www.pudn.com > EZW_.rar > FILTER.H

#ifndef __FILTER_H_ 
#define __FILTER_H_ 
 
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/* Port to C from C++ 
 * 
 * Mow-Song, Ng 2/9/2002 
 * msng@mmu.edu.my 
 * http://www.pesona.mmu.edu.my/~msng 
 * 
 * I do not claim copyright to the code, but if you use them or modify them, 
 * please drop me a mail. 
 * 
 */ 
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/* 
 * $LOG  
 * ---- 
 * - Found a bug in the symmetry of filter, it was never set!!! 
 *   If the wavelet transform is called without specifying the symmetry  
 *   (==-1), then it will rely on the symmetry of the wavelet used. 
 *   In my code, since I used biorthogonal filters most of the time, I have  
 *   specify the symmetry as TRUE. This is alright for filters like Antonini, 
 *   Adelson, Villa1810 etc. However, the problem appears in orthogonal  
 *   filters like Haar, Daub4, Daub6 and Daub8, which requires that the  
 *   symmetry set to FALSE to use periodic extension.  
 *    
 */ 
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/* Original copyright info */ 
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// Baseline Wavelet Transform Coder Construction Kit 
// 
// Geoff Davis 
// gdavis@cs.dartmouth.edu 
// http://www.cs.dartmouth.edu/~gdavis 
// 
// Copyright 1996 Geoff Davis 9/11/96 
// 
// Permission is granted to use this software for research purposes as 
// long as this notice stays attached to this software. 
// 
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#include  
#include  
#include  
 
#include "global.h" 
#include "memchk.h" 
 
typedef struct FilterStruct { 
   int size, firstIndex, center; 
   Real *coeff; 
} FILTER; 
 
typedef struct FilterSetStruct { 
   int symmetric; 
   FILTER *analysisLow; 
   FILTER *analysisHigh; 
   FILTER *synthesisLow; 
   FILTER *synthesisHigh; 
} FILTERSET; 
 
/* FILTER */ 
FILTER * FilterAllocDef(void); 
FILTER * FilterAlloc(int size, int firstIndex, Real *coeff); 
FILTER * FilterAllocCopy(FILTER *filterSrc); 
void FilterDealloc(FILTER *filter); 
void FilterInit(FILTER *filter, int size, int firstIndex, Real *coeff); 
Real FilterCoeff(FILTER *filter, int index); 
void FilterCopy(FILTER *filterDest, FILTER *filterSrc); 
 
/* FILTERSET */ 
FILTERSET * FilterSetAllocDef(void);	 
FILTERSET * FilterSetAlloc(int symmetric,  
									Real *anLow, int anLowSize, int anLowFirst, 
									Real *synLow, int synLowSize, int synLowFirst); 
 
FILTERSET * FilterSetAllocCopy(FILTERSET *filtersetSrc); 
void FilterSetDealloc(FILTERSET *filterset); 
void FilterSetCopy(FILTERSET *filtersetDest, FILTERSET *filtersetSrc); 
 
void InitializeFilterSets(void); 
void RemoveFilterSets(void); 
 
void FilterError(char *fmt, ...); 
void FilterWarning(char *fmt, ...); 
 
 
#endif