资源简介
NSCT方法是由传统的contourlet变化改进而来,contourlet变化是用轮廓段的基结构来对图像的直线奇异和曲线奇异进行逼近检测,但其融合后的图像不具有平移不变性,没有很好的消除混频现象以及吉布斯现象。而本文提出的NSCT不但保留了contourlet变化的多尺度,多方向,各向异性等优点,在图像分解时采用来非下采样形式剪切波变换能够很好的避免图像由于分解与重构带来的细节丢失,更重要的是分解后的图像与原图像大小相同,因此能够更好的完整描述图像的方向性和特征。
代码片段和文件信息
/******************************************************************
* atrousc.c - Written by Arthur Cunha. This routine builds up on
* zconv2D_OS.c written by Jason Laska
*
* Inputs: x - A 2D signal
* h - 2D filter
* m - separable upsampling matrix
*
* Outputs: y - 2D result of convolution with filter
* upsampled by a m only the ‘valid‘ part is returned.
* Similar to conv2(xh‘valid‘) where h is the upsampled
* filter.
*
*
*
* Usage: y = zconv2D_O(xhm);
*
* Notes: This function does not actually upsample the filter
* it computes the convolution as if the filter had been
* upsampled. This is the ultimate optimized version.
* Further optimized for separable (diagonal) upsampling matrices.
*
* This is a MEX-FILE for matlab
*
/********************************************************/
#include “mex.h“
#include
//Constants for matlab interfacing
#define OUT plhs[0]
#define SIGNAL prhs[0] //flip and shift
#define FILTER prhs[1] //stationary
#define MMATRIX prhs[2]
//MACRO for converting positions to linear
#define LINPOS(rowcolcollen) (row*collen)+col
void mexFunction(int nlhs mxArray *plhs[] int nrhs const mxArray *prhs[])
{
//Declarations
double *FArray*SArray*outArray*M;
/* FArray - Filter coefficients
SArray - Signal coefficients
outArray - Output coefficients
M - upsampling matrix */
int SColLengthSRowLengthFColLengthFRowLengthO_SColLengthO_SRowLength;
int SFColLengthSFRowLength;
int n1n2l1l2k1k2f1f2 kk2 kk1;
double sum;
int M0M3sM0sM3;
//Get the input sizes
SColLength = mxGetM(SIGNAL);
SRowLength = mxGetN(SIGNAL);
FColLength = mxGetM(FILTER);
FRowLength = mxGetN(FILTER);
SFColLength = FColLength-1;
SFRowLength = FRowLength-1;
//Get The Data
FArray = mxGetPr(FILTER);
SArray = mxGetPr(SIGNAL);
M = mxGetPr(MMATRIX);
M0 = (int)M[0];
M3 = (int)M[3];
sM0 = M0-1;
sM3 = M3-1;
// Corrected Lengths
O_SColLength = SColLength - M0*FColLength + 1;
O_SRowLength = SRowLength - M3*FRowLength + 1;
//Make output size and Allocate out vector
OUT = mxCreateDoubleMatrix(O_SColLength O_SRowLength mxREAL);
outArray = mxGetPr(OUT); //outArray is new vector
/* Convoluyion loop */
for (n1=0;n1 for (n2=0;n2 sum=0;
kk1 = n1 + sM0;;
for (k1=0;k1 kk2 = n2 + sM3;
for (k2=0;k2 f1 = SFRowLength - k1; /* flipped index */
f2 = SFColLength - k2;
sum+= FArray[LINPOS(f1f2FColLength)] * SArray[LINPOS(kk1kk2SColLength)];
kk2+=M3;
}
kk1+=M0;
}
outArray[LINPOS(n1n2O_SColLength)] = sum;
}
}
return;
}
属性 大小 日期 时间 名称
----------- --------- ---------- ----- ----
文件 2969 2004-10-17 16:42 nsct_toolbox\atrousc.c
文件 7168 2004-10-17 16:45 nsct_toolbox\atrousc.dll
文件 8664 2005-01-24 21:51 nsct_toolbox\atrousc.mexmac
文件 1234 2005-11-03 09:10 nsct_toolbox\atrousdec.m
文件 19406 2004-09-09 15:01 nsct_toolbox\atrousfilters.m
文件 1012 2004-10-17 16:45 nsct_toolbox\atrousrec.m
文件 3214 2005-01-21 15:59 nsct_toolbox\decdemo.m
文件 1495 2004-12-22 22:48 nsct_toolbox\dfbdecdemo.m
文件 13234 2004-10-18 12:28 nsct_toolbox\dfilters.m
文件 2607 2004-12-22 21:26 nsct_toolbox\dmaxflat.m
文件 1103 2003-04-10 11:30 nsct_toolbox\efilter2.m
文件 1861 2003-11-06 00:25 nsct_toolbox\extend2.m
文件 856 2003-04-10 11:30 nsct_toolbox\ld2quin.m
文件 662 2003-11-05 10:17 nsct_toolbox\ldfilter.m
文件 854 2003-11-05 10:19 nsct_toolbox\mctrans.m
文件 775 2003-04-10 11:30 nsct_toolbox\modulate2.m
文件 4662 2005-11-03 10:47 nsct_toolbox\nsctdec.m
文件 3257 2005-11-03 10:33 nsct_toolbox\nsctrec.m
文件 5046 2005-01-20 23:13 nsct_toolbox\nsdfbdec.m
文件 4931 2005-01-20 23:14 nsct_toolbox\nsdfbrec.m
文件 889 2005-12-19 11:12 nsct_toolbox\nsfbdec.m
文件 821 2004-10-21 07:11 nsct_toolbox\nsfbrec.m
文件 2424 2005-01-20 23:51 nsct_toolbox\nssfbdec.m
文件 2785 2005-01-20 23:50 nsct_toolbox\nssfbrec.m
文件 1552 2004-08-07 18:43 nsct_toolbox\parafilters.m
文件 1161 2003-11-07 19:58 nsct_toolbox\qupz.m
文件 1557 2005-01-20 23:45 nsct_toolbox\README.txt
文件 1981 2003-04-10 11:30 nsct_toolbox\resampz.m
文件 1001 2005-01-20 23:27 nsct_toolbox\shownsct.m
文件 888 2005-12-19 11:07 nsct_toolbox\symext.m
............此处省略13个文件信息
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