contourlet_toolbox
所属分类:matlab编程
开发工具:matlab
文件大小:1011KB
下载次数:193
上传日期:2012-12-09 18:35:58
上 传 者:
CHMT
说明: 轮廓波变换matlab程序代码,其中包含基于Contourlet变换的图像去噪算法
(The contourlet transform matlab program code, which contains image denoising algorithm based on Contourlet transform)
文件列表:
contourlet_toolbox\backsamp.m (1119, 2003-09-11)
contourlet_toolbox\barbara.png (177851, 2003-11-11)
contourlet_toolbox\ChangeLog (2309, 2003-11-13)
contourlet_toolbox\computescale.m (6623, 2005-10-27)
contourlet_toolbox\Contents.m (3457, 2003-11-12)
contourlet_toolbox\COPYING (691, 2003-11-12)
contourlet_toolbox\decdemo.m (3332, 2007-11-04)
contourlet_toolbox\denoisedemo.m (2422, 2011-10-15)
contourlet_toolbox\dfbdec.m (2223, 2003-11-06)
contourlet_toolbox\dfbdec_l.m (1700, 2003-11-06)
contourlet_toolbox\dfbimage.m (1833, 2005-10-27)
contourlet_toolbox\dfbrec.m (2012, 2003-11-10)
contourlet_toolbox\dfbrec_l.m (1736, 2003-11-06)
contourlet_toolbox\dfilters.m (2729, 2003-11-07)
contourlet_toolbox\dup.m (755, 2003-04-10)
contourlet_toolbox\efilter2.m (1103, 2003-04-10)
contourlet_toolbox\extend2.m (1861, 2003-11-06)
contourlet_toolbox\fbdec.m (2098, 2003-04-10)
contourlet_toolbox\fbdec_l.m (1507, 2003-11-07)
contourlet_toolbox\fbrec.m (2360, 2003-04-10)
contourlet_toolbox\fbrec_l.m (1426, 2003-11-06)
contourlet_toolbox\ffilters.m (485, 2003-04-10)
contourlet_toolbox\ld2quin.m (856, 2003-04-10)
contourlet_toolbox\ldfilter.m (662, 2003-11-05)
contourlet_toolbox\lpdec.m (697, 2003-09-13)
contourlet_toolbox\lprec.m (902, 2003-09-13)
contourlet_toolbox\mctrans.m (854, 2003-11-05)
contourlet_toolbox\modulate2.m (775, 2003-04-10)
contourlet_toolbox\multifocus image\clock1.bmp (263222, 2007-09-19)
contourlet_toolbox\multifocus image\clock2.bmp (263222, 2007-09-19)
contourlet_toolbox\multifocus image\lab1.bmp (308278, 2007-09-19)
contourlet_toolbox\multifocus image\lab2.bmp (308278, 2007-09-19)
contourlet_toolbox\multifocus image\lenaleft1.bmp (66614, 2006-11-27)
contourlet_toolbox\multifocus image\lenaright2.bmp (66614, 2006-11-27)
contourlet_toolbox\multifocus image\pepsi1.bmp (263222, 2007-09-19)
contourlet_toolbox\multifocus image\pepsi2.bmp (263222, 2007-09-19)
contourlet_toolbox\nlademo.m (5350, 2003-11-11)
contourlet_toolbox\nlademo2.m (1186, 2003-11-12)
contourlet_toolbox\pdfb2vec.m (1254, 2003-11-13)
contourlet_toolbox\pdfbdec.asv (2671, 2007-10-16)
... ...
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 images
that 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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