wvtpezw_tree_codec.hpp

《Visual C++小波变换技术与工程实践》靳济芳编著的光盘程序。

/****************************************************************************/
/*   MPEG4 Visual Texture Coding (VTC) Mode Software                        */
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/*   This software was jointly developed by the following participants:     */
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/*   Single-quant,  multi-quant and flow control                            */
/*   are provided by  Sarnoff Corporation                                   */
/*     Iraj Sodagar   ([e-mail])                                    */
/*     Hung-Ju Lee    ([e-mail])                                   */
/*     Paul Hatrack   ([e-mail])                                 */
/*     Shipeng Li     ([e-mail])                                 */
/*     Bing-Bing Chai ([e-mail])                                   */
/*     B.S. Srinivas  ([e-mail])                               */
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/*   Bi-level is provided by Texas Instruments                              */
/*     Jie Liang      ([e-mail])                                        */
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/*     Zhixiong Wu    ([e-mail])                                 */
/*     Yoshihiro Ueda ([e-mail])                               */
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/* In the course of development of the MPEG-4 standard, this software       */
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/****************************************************************************/

/****************************************************************************/
/*     Texas Instruments Predictive Embedded Zerotree (PEZW) Image Codec    */
/*	   Developed by Jie Liang ([e-mail])                                */
/*													                        */ 
/*     Copyright 1996, 1997, 1998 Texas Instruments	      		            */
/****************************************************************************/

/****************************************************************************
   File name:         wvtpezw_tree_codec.h
   Author:            Jie Liang  ([e-mail])
   Functions:         Header file for definition of global variables used 
                      inside the PEZW module code.
   Revisions:         v1.0 (10/04/98)
*****************************************************************************/

#include <stdio.h>
#include <wvtPEZW.hpp>

#include "PEZW_ac.hpp"

#define MAX_BITPLANE   16
#define MIN_BITPLANE   0

/* the wavelet tree buffer */
extern WINT *the_wvt_tree;

/* data structure for storing the maximum value of the
   wavelet coefficients */
extern WINT *wvt_tree_maxval; 
extern WINT MaxValue; 

/* weighting for different band */
extern int *snr_weight;

/* length of the tree structure */
extern int len_tree_struct;

/* the absolute value of the wavelet coefficients */
extern WINT *abs_wvt_tree;

/* location map for converting wavelets from blocks
   to trees */
extern int *vloc_map, *hloc_map;

/* data structure for information for zerotree coefficients
   that need to be coded */
extern short *ScanTrees;
extern short *next_ScanTrees;

/* the depth of the tree, or decomposition level */  
extern int tree_depth;

/* position and layer of all significant coefficients */
extern short *sig_pos;
extern char *sig_layer;

/* number of significant coefficients */
extern int num_Sig;

/* addition block of memory to allocate if the initial
   buffer is not enough */
#define Initial_Bufsize  100

/* arithmetic encoder data structure for each decomposition
   depth and bitplane */
extern Ac_encoder **Encoder;
extern Ac_decoder **Decoder;
extern unsigned char ***buffer_ptr;
extern unsigned char bptemp;

/* position of the starting point for each depth */
extern short *level_pos;

/* status of previous zerotree */
extern unsigned char *prev_label;

/* sign bit for decoder */
extern char *sign_bit;

/* models */
extern Ac_model *context_model;
extern Ac_model *model_sign;
extern Ac_model *model_sub;

/* mask */
extern unsigned int *maskbit;
extern unsigned char *bitplane;

/* the adaptation mode of the arithmetic coder:
   1- adaptive, 0- fixed  */
#define ADAPTATION_MODE   1