?of?the
%???median?values?may?not?be?integers.?In?these?cases?the
%???fractional?parts?are?discarded.?Logical?input?is?treated
%???similarly.
%
%???Example
%???-------
%???????I?=?imread（‘eight.tif‘）;
%???????J?=?imnoise（I‘salt?&?pepper‘0.02）;
%???????K?=?medfilt2（J）;
%???????imview（J）?imview（K）
%
%???See?also?FILTER2?ORDFILT2?WIENER2.

%???Copyright?1993-2003?The?MathWorks?Inc.??
%???$Revision:?5.22?$??$Date:?2003/01/27?20:16:04?$

[a?mn?padopt]?=?parse_inputs（varargin{:}）;

domain?=?ones（mn）;
if?（rem（prod（mn）?2）?==?1）
????order?=?（prod（mn）+1）/2;
????b?=?ordfilt2（a?order?domain?padopt）;
else
????order1?=?prod（mn）/2;
????order2?=?order1+1;
????b?=?ordfilt2（a?order1?domain?padopt）;
????b2?=?ordfilt2（a?order2?domain?padopt）;
????idx?=?find（b?~=?b2）;
????b（idx）?=?（double（b（idx））?+?double（b2（idx）））/2;
end


%%%
%%%?Function?parse_inputs
%%%
function?[a?mn?padopt]?=?parse_inputs（varargin）
checknargin（14narginmfilename）;

%?There?are?several?grandfathered?syntaxes?we?have?to?catch
%?and?parse?successfully?so?we‘re?going?to?use?a?strategy
%?that‘s?a?little?different?that?usual.
%
%?First?scan?the?input?argument?list?for?strings.??The
%?string?‘indexed‘?‘zeros‘?or?‘symmetric‘?can?appear?basically
%?anywhere?after?the?first?argument.
%
%?Second?delete?the?strings?from?the?argument?list.
%
%?The?remaining?argument?list?can?be?one?of?the?following:
%?MEDFILT2（A）
%?MEDFILT2（A[M?N]）
%?MEDFILT2（A[M?N][Mb?Nb]）
%
%?Any?syntax?in?which?‘indexed‘?is?followed?by?other?arguments
%?is?grandfathered.??Any?sy

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????1012??2006-04-22?21:52??smooth.m

?????文件????????189??2005-05-30?10:08??zhongzhilvbo.m

?????文件????????388??2005-04-19?10:09??xbquzao.m

?????文件????????334??2005-06-04?18:04??wavelethardthreshold.m

?????文件????????290??2005-06-03?16:59??NMSE.m

?????文件????????350??2005-06-04?19:45??RMS.m

?????文件????????465??2006-08-08?20:46??psnr.m

?????文件???????4439??2005-06-04?19:18??meanfilt2.m

-----------?---------??----------?-----??----

?????????????????7467????????????????????8