?? intdwt97.cpp
字號:
// LiftDwt.cpp: implementation of the CLiftDwt class.
//
//
// 使用帶參數(shù)的9-7小波濾波器進行的整數(shù)小波變換，采用了參數(shù)9-7小波濾波器的提升格式，但是當參數(shù)為0.5時候，提升格式不同，因此，此程序中參數(shù)選擇范圍不能包括0.5
//
//
//
//
//
//
//////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "IntDwt97.h"
#include "math.h"
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
CIntDwt97::CIntDwt97()
{
p_t = 0.75;
shift = 4;
filterset(p_t); // 設置濾波器的系數(shù)
}
CIntDwt97::~CIntDwt97()
{
delete []h;
delete []h1;
}
void CIntDwt97::Dwt2D(int *buffer, int height, int width, int lv)
{
int i,j,k;
int nheight,nwidth;
int *pbuffer1,*pbuffer2;
for ( k=0; k<lv; k++)
{
nheight=height>>k;
nwidth=width>>k;
pbuffer1 = new int [nheight];
pbuffer2 = new int [nwidth];
//行變換
for (i=0; i<nheight; i++)
{
for(j=0; j<nwidth; j++)
*(pbuffer1+j) = *(buffer+i*width+j);
Dwt1D(pbuffer1,nwidth);
for(j=0; j<nwidth; j++)
*(buffer+i*width+j) = *(pbuffer1+j);
}
delete []pbuffer1;
//列變換
for(j=0; j<nwidth; j++)
{
for (i=0; i<nheight; i++)
*(pbuffer2+i)= *(buffer+i*width+j);
Dwt1D(pbuffer2,nheight);
for(i=0; i<nwidth; i++)
*(buffer+i*width+j) = *(pbuffer2+i);
}
delete []pbuffer2;
}
}
void CIntDwt97::IDwt2D(int *buffer, int height, int width, int lv)
{
int i,j,k;
int nheight,nwidth;
int *pbuffer1,*pbuffer2;
for (k=0; k<lv; k++)
{
nheight=height>>(lv-k-1);
nwidth=width>>(lv-k-1);
pbuffer1 = new int [nheight];
pbuffer2 = new int [nwidth];
//列反變換
for(j=0; j<nwidth; j++)
{
for (i=0; i<nheight; i++)
*(pbuffer1+i) = *(buffer+i*width+j);
IDwt1D(pbuffer1,nheight);
for(i=0; i<nheight; i++)
*(buffer+i*width+j) = *(pbuffer1+i);
}
delete []pbuffer1;
//行反變換
for (i=0; i<nheight; i++)
{
for(j=0; j<nwidth; j++)
*(pbuffer2+j)=*(buffer+i*width+j);
IDwt1D(pbuffer2,nwidth);
for(j=0; j<nwidth; j++)
*(buffer+i*width+j) = *(pbuffer2+j);
}
delete []pbuffer2;
}
}
void CIntDwt97::Dwt1D(int *buffer, int buflen)
{
int i;
int itemp;
int *d, *s, *p;
p = new int [buflen+2*shift];
d = new int [(buflen>>1)+shift];
s = new int [(buflen>>1)+shift];
/* 使用周期延拓方式 /*
for (i=0; i<shift; i++){
*(p+i) = *(buffer+buflen-shift+i);
*(p+buflen+shift+i) = *(buffer+i);
}
for (i=0; i<buflen; i++) *(p+i+shift) = *(buffer+i);
/* 數(shù)據(jù)延拓結束 計算p1 = d1 p2 = s1 */
/* 對稱延拓 */
for (i=0; i<shift; i++)
{
*(p+i) = *(buffer+shift-i);
*(p+buflen+shift+i) = *(buffer+buflen-i-2);
}
for (i=0; i<buflen; i++)
*(p+i+shift) = *(buffer+i);
/* 數(shù)據(jù)延拓結束 計算p1 = d1 p2 = s1 */
for (i=0; i<(buflen>>1)+shift; i++)
{
itemp = i-(shift>>1);
*(d+i) = *(p+shift+2*itemp+1) + int(floor(p_alfa*( *(p+shift+2*itemp)+*(p+shift+2*itemp+2))+0.5));
}
for (i=0; i<(buflen>>1)+shift-1; i++)
{
itemp = i+1-(shift>>1);
*(s+i+1) = *(p+shift+2*itemp) + int(floor( p_beta*( *(d+i+1)+*(d+i+1-1) )+0.5));
}
/* d1 s1 計算結束 下計算 d2 */
for (i=0; i<(buflen>>1)+shift-1; i++)
{
//itemp = i-(shift>>1);
*(p+shift+(buflen>>1)+i) = *(d+i) + int(floor(p_gama*( *(s+i)+*(s+i+1))+0.5));
}
/* s2 */
for (i=0; i<(buflen>>1)+shift-1; i++)
{
// itemp = i-(shift>>1);
*(p+i+1) = *(s+i+1) + int(floor(p_delta*(*(p+(buflen>>1)+shift+i+1) + *(p+(buflen>>1)+shift+i+1-1) )+0.5));
}
/* d3 */
for (i=0; i<(buflen>>1); i++)
*(d+i) = *(p+i+(buflen>>1)+shift+(shift>>1)) + int(floor(p_kesa*(1-p_kesa)*(*(p+i+(shift>>1)))+0.5));
/* s3 */
for (i=0; i<(buflen>>1); i++)
*(s+i) = *(p+i+(shift>>1)) -int(floor(1/p_kesa*(*(d+i))+0.5));
/* d4 */
for (i=0; i<(buflen>>1); i++)
*(buffer+i+(buflen>>1)) = *(d+i) +int(floor((p_kesa-1)*(*(s+i))+0.5));
/* s4 */
for (i=0; i<(buflen>>1); i++)
*(buffer+i) = *(s+i) + *(buffer+i+(buflen>>1));
/* for (i=0; i<(buflen>>1); i++){
*(buffer+i) = p_kesa*(*(p+i+(shift>>1)));
*(buffer+i+(buflen>>1)) = 1/p_kesa*(*(p+i+(buflen>>1)+shift+(shift>>1)));
}
*/
delete []p;
delete []d;
delete []s;
}
void CIntDwt97::IDwt1D(int *buffer, int buflen)
{
int i;
int *p1, *p2, *s, *d;
p1 = new int [(buflen>>1)+shift];
p2 = new int [(buflen>>1)+shift];
s = new int [(buflen>>1)+shift];
d = new int [(buflen>>1)+shift];
/* s3 */
for (i=0; i<(buflen>>1); i++)
*(s+i) = *(buffer+i) - *(buffer+i+(buflen>>1));
/* d3 */
for (i=0; i<(buflen>>1); i++)
*(d+i) =*(buffer+i+(buflen>>1))- int(floor((p_kesa-1)*(*(s+i))+0.5));
/* s2 */
for (i=0; i<(buflen>>1); i++)
*(buffer+i) = *(s+i) + int(floor((1/p_kesa)*(*(d+i))+0.5));
/* d2 */
for (i=0; i<(buflen>>1); i++)
*(buffer+i+(buflen>>1)) = *(d+i) - int(floor(p_kesa*(1-p_kesa)*(*(buffer+i))+0.5));
/* 延拓方式為周期延拓 /*
for (i=0; i<(shift>>1); i++){
p1[i] = buffer[i+(buflen>>1)-(shift>>1)];
p1[i+(shift>>1)+(buflen>>1)] = buffer[i];
p2[i] = buffer[i+buflen-(shift>>1)];
p2[i+(shift>>1)+(buflen>>1)] = buffer[i+(buflen>>1)];
}
for (i=0; i<(buflen>>1); i++){
p1[i+(shift>>1)] = buffer[i];
p2[i+(shift>>1)] = buffer[i+(buflen>>1)];
}
/* 延拓結束 */
/* 對稱延拓 */
for (i=0; i<(shift>>1); i++)
{
p1[i] = buffer[(shift>>1)-i];
p1[i+(shift>>1)+(buflen>>1)] = buffer[(buflen>>1)-i-1];
p2[i] = buffer[(buflen>>1)+(shift>>1)-i-1];
p2[i+(shift>>1)+(buflen>>1)] = buffer[buflen-i-2];
}
for (i=0; i<(buflen>>1); i++)
{
p1[i+(shift>>1)] = buffer[i];
p2[i+(shift>>1)] = buffer[i+(buflen>>1)];
}
/* 對稱延拓結束 */
/* s1 */
for (i=0; i<(buflen>>1)+shift-1; i++)
*(s+i+1) = *(p1+i+1) - int(floor(p_delta*( *(p2+i+1) + *(p2+i+1-1))+0.5));
/* d1 */
for (i=0; i<(buflen>>1)+shift-1; i++)
*(d+i) = *(p2+i) - int(floor(p_gama*(*(s+i) + *(s+i+1))+0.5));
/* p1 = s0 */
for (i=0; i<(buflen>>1)+shift-1; i++)
*(p1+i+1) = *(s+i+1) - int(floor(p_beta*( *(d+i+1)+*(d+i+1-1))+0.5));
/* p2 = d0 */
for (i=0; i<(buflen>>1)+shift-1; i++)
*(p2+i) = *(d+i) - int(floor(p_alfa*(*(p1+i) + *(p1+i+1))+0.5));
for (i=0; i<(buflen>>1); i++){
*(buffer+2*i) = *(p1+i+(shift>>1)) ;
*(buffer+2*i+1) = *(p2+i+(shift>>1));
}
delete []p1;
delete []p2;
delete []s;
delete []d;
}
void CIntDwt97::filterset(double t)
{
h = new double [9];
h1 = new double [7];
*h = (8*t*t*t-6*t*t+3*t)/(1+2*t)*(1/32.)*sqrt(2);
*(h+1) = (-16*t*t*t+20*t*t-12*t+3)/(1+2*t)*(1/32.)*sqrt(2);
*(h+2) = (2*t-3)/(1+2*t)*(1/8.)*sqrt(2);
*(h+3) = (16*t*t*t-20*t*t+28*t+5)/(1+2*t)*(1/32.)*sqrt(2);
*(h+4) = (-8*t*t*t+6*t*t+5*t+20)/(1+2*t)*(1/16.)*sqrt(2);
*(h+5) = *(h+3);
*(h+6) = *(h+2);
*(h+7) = *(h+1);
*(h+8) = *(h+0);
double r0, r1, s0, t0;
r0 = (*(h+4))-2*(*h)*(*(h+3))/(*(h+1));
r1 = (*(h+2))-(*h)-(*h)*(*(h+3))/(*(h+1));
s0 = (*(h+3))-(*(h+1))-(*(h+1))*r0/r1;
t0 = r0-2*r1;
p_alfa = (*h)/(*(h+1));
p_beta = (*(h+1))/r1;
p_gama = r1/s0;
p_delta = s0/t0;
p_kesa = t0;
}
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