coder.h

傅立叶变换和小波变换是图像压缩的重要工具。该代大戏是利用小波变换进行图像压缩。

#ifndef CODER_H
#define CODER_H

#include "wavelet.h"
#include <crblib/rungae.h>

void codeWavelet(Wavelet *w,bool forward);

void encodeBands(SubBand *LH,SubBand *HL,SubBand *HH,arithInfo *ari);
void decodeBands(SubBand *LH,SubBand *HL,SubBand *HH,arithInfo *ari);

/*********/

#define NUM_CONTEXTS		(8)
#define NUM_UNARY_CONTEXTS	(5)
#define NUM_SIGN_CONTEXTS	(3)

typedef struct LapInfo
{
	rung_t isOn[NUM_CONTEXTS];
	rung_t unary[NUM_UNARY_CONTEXTS];
	rung_t signs[NUM_SIGN_CONTEXTS];
	bool lastRowOn;
} LapInfo;

void encodeRow(uint *inrow,SubBand *sb,arithInfo *ari,LapInfo *li);
uint * decodeRow(SubBand *sb,arithInfo *ari,LapInfo *li);

void LapInfo_Reset(LapInfo *li);

/*********/

#endif // CODER_H