%?PHASECONG?-?Computes?phase?congruency?on?an?image.
%
%?Usage:?[pc?or?ft]?=?phasecong（im）
%
%?This?function?calculates?the?PC_2?measure?of?phase?congruency.??
%?For?maximum?speed?the?input?image?should?be?square?and?have?a?
%?size?that?is?a?power?of?2?but?the?code?will?operate?on?images
%?of?arbitrary?size.??
%
%
%?Returned?values:
%?????????????????pc?-?Phase?congruency?image?（values?between?0?and?1）???
%?????????????????or?-?Orientation?image.??Provides?orientation?in?which?
%??????????????????????local?energy?is?a?maximum?in?in?degrees?（0-180）?
%??????????????????????angles?positive?anti-clockwise.
%?????????????????ft?-?A?complex?valued?image?giving?the?weighted?mean?
%??????????????????????phase?angle?at?every?point?in?the?image?for?the?
%??????????????????????orientation?having?maximum?energy.??Use?the
%??????????????????????function?DISPFEAT?to?display?this?data.
%
%?Parameters:??
%?????????????????im?-?A?greyscale?image?to?be?processed.
%?????????????????
%?You?can?also?specify?numerous?optional?parameters.??See?the?code?to?find
%?out?what?they?are.??The?convolutions?are?done?via?the?FFT.??Many?of?the
%?parameters?relate?to?the?specification?of?the?filters?in?the?frequency
%?plane.??Default?values?for?parameters?are?set?within?the?file?rather?than
%?being?required?as?arguments?because?they?rarely?need?to?be?changed?-?nor
%?are?they?very?critical.??However?you?may?want?to?experiment?with
%?specifying/editing?the?values?of?‘nscales‘?and?‘noiseCompFactor‘.
%
%?Note?this?phase?congruency?code?is?very?computationally?expensive?and?uses
%?*lots*?of?memory.
%
%
%?Example?MATLAB?session:
%
%?>>?im?=?imread（‘picci.tif‘）;???
%?>>?image（im）;??????????????????????????%?Display?the?image
%?>>?[pc?or?ft]?=?phasecong（im）;
%?>>?imagesc（pc）?colormap（gray）;????????%?Display?the?phase?congruency?image
%
%
%?To?convert?the?phase?congruency?image?to?an?edge?map?（with?my?usual?parameters）:
%
%?>>?nm?=?nonmaxsup（pc?or?1.5）;????????%?Non-maxima?suppression.??
%????The?parameter?1.5?can?result?in?edges?more?than?1?pixel?wide?but?helps
%????in?picking?up?‘broad‘?maxima.
%?>>?edgim?=?hysthresh（nm?0.4?0.2）;????%?Hysteresis?thresholding.
%?>>?edgeim?=?bwmorph（edgim‘skel‘Inf）;?%?Skeletonize?the?edgemap?to?fix
%????????????????????????????????????????%?the?non-maximal?suppression.
%?>>?imagesc（edgeim）?colormap（gray）;
%
%
%?To?display?the?different?feature?types?present?in?your?image?use:
%
%?>>?dispfeat（ftedgim）;
%
%?With?a?small?amount?of?editing?the?code?can?be?modified?to?calculate
%?a?dimensionless?measure?of?local?symmetry?in?the?image.??The?basis
%?of?this?is?that?one?looks?for?points?in?the?image?where?the?local?
%?phase?is?90?or?270?degrees?（the?symmetric?points?in?the?cycle）.
%?Editing?instructions?are?within?the?code.
%
%?Notes?on?filter?settings?to?obtain?even?coverage?of?the?spectrum
%?dthetaOnSigma?1.5
%?sigmaOnf??.85???mult?1.3
%?sigmaOnf??.75???mult?1.6?????（bandwidth?~1?octave）
%?sigmaOnf??.65???mult?2.1??
%?sigmaOnf??.55???mult?3???????（ba

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2012-04-10?18:35??phasecong1\
?????文件??????179920??2011-11-22?09:34??phasecong1\Baboon.jpg
?????文件???????49206??2006-12-04?11:01??phasecong1\hua.bmp
?????文件???????16644??2006-09-08?10:22??phasecong1\phasecong.m
?????文件?????????303??2012-03-19?16:58??phasecong1\phasecong_edge1.asv
?????文件?????????303??2012-03-19?16:58??phasecong1\phasecong_edge1.m
?????文件????????5632??2007-03-19?19:17??phasecong1\Thumbs.db
?????文件???????17464??2002-06-10?16:59??phasecong1\WORD.BMP