contourlet
所属分类:matlab编程
开发工具:matlab
文件大小:895KB
下载次数:70
上传日期:2011-10-03 17:43:57
上 传 者:
chengzi0606
说明: contourlet方法源代码,实现对图像特征值的提取
(code of contourlet method)
文件列表:
contourlet\Lastprogram\._ChangeLog (82, 2003-11-13)
contourlet\Lastprogram\._computescale.m (82, 2005-10-27)
contourlet\Lastprogram\._Contents.m (82, 2003-11-12)
contourlet\Lastprogram\._showpdfb.m (82, 2005-10-27)
contourlet\Lastprogram\1.bmp (7969, 2011-06-16)
contourlet\Lastprogram\atrousc.c (2969, 2004-10-17)
contourlet\Lastprogram\atrousc.dll (7168, 2004-10-17)
contourlet\Lastprogram\atrousc.mexmac (8664, 2005-01-24)
contourlet\Lastprogram\atrousdec.m (1234, 2005-11-03)
contourlet\Lastprogram\atrousfilters.m (19406, 2004-09-09)
contourlet\Lastprogram\atrousrec.m (1012, 2004-10-17)
contourlet\Lastprogram\backsamp.m (1119, 2003-09-11)
contourlet\Lastprogram\barbara.png (177851, 2003-11-11)
contourlet\Lastprogram\bayes.m (267, 2010-05-11)
contourlet\Lastprogram\BayesShrink.asv (1349, 2011-03-23)
contourlet\Lastprogram\ChangeLog (2309, 2003-11-13)
contourlet\Lastprogram\CmDnoise.m (271, 2011-03-05)
contourlet\Lastprogram\CmEi.m (169, 2011-03-10)
contourlet\Lastprogram\computescale.m (6623, 2005-10-27)
contourlet\Lastprogram\Contents.m (3457, 2003-11-12)
contourlet\Lastprogram\contourlet_toolbox\resampc.dll (7168, 2003-04-10)
contourlet\Lastprogram\COPYING (691, 2003-11-12)
contourlet\Lastprogram\CTBayes.m (1517, 2011-05-06)
contourlet\Lastprogram\decdemo.m (3214, 2005-01-21)
contourlet\Lastprogram\denoisedemo.m (2420, 2003-02-04)
contourlet\Lastprogram\dfbdec.m (2223, 2003-11-06)
contourlet\Lastprogram\dfbdecdemo.m (1495, 2004-12-22)
contourlet\Lastprogram\dfbdec_l.m (1700, 2003-11-06)
contourlet\Lastprogram\dfbimage.m (1833, 2005-10-27)
contourlet\Lastprogram\dfbrec.m (2012, 2003-11-10)
contourlet\Lastprogram\dfbrec_l.m (1736, 2003-11-06)
contourlet\Lastprogram\dfilters.m (13234, 2004-10-18)
contourlet\Lastprogram\dmaxflat.m (2607, 2004-12-22)
contourlet\Lastprogram\dup.m (755, 2003-04-10)
contourlet\Lastprogram\efilter2.m (1103, 2003-04-10)
contourlet\Lastprogram\extend2.m (1861, 2003-11-06)
contourlet\Lastprogram\fbdec.m (2098, 2003-04-10)
contourlet\Lastprogram\fbdec_l.m (1507, 2003-11-07)
contourlet\Lastprogram\fbrec.m (2360, 2003-04-10)
contourlet\Lastprogram\fbrec_l.m (1426, 2003-11-06)
... ...
Contourlet Toolbox (version 2.0, November 2003)
http://www.ifp.uiuc.edu/~minhdo/software/
This toolbox contains Matlab files that implement the contourlet
transform and its utility functions.
The main functions are the following. In addition, there are several demos
(decdemo, nlademo, nlademo2, and denoisedemo) that provide examples on
how to use these functions.
For an overview description of all functions
provided in the toolbox, see file Contents.m or type help
at the Matlab command.
pdfbdec: Contourlet or pyramidal directional filter bank (PDFB)
decomposition.
For example, suppose that x is a double matrix, then
y = pdfbdec(x, '9-7', 'pkva', [0, 3, 3, 4]) will decompose x using a PDFB with '9-7' filter for the
pyramidal decomposition stage and
'pkva' filter for the
direction decomposition stage.
There will be 4 levels of
pyramidal decomposition and the numbers directional decomposition at each pyramidal level (from coarse to fine)
are: 0, 3, 3, and 4.
The output y has cell vector structure
such that:
y{1} is the lowpass subband image;
y{2}{1}, y{2}{2}, y{2}{3} are 3 highpass subband imagesthat together with y{1} is output of 2-D wavelet
filter bank; y{3}{1}, ..., y{3}{8} are 8 directional subband images at
the next finer pyramidal level;y{4}{1}, ..., y{4}{8} are 8 directional subband images at the next finer pyramidal level;
y{5}{1}, ..., y{5}{16} are 16 directional subband images at the finest pyramidal level.
For other available pyramidal and directional filter names, see functions dfilters and pfilters, respectively.
Function pdfbdec can also be used for 2-D wavelet decomposition
. For example,
y = pdfbdec(x, '9-7', '', zeros(1, 4))
will decompose x into 4-level wavelet decomposition using'9-7' filter.
pdfbrec: Pyramidal directional filter bank (PDFB) reconstruction.
This is the inverse of the last function, i.e.
xrec = pdfbrec(y, '9-7', 'pkva');
would reconstruct xrec = x.
showpdfb: Show the PDFB output.
pdfb_tr: Truncate the PDFB coefficients to the given subbands or a number of most significant coefficients.
pdfb2vec: Convert the PDFB output into a vector of coefficients.
vec2pdfb: Undo the last function.
Note: There is one mex file (resampc.c) in the Contourlet Toolbox
that might need to be recompiled.
This can be done by typing from the Matlab command window
>> mex resampc.c
References:
[1] M. N. Do and M. Vetterli, "The contourlet transform: an efficient directional multiresolution image representation."
submitted to IEEE Transactions Image Processing, 2003.
[2] M. N. Do and M. Vetterli, "Contourlets." Beyond Wavelets,
G. V. Welland ed., Academic Press, 2003.
[3] M. N. Do and M. Vetterli, "Contourlets: a directional multiresolution
image representation," IEEE International Conference on Image Processing Rochester, September 2002.
(Check http://www.ifp.uiuc.edu/~minhdo/publications/ for these and
other related papers.)
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