?? ezw.c
字號:
/*----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------*/
/* EZW2 - Embedded Zerotree Wavelet Coder
*
* Author : Mow-Song, Ng
* Data : 20-07-2002
*
* Last update : 31-08-2002
*
* A large portion/idea of the codes come from:
* C. Valens - Embedded Zerotree Wavelet Encoder Tutorial.
* G. Davis - Baseline Wavelet Transform Coder Construction Kit
*
* The authors copyrights to the codes are acknowledged.
* The EZW coder is patented by Jerome Shapiro. As far as I know, these are
* the patent numbers
* 5315670 (Issued May 24, 1994), 5321776 (Issued June 14, 1994) and
* 5412741 (Issued May 2, 1995).
*
*
* Well, I wrote the coder with some one else codes, add some lines, remove
* some lines, sometimes just verbatim. Any way, if you feel that I am worth
* the acknowledgement, please do so, or perhaps drop me an e-mail.
*
* Please refer to my website for more info.
*
* My contact:
* msng@mmu.edu.my
* http://www.pesona.mmu.edu.my/~msng
*
*/
/*----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------*/
#include "ezw.h"
/*----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------*/
void EZW2Encode(WTRANSFORM *transform, ArithEncoder *encoder,
int threshold, int HistoCount, int ByteBudget,
int ScanOrder);
void EZW2BuildZerotreeMap(WTRANSFORM *transform, SubbandSymbol *ztmap);
void EncodeDominantPassMortonScan(DLNode *DomList, SLNode *SubList,
int *SubListSize, WTRANSFORM *transform,
MAP *map, int threshold,
ArithEncoder *encoder,
BasicCoder **DominantPassCoder,
SubbandSymbol *ztmap, int ByteBudget);
void EncodeNode(SLNode *SubList, int *SubListSize, WTRANSFORM *transform,
DLNode *node, SubbandSymbol *ztmap, int threshold);
void EncodeSubordinatePass(SLNode *SubList, int SubListSize, int threshold,
ArithEncoder *encoder, BasicCoder *SubordinateListCoder,
int ByteBudget);
void EZW2Error(char *fmt, ...);
void EZW2Warning(char *fmt, ...);
/* termination flag */
Boolean EndEncoding;
/*----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------*/
void main(int argc, char **argv)
{
FIMAGE *InputImage, *DecomposeImage;
WAVELET *wavelet;
WTRANSFORM *transform;
char InputImageFileName[_MAX_PATH];
char DecomposeImageFileName[_MAX_PATH];
char EncodeImageFileName[_MAX_PATH];
int NScale;
int ByteBudget;
Boolean KeepDecompose = FALSE;
Boolean EncodeFileNameSpecify = FALSE;
ArithEncoder *encoder;
BIT_FILE *EncodeStream;
float AbsMaxCoeff;
float ImageMean;
int Threshold;
int i, j;
int MaxHistogramCount;
int *bin, nbin;
int total;
double TargetBitRate;
char *ProgramName, *InputImageName;
int WaveletIndex;
FILTERSET *Filter[16];
int ScanOrder;
double t1;
EndEncoding = FALSE;
fprintf(stdout, "Embedded Zerotree Wavelet Coder - EZW2 (Encoder)\n");
InitializeFilterSets();
/* Initialize the filters used */
Filter[0] = Antonini;
Filter[1] = Adelson;
Filter[2] = Odegard;
Filter[3] = Villa1810;
Filter[4] = Brislawn;
Filter[5] = Brislawn2;
Filter[6] = Haar;
Filter[7] = Daub4;
Filter[8] = Daub6;
Filter[9] = Daub8;
Filter[10] = Villa1;
Filter[11] = Villa2;
Filter[12] = Villa3;
Filter[13] = Villa4;
Filter[14] = Villa5;
Filter[15] = Villa6;
ProgramName = argv[0];
/* default settings */
NScale = 6;
TargetBitRate = 0.25;
MaxHistogramCount = 256;
WaveletIndex = 0;
ScanOrder = 0;
if (argc<3){
fprintf(stderr, "Usage: %s [image] [bitrate]\n", ProgramName);
fprintf(stderr, "\t -l <number of levels>\n");
fprintf(stderr, "\t -w <wavelet>\n");
fprintf(stderr, "\t 0 =Antonini 1 =Adelson 2 =Odegard 3 =Villa1810\n");
fprintf(stderr, "\t 4 =Brislawn 5 =Brislawn2 6 =Haar 7 =Daub4\n");
fprintf(stderr, "\t 8 =Daub6 9 =Daub8 10=Villa1 11=Villa2\n");
fprintf(stderr, "\t 12=Villa3 13=Villa4 14=Villa5 15=Villa6\n");
fprintf(stderr, "\t -h <maximum histogram count>\n");
fprintf(stderr, "\t -e <encode filename>\n");
fprintf(stderr, "\t -k keep decompose image\n");
//fprintf(stderr, "\t -s <scan order>\n");
//fprintf(stderr, "\t 0=Morton/1=Raster\n");
return;
}
InputImageName = argv[1];
TargetBitRate = atof(argv[2]);
argv+=3; argc-=3;
while (argc > 0){
if (!strcmp("-l", *argv)){
argv++; argc--;
NScale = atoi(*argv);
argv++; argc--;
}
else if (!strcmp("-h", *argv)){
argv++; argc--;
MaxHistogramCount = atoi(*argv);
argv++; argc--;
}
else if (!strcmp("-w", *argv)){
argv++; argc--;
WaveletIndex = atoi(*argv);
if (WaveletIndex<0 || WaveletIndex > 15){
WaveletIndex = 0;
}
argv++; argc--;
}
else if (!strcmp("-e", *argv)){
argv++; argc--;
sprintf(EncodeImageFileName, "%s.ezw", *argv);
EncodeFileNameSpecify = TRUE;
argv++; argc--;
}
else if (!strcmp("-k", *argv)){
argv++; argc--;
KeepDecompose = TRUE;
}
/*
else if (!strcmp("-s", *argv)){
argv++; argc--;
ScanOrder = atoi(*argv);
if (ScanOrder<0 || ScanOrder > 1){
ScanOrder = 0;
}
argv++; argc--;
}
*/
else{
fprintf(stderr, "Invalid arguement %s\n", *argv);
fprintf(stderr, "Usage: %s [image] [bitrate]\n", ProgramName);
fprintf(stderr, "\t -l <number of levels>\n");
fprintf(stderr, "\t -w <wavelet>\n");
fprintf(stderr, "\t 0 =Antonini 1 =Adelson 2 =Odegard 3 =Villa1810\n");
fprintf(stderr, "\t 4 =Brislawn 5 =Brislawn2 6 =Haar 7 =Daub4\n");
fprintf(stderr, "\t 8 =Daub6 9 =Daub8 10=Villa1 11=Villa2\n");
fprintf(stderr, "\t 12=Villa3 13=Villa4 14=Villa5 15=Villa6\n");
fprintf(stderr, "\t -h <maximum histogram count>\n");
fprintf(stderr, "\t -e <encoded filename>\n");
fprintf(stderr, "\t -k keep decompose image\n");
//fprintf(stderr, "\t -s <scan order>\n");
//fprintf(stderr, "\t 0=Morton/1=Raster\n");
return;
}
}
/* build filenames */
sprintf(InputImageFileName, "%s.pgm", InputImageName);
sprintf(DecomposeImageFileName, "%s_%d_%s.decompose.pgm",
InputImageName, NScale, FilterName[WaveletIndex]);
if(!EncodeFileNameSpecify){
sprintf(EncodeImageFileName, "%s_%.6f_%d_%s_%d_%d.ezw", InputImageName,
TargetBitRate, NScale, FilterName[WaveletIndex],
MaxHistogramCount, ScanOrder);
}
/* read data */
if ((InputImage = ReadPGMToFloat(InputImageFileName))==NULL){
fprintf(stderr, "Fail to read input image: %s\n", InputImageFileName);
}
if ((InputImage->xsize>>NScale)<<NScale != InputImage->xsize ||
(InputImage->ysize>>NScale)<<NScale != InputImage->ysize){
EZW2Error("Image size is not consistent with number of scales.\n");
}
/* get image mean */
ImageMean = 0.0;
for (i=0; i<InputImage->xsize*InputImage->ysize; i++){
ImageMean += (float)InputImage->pixelLinear[i];
}
ImageMean /=(InputImage->xsize*InputImage->ysize);
/* subtract mean */
for (i=0; i<InputImage->xsize*InputImage->ysize; i++){
InputImage->pixelLinear[i] -=ImageMean;
}
/* initialize wavelet filter */
wavelet = WaveletAlloc(Filter[WaveletIndex]);
/* transform */
transform = WaveletTransformAlloc(wavelet, InputImage, NScale, -1);
/* decompose image */
if (KeepDecompose){
DecomposeImage = WaveletTransformCodeCoeff(transform, 1);
WriteFloatToPGM(DecomposeImage, DecomposeImageFileName);
FImageFree(DecomposeImage);
}
fprintf(stdout, "Original Image: %s\nEncoded Image : %s\n",
InputImageFileName, EncodeImageFileName);
fprintf(stdout, "Width: %d Height: %d ",
InputImage->xsize, InputImage->ysize);
fprintf(stdout, "Mean : %.3f ", ImageMean);
/* compute the byte budget */
ByteBudget = (int)(InputImage->xsize*InputImage->ysize*TargetBitRate / 8.0);
fprintf(stdout, "Bytes: %d (%.5fbpp)\n", ByteBudget, TargetBitRate);
/* get largest magnitude coefficient */
AbsMaxCoeff = -1.0;
for (i=0; i<transform->vsize*transform->hsize; i++){
if (fabs(transform->value[i]) > AbsMaxCoeff){
AbsMaxCoeff = (float)fabs(transform->value[i]);
}
}
fprintf(stdout, "Abs Max Coeff : %f\n", AbsMaxCoeff);
/* get threshold */
Threshold = 1 << (int)(floor(log10(AbsMaxCoeff)/log10(2)));
fprintf(stdout, "Initial threshold: %d Levels: %d Wavelet: %s Scan: %d\n\n",
Threshold, NScale, FilterName[WaveletIndex], ScanOrder);
/* - debug
printf("Analysing data.\n");
nbin=log2(Threshold)+2;
bin = (int*)malloc(sizeof(int)*nbin);
for (i=0; i<nbin; i++){
bin[i]=0;
}
for (i=0; i<transform->vsize*transform->hsize; i++){
for (j=0; j<nbin; j++){
if (fabs(transform->value[i]) < (1<<j)){
bin[j]++;
break;
}
}
}
printf("Thres Number of Coeffs\n");
total = 0;
for (i=0; i<nbin; i++){
printf("%5d %8d\n", 1<<i, bin[i]);
total += bin[i];
}
printf("Total number of coefficients: %d\n", total);
*/
/* initialize encode stream */
EncodeStream = OpenOutputBitFile(EncodeImageFileName);
encoder = ArithEncoderAlloc(EncodeStream);
ArithEncoderStart(encoder);
/* write header */
BasicCoderWriteNBits(encoder, InputImage->xsize, ImageXSizeBits);
BasicCoderWriteNBits(encoder, InputImage->ysize, ImageYSizeBits);
BasicCoderWriteNBits(encoder, ScanOrder, ScanOrderBits);
BasicCoderWriteNBits(encoder, NScale, ScaleBits);
BasicCoderWriteNBits(encoder, WaveletIndex, WaveletIndexBits);
BasicCoderWriteNBits(encoder, *((unsigned int *)&ImageMean), ImageMeanBits);
BasicCoderWriteNBits(encoder, log2(Threshold), ThresholdBits);
BasicCoderWriteNBits(encoder, MaxHistogramCount, MaxHistoCountBits);
/* EZW coding */
EZW2Encode(transform, encoder, Threshold, MaxHistogramCount,
ByteBudget, ScanOrder);
/* Clean up */
ArithEncoderDone(encoder);
ArithEncoderDealloc(encoder);
CloseOutputBitFile(EncodeStream);
FImageFree(InputImage);
WaveletTransformDealloc(transform);
WaveletDealloc(wavelet);
RemoveFilterSets();
fprintf(stderr, "Done\n");
PrintLeaks();
return;
}
/*----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------*/
void EZW2Encode(WTRANSFORM *transform, ArithEncoder *encoder,
int threshold, int HistoCount, int ByteBudget, int ScanOrder)
{
//定義4個主編碼掃描和一個從屬編碼掃描
BasicCoder *DominantPassCoder[4];
BasicCoder *SubordinateListCoder;
int i, nPass=0;
int BitsCount, TempCount;
MAP *map;
SubbandSymbol *ztmap;
DLNode *DomList, *DomListTemp1, *DomListTemp2;
SLNode *SubList;
int SubListSize;
//建立圖像小波系數的零樹圖
if ((ztmap=SubbandSymbolAlloc(transform->hsize,
transform->vsize, transform->nsteps)) == NULL)
{
EZW2Error("Fail to allocate subband symbol.\n");
}
EZW2BuildZerotreeMap(transform, ztmap);
//建立主編碼掃描的小波系數表
if ((DomList = (DLNode *)malloc(sizeof(DLNode)
*transform->vsize*transform->hsize))==NULL)
{
EZW2Error("Fail to allocate dominant list.\n");
}
//建立從屬編碼掃描的小波系數表
if ((SubList = (SLNode *)malloc(sizeof(SLNode)
*transform->vsize*transform->hsize))==NULL)
{
EZW2Error("Fail to allocate subordinate list.\n");
}
//在主編碼掃描未完成的時候，從屬過程的系數表為空
SubListSize = 0;
//主編碼掃描過程建立4張系數表
for (i=0; i<4; i++)
{
if ((DominantPassCoder[i] = BasicCoderAlloc(4, HistoCount)) == NULL)
{
EZW2Error("Fail to allocate dominanat pass coder.\n");
}
}
//建立一個從屬過程的小波系數上下文表
if ((SubordinateListCoder = BasicCoderAlloc(2, HistoCount)) == NULL){
EZW2Error("Fail to allocate subordinate list coder.\n");
}
//記錄編碼為POS和NEG的小波系數信息
transform->nsteps))==NULL){
EZW2Error("Fail to allocate map.\n");
}
//統計目前為止編碼器的輸出數據流量
BitsCount = ArithEncoderNBitsOutput(encoder);
while((threshold!=0) && (EndEncoding!=TRUE))
{
printf("Pass #%2d - ", ++nPass);
if (ScanOrder==0){
//主編碼掃描過程
EncodeDominantPassMortonScan(DomList, SubList, &SubListSize,
transform, map, threshold, encoder,
DominantPassCoder, ztmap, ByteBudget);
}
else{
//否則，空操作
}
//統計當前編碼輸出流量
TempCount = ArithEncoderNBitsOutput(encoder);
//從屬編碼過程
EncodeSubordinatePass(SubList, SubListSize, threshold>>1, encoder,
SubordinateListCoder, ByteBudget);
//統計輸出流量
BitsCount = ArithEncoderNBitsOutput(encoder);
printf("Sign Coeff: %6d (%5d) Bytes: %-6d (SB:%d)\n",
SubListSize, threshold, ROUND((BitsCount/8.0)), BitsCount-TempCount);
//完成編碼后，將編碼器復位
if (EndEncoding != TRUE){
threshold >>= 1;
for (i=0; i<4; i++){
BasicCoderReset(DominantPassCoder[i]);
}
BasicCoderReset(SubordinateListCoder);
}
}
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