pca sift matlab代码 以及详细介绍

pca sift matlab代码 另外附带pca代码以及详细介绍

function [meanvec P] = pca（fn numcomps）
patchsize = 41;
patchlen = patchsize*patchsize;

if nargin < 2
   error（ ‘Not enough input arguments.‘ ）;
end

disp（‘Reading patch file.‘）;

fid = fopen（fn ‘r‘）;
array = fscanf（fid ‘%d‘ [patchlen inf]）;

disp（‘Computing covariance matrix‘）;
meanvec = mean（array 2）;
meanarray = repmat（meanvec 1 size（array2））;
A = array-meanarray;
covA = A*A‘;

disp（‘Computing principle components.‘）;
[V D] = eig（covA）;

P = V（: （size（V 2） - numcomps + 1） : size（V 2））;
P = fliplr（P）;

figure（3）;
plot（flipud（diag（D）））;

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

     文件      31538  2007-08-29 23:45  PCA-SIFT代码\pca-sift\pcasift-0.91nd\aclocal.m4

     文件         19  2004-01-27 06:24  PCA-SIFT代码\pca-sift\pcasift-0.91nd\AUTHORS

     文件          0  2004-01-27 06:24  PCA-SIFT代码\pca-sift\pcasift-0.91nd\ChangeLog

     文件        557  2007-08-29 23:45  PCA-SIFT代码\pca-sift\pcasift-0.91nd\config.h.in

     文件     144899  2007-08-29 23:45  PCA-SIFT代码\pca-sift\pcasift-0.91nd\configure

     文件        573  2004-03-22 10:31  PCA-SIFT代码\pca-sift\pcasift-0.91nd\configure.ac

     文件       1887  2004-01-27 06:24  PCA-SIFT代码\pca-sift\pcasift-0.91nd\COPYING

     文件      12123  2004-01-27 06:24  PCA-SIFT代码\pca-sift\pcasift-0.91nd\depcomp

     文件         90  2004-01-27 06:24  PCA-SIFT代码\pca-sift\pcasift-0.91nd\docs\README

     文件       7843  2004-01-27 06:24  PCA-SIFT代码\pca-sift\pcasift-0.91nd\Doxyfile

     文件       1473  2004-04-23 10:39  PCA-SIFT代码\pca-sift\pcasift-0.91nd\gathergrads.cc

     文件        921  2004-04-23 10:39  PCA-SIFT代码\pca-sift\pcasift-0.91nd\getpatches.cc

     文件    1806948  2004-01-27 06:24  PCA-SIFT代码\pca-sift\pcasift-0.91nd\gpcavects.txt

     文件      10435  2007-08-29 23:43  PCA-SIFT代码\pca-sift\pcasift-0.91nd\image.cc

     文件       3224  2004-01-27 06:24  PCA-SIFT代码\pca-sift\pcasift-0.91nd\image.h

     文件       9236  2004-01-27 06:24  PCA-SIFT代码\pca-sift\pcasift-0.91nd\INSTALL

     文件       5569  2004-01-27 06:24  PCA-SIFT代码\pca-sift\pcasift-0.91nd\install-sh

     文件      18019  2004-06-06 11:49  PCA-SIFT代码\pca-sift\pcasift-0.91nd\keypoint.cc

     文件       6915  2004-04-23 10:42  PCA-SIFT代码\pca-sift\pcasift-0.91nd\keypoint.h

     文件        716  2007-08-29 23:44  PCA-SIFT代码\pca-sift\pcasift-0.91nd\Makefile.am

     文件      20571  2007-08-29 23:45  PCA-SIFT代码\pca-sift\pcasift-0.91nd\Makefile.in

     文件      10270  2004-01-27 06:24  PCA-SIFT代码\pca-sift\pcasift-0.91nd\missing

     文件       1801  2004-01-27 06:24  PCA-SIFT代码\pca-sift\pcasift-0.91nd\mkinstalldirs

     文件          0  2004-01-27 06:24  PCA-SIFT代码\pca-sift\pcasift-0.91nd\NEWS

     文件        899  2004-01-27 09:30  PCA-SIFT代码\pca-sift\pcasift-0.91nd\README

     文件        795  2004-01-27 06:24  PCA-SIFT代码\pca-sift\pcasift-0.91nd\recalckeys.cc

     文件        559  2004-04-23 10:36  PCA-SIFT代码\pca-sift\training-matlab\training\pca.m

     文件        627  2004-04-23 10:36  PCA-SIFT代码\pca-sift\training-matlab\training\pcag.m

     文件        365  2004-04-23 10:36  PCA-SIFT代码\pca-sift\training-matlab\training\ploteigs.m

     文件        571  2004-04-23 10:36  PCA-SIFT代码\pca-sift\training-matlab\training\ploteigs2.m

............此处省略13个文件信息