原理及代碼講解鏈接: https://blog.csdn.net/qq_44394952/article/details/122587306?spm=1001.2014.3001.5502.

主函數main()

int main() {int mm = 2;printf(" =========功能：將BMP格式圖片轉換為JPG格式=========\n");while(mm != 1 ){printf("\n");//輸入文件名稱char BMP_filename[64];char JPG_filename[64];printf("輸入要壓縮的BMP格式的圖片名稱：");scanf("%s", BMP_filename);printf("輸入壓縮完成后JPG格式的圖片名稱：");scanf("%s", JPG_filename);bmp(BMP_filename);//讀入bmp信息init_JPG_and_writ(JPG_filename);//初始化JPG格式并寫入code_all(); //綜合變換并寫入printf("\n");printf("輸入'1'退出，輸入任意數字繼續：");scanf("%d", &mm);}return 0; }

讀入BMP，逆序轉換，填充

void bmp(char *bmp_name) {unsigned short int x8, y8; //拓展長度signed short int y2 , a = 0; //用于處理倒序unsigned char fillbytes; //可被4整除colorRGB lastcolor;unsigned short int column, nrline, line_up, line_down;unsigned char TOPBUF[256]; //存取頭部信息colorRGB *tmpline; //用于交換FILE *fp_bmp = fopen(bmp_name, "rb");//打開文件if(fp_bmp == NULL){printf("文件打開失敗！");exit(0);}//讀取文件頭部信息fread(TOPBUF, 1, 54, fp_bmp);if((TOPBUF[0]!='B')||(TOPBUF[1]!='M')){printf("文件不是BMP格式！");exit(0);}//圖片長和寬ximage = (unsigned short int)TOPBUF[19]*256 + TOPBUF[18];//圖片長度和寬度y2 = (short int)TOPBUF[23]*256 + TOPBUF[22];yimage = y2;//長度負值處理if(y2 <= 0){a = 1;yimage = -y2;}SOF0info.width = ximage;SOF0info.height = yimage;if(ximage%8!=0)x8 = (ximage/8)*8+8;elsex8 = ximage;if(yimage%8!=0)y8 = (yimage/8)*8+8;elsey8 = yimage;//建立并存儲,填充每一行，轉換為RGBRGB_buf = (colorRGB *)(malloc(3*x8*y8));if(RGB_buf == NULL){printf("存儲創建失敗！");exit(0);}//處理32位if(TOPBUF[28] == 32){RGBa_buf = (colorRGBa *)(malloc(4*x8*y8));if(RGBa_buf == NULL){printf("存儲創建失敗！");exit(0);}for(nrline = 0; nrline < yimage; nrline++){fread(RGBa_buf+nrline*x8,1,ximage*4,fp_bmp);memcpy(&lastcolor,RGBa_buf+nrline*x8+ximage-1,4);for(column=ximage;column<x8;column++)memcpy(RGBa_buf+nrline*x8+column, &lastcolor, 4);}for(unsigned long int n = 0; n < x8*yimage; ++n){//轉換為RGBRGB_buf[n].B = RGBa_buf[n].B;RGB_buf[n].G = RGBa_buf[n].G;RGB_buf[n].R = RGBa_buf[n].R;}}//處理24位else if(TOPBUF[28] == 24){//判斷有無填充if(ximage%4!=0)fillbytes = 4 - (ximage%4);elsefillbytes = 0;for(nrline = 0; nrline < yimage; nrline++){fread(RGB_buf+nrline*x8, 1, ximage*3, fp_bmp);fread(TOPBUF, 1, fillbytes, fp_bmp);memcpy(&lastcolor, RGB_buf+nrline*x8+ximage-1, 3);for(column = ximage; column<x8; column++)memcpy(RGB_buf+nrline*x8+column, &lastcolor, 3);}}else{printf("信息錯誤！");exit(0);}ximage = x8;tmpline = (colorRGB *)malloc(ximage*8);if(tmpline == NULL){printf("存儲創建失敗！");exit(0);}//是否需要逆序處理if(a == 0){for(line_up = yimage-1, line_down = 0;line_up>line_down; line_up--,line_down++){memcpy(tmpline, RGB_buf+line_up*ximage, ximage*3);memcpy(RGB_buf+line_up*ximage, RGB_buf+line_down*ximage, ximage*3);memcpy(RGB_buf+line_down*ximage, tmpline, ximage*3);}}//填充行memcpy(tmpline, RGB_buf+(yimage-1)*ximage, ximage*3);for(nrline = yimage; nrline < y8; nrline++)memcpy(RGB_buf+nrline*ximage, tmpline, ximage*3);yimage = y8;free(tmpline);fclose(fp_bmp);}

初始化JPG以及寫入

void init_JPG_and_writ(char *JPG_filename) {fp_jpg = fopen(JPG_filename, "wb");//打開jpg文件int i;//初始化量化表DQTinfo.marker=0xFFDB;DQTinfo.length=132;DQTinfo.QTYinfo=0;DQTinfo.QTCbinfo=1;for(i = 0; i<64; ++i){DQTinfo.Ytable[i] = DQT_Y[i];DQTinfo.Cbtable[i] = DQT_C[i];}//初始化huffman表DHTinfo.marker = 0xFFC4;DHTinfo.length = 0x01A2;DHTinfo.HTYDCinfo=0; //0號直流表for (i=0;i<16;i++)DHTinfo.YDC_codes[i]=dc_y_codes[i+1];for (i=0;i<=11;i++)DHTinfo.YDC_values[i]=dc_y_values[i];DHTinfo.HTYACinfo=0x10; //0號交流表for (i=0;i<16;i++)DHTinfo.YAC_codes[i]=ac_y_codes[i+1];for (i=0;i<=161;i++)DHTinfo.YAC_values[i]=ac_y_values[i];DHTinfo.HTCbDCinfo=1; //1號直流表for (i=0;i<16;i++)DHTinfo.CbDC_codes[i]=dc_cb_codes[i+1];for (i=0;i<=11;i++)DHTinfo.CbDC_values[i]=dc_cb_values[i];DHTinfo.HTCbACinfo=0x11; //1號交流表for (i=0;i<16;i++)DHTinfo.CbAC_codes[i]=ac_cb_codes[i+1];for (i=0;i<=161;i++)DHTinfo.CbAC_values[i]=ac_cb_values[i];writetop(); //寫入文件頭 }

寫入文件頭

void writetop() {unsigned char i;//1.SOIwriteword(0xFFD8)//2.APP0writeword(APP0info.marker);writeword(APP0info.length);writebyte('J');writebyte('F');writebyte('I');writebyte('F');writebyte(0);writebyte(APP0info.versionhi);writebyte(APP0info.versionlo);writebyte(APP0info.xyunits);writeword(APP0info.xdensity);writeword(APP0info.ydensity);writebyte(APP0info.thumbnwidth);writebyte(APP0info.thumbnheight);//3.DQTwriteword(DQTinfo.marker);writeword(DQTinfo.length);writebyte(DQTinfo.QTYinfo);for (i=0;i<64;i++)writebyte(DQTinfo.Ytable[i]);writebyte(DQTinfo.QTCbinfo);for (i=0;i<64;i++)writebyte(DQTinfo.Cbtable[i]);//4.SOF0writeword(SOF0info.marker);writeword(SOF0info.length);writebyte(SOF0info.precision);writeword(SOF0info.height);writeword(SOF0info.width);writebyte(SOF0info.nrofcomponents);writebyte(SOF0info.IdY);writebyte(SOF0info.HVY);writebyte(SOF0info.QTY);writebyte(SOF0info.IdCb);writebyte(SOF0info.HVCb);writebyte(SOF0info.QTCb);writebyte(SOF0info.IdCr);writebyte(SOF0info.HVCr);writebyte(SOF0info.QTCr);//5.DHTwriteword(DHTinfo.marker);writeword(DHTinfo.length);writebyte(DHTinfo.HTYDCinfo);for (i=0;i<16;i++)writebyte(DHTinfo.YDC_codes[i]);for (i=0;i<=11;i++)writebyte(DHTinfo.YDC_values[i]);writebyte(DHTinfo.HTYACinfo);for (i=0;i<16;i++)writebyte(DHTinfo.YAC_codes[i]);for (i=0;i<=161;i++)writebyte(DHTinfo.YAC_values[i]);writebyte(DHTinfo.HTCbDCinfo);for (i=0;i<16;i++)writebyte(DHTinfo.CbDC_codes[i]);for (i=0;i<=11;i++)writebyte(DHTinfo.CbDC_values[i]);writebyte(DHTinfo.HTCbACinfo);for (i=0;i<16;i++)writebyte(DHTinfo.CbAC_codes[i]);for (i=0;i<=161;i++)writebyte(DHTinfo.CbAC_values[i]);//6.SOSwriteword(SOSinfo.marker);writeword(SOSinfo.length);writebyte(SOSinfo.nrofcomponents);writebyte(SOSinfo.IdY);writebyte(SOSinfo.HTY);writebyte(SOSinfo.IdCb);writebyte(SOSinfo.HTCb);writebyte(SOSinfo.IdCr);writebyte(SOSinfo.HTCr);writebyte(SOSinfo.Ss);writebyte(SOSinfo.Se);writebyte(SOSinfo.Bf); }

綜合變換并寫入

void code_all() {//huffman編碼表bitstring YDC[12];bitstring CbDC[12];bitstring YAC[256];bitstring CbAC[256];//計算各項的huffman表huffman_code(dc_y_codes, dc_y_values, YDC);huffman_code(dc_cb_codes, dc_cb_values, CbDC);huffman_code(ac_y_codes, ac_y_values, YAC);huffman_code(ac_cb_codes, ac_cb_values, CbAC);//二進制長度以及編碼leng_and_numbercode();bitstring fillbit;signed short int DCY = 0, DCCb = 0, DCCr = 0;//直流系數unsigned short int x,y;//8*8一組進行處理for(y = 0; y< yimage; y+=8)for(x = 0; x<ximage; x+=8){//printf("1"); //測試RGBtoYCbCr(x,y);//RGB->YCbCrfdct_and_quan(YDU,DQTinfo.Ytable);//離散余弦和量化,z型編碼code_and_write(&DCY,YDC,YAC);//編碼并寫入fdct_and_quan(CbDU,DQTinfo.Cbtable);code_and_write(&DCCb,CbDC,CbAC);fdct_and_quan(CrDU,DQTinfo.Cbtable);code_and_write(&DCCr,CbDC,CbAC);//printf("2");}//尾部填充0并寫入尾部if(bytepos > 0){fillbit.length = bytepos;fillbit.value = 0;writefile(fillbit);}writeword(0xffd9);//EOI//釋放空間free(RGB_buf);free(RGBa_buf);fclose(fp_jpg);}

計算各個表的huffman編碼

void huffman_code(unsigned char *codes, unsigned char *values, bitstring *HT) {unsigned char k, j;unsigned char pos = 0;unsigned short int codevalue = 0;for(k = 1; k<=16; ++k){for(j = 1;j<=codes[k]; ++j){HT[values[pos]].value = codevalue; //編碼值HT[values[pos]].length = k; //長度pos ++;codevalue++;}codevalue *= 2;} }

二進制長度以及編碼

void leng_and_numbercode() {signed long int n;signed long int one = 1, two = 2;unsigned char leng;//開辟空間code_u = (bitstring *)malloc(65535*sizeof(bitstring));if(code_u == NULL){printf("存儲空間開辟失敗");exit(0);}code_d = code_u + 32767;for(leng = 1; leng <= 15; ++leng){for(n = one; n<two; ++n){code_d[n].length = leng;code_d[n].value = (unsigned short int)n;}for(n = -(two - 1); n<=-one; ++n){code_d[n].length = leng;code_d[n].value = (unsigned short int)(two-1+n);}two<<=1;one<<=1;} }

RGB->YCbCr

void RGBtoYCbCr(unsigned short int x1, unsigned short int y1) {unsigned char x,y;unsigned char pos=0;unsigned long location;unsigned char R,G,B;location=y1*ximage+x1;for (y=0;y<8;y++){for (x=0;x<8;x++){R=RGB_buf[location].R;G=RGB_buf[location].G;B=RGB_buf[location].B;YDU[pos]=(signed char)(((signed long int)(65536*0.299+0.5)*R+(signed long int)(65536*0.587+0.5)*G+(signed long int)(65536*0.114+0.5)*B)>>16)-128;CbDU[pos]=(signed char)(((signed long int)(65536*-0.16874+0.5)*R+(signed long int)(65536*-0.33726+0.5)*G+(signed long int)(65536*0.5+0.5)*B)>>16);CrDU[pos]=(signed char)(((signed long int)(65536*0.5+0.5)*R+(signed long int)(65536*-0.41869+0.5)*G+(signed long int)(65536*-0.08131+0.5)*B)>>16);location++;pos++;}location+=ximage-8;} }

離散余弦變換和量化，z型編碼

void fdct_and_quan(signed char *data, unsigned char *table) {float temp;signed short int D1[64];signed char mdata[8][8];unsigned char i,j;//離散余弦變換for(i = 0; i<8; ++i)for(j = 0;j<8; ++j)mdata[i][j] = data[8*i+j];DCT(mdata, table, D1);//z型編碼for (i = 0; i <= 63; i++)D2[z[i]] = D1[i]; }

離散余弦變化具體實現以及量化

void DCT(signed char data[8][8], unsigned char *fdtbl, signed short int *outdata) {float output[8][8], temp;double ALPHA, BETA;short u = 0;short v = 0;short i = 0;short j = 0;for(u = 0; u < 8; u++){for(v = 0; v < 8; v++){if(u == 0)ALPHA = sqrt(1.0 / 8);elseALPHA = sqrt(2.0 / 8);if(v == 0)BETA = sqrt(1.0 / 8);elseBETA = sqrt(2.0 / 8);float tmp = 0.0;for(i = 0; i < 8; i++){for(j = 0; j < 8; j++){tmp += data[i][j] * cos((2*i+1)*u*PI/(2.0 * 8)) * cos((2*j+1)*v*PI/(2.0 * 8));}}output[u][v] = ALPHA * BETA * tmp;}}// 量化for (i = 0; i < 8; i++)for(j = 0; j < 8; j++){temp = output[i][j] / (float)((double)fdtbl[z[i*8+j]]);outdata[i*8+j] = (signed short int) ((signed short int)(temp + 16384.5)-16384);} }

編碼并寫入

void code_and_write(signed short int *DC, bitstring *DCtable, bitstring *ACtable) {signed short int diff;unsigned char endpos, startpos, i = 1, nz;diff = D2[0]-*DC; //差值*DC = D2[0];//寫入直流值if(diff == 0)writefile(DCtable[0]); //寫入0的huffman編碼else{writefile(DCtable[code_d[diff].length]);//寫入diff長度的huffman編碼writefile(code_d[diff]); //寫入二進制編碼}//寫入交流值for(endpos = 63; (endpos > 0) && (D2[endpos] == 0); --endpos);if(endpos == 0){writefile(ACtable[0x00]);return ;}while(i <= endpos){startpos = i;for(; (D2[i] == 0) && (i <= endpos); ++i);nz = i - startpos;for(;nz >= 16; nz -= 16)//長度大于16需要分多塊writefile(ACtable[0xf0]);writefile(ACtable[nz*16+code_d[D2[i]].length]);writefile(code_d[D2[i]]);++i;}if(endpos != 63)writefile(ACtable[0x00]); //EOB }

寫入具體實現

void writefile(bitstring a) {unsigned short int values = a.value;signed char leng_a=a.length;while(leng_a > 0){if(values & mark[leng_a-1]) //判斷對應位置是否為1bytecode |= mark[bytepos-1];//當前最高位至1leng_a--;bytepos--;if(bytepos <= 0){if(bytecode == 0xff){writebyte(0xff);writebyte(0x00);//說明ff不是段標志}elsewritebyte(bytecode);bytecode = 0;bytepos = 8;}} }

定義結構體等等

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <math.h>//BMP像素結構體 typedef struct {unsigned char B,G,R; }colorRGB;typedef struct{unsigned char B,G,R,a; }colorRGBa;typedef struct{unsigned char length;unsigned short int value; }bitstring;#define PI 3.1415926//寫入文件操作 #define writebyte(b) fputc((b), fp_jpg) #define writeword(w) writebyte((w)/256);writebyte((w)%256);colorRGB *RGB_buf; // 24位 colorRGBa *RGBa_buf; // 32位 signed short int ximage, yimage; //圖片的長和寬 FILE *fp_jpg; //打開jpg文件//二進制編碼 static bitstring *code_u; static bitstring *code_d; //長度以及編碼//存儲YCbCr static signed char YDU[64]; static signed char CbDU[64]; static signed char CrDU[64];static signed short int D2[64];//存儲z型編碼后的值static unsigned char bytecode = 0; static signed char bytepos = 8;//JPG頭SOI1 //圖像識別信息2 static struct APP0 {unsigned short int marker; //段標識和類型FFE0unsigned short int length; // 段長度 16unsigned char JFIFsignature[5]; // 存儲ASCII碼 "JFIF",'\0'unsigned char versionhi; // 主版本號1unsigned char versionlo; // 次版本號1unsigned char xyunits; // 密度單位 0(無單位)unsigned short int xdensity; // 水平方向的密度 1unsigned short int ydensity; // 垂直方向的密度 1unsigned char thumbnwidth; // 略縮圖水平像素數目0unsigned char thumbnheight; // 略縮圖垂直像素數目0 }APP0info={0xFFE0,16,'J','F','I','F',0,1,1,0,1,1,0,0}; //定義量化表3 static struct DQT {unsigned short int marker; // 段標識和類型 0xFFDBunsigned short int length; // 段長度unsigned char QTYinfo; // 亮度QT值 00unsigned char Ytable[64];//內容unsigned char QTCbinfo; // 色度QT值 01unsigned char Cbtable[64]; } DQTinfo; //圖像基本信息SOF0 4 static struct SOF0 {unsigned short int marker; //段標識和類型 0xFFC0unsigned short int length; // 段長度 17unsigned char precision ;// 每個樣本的位數unsigned short int height ; //圖片高度unsigned short int width; //圖片寬度unsigned char nrofcomponents;//組件數量 3unsigned char IdY; // 亮度= 1unsigned char HVY; // 采樣系數 高位標識水平采樣系數，低位表示垂直采樣系數unsigned char QTY; // 量化表號 0unsigned char IdCb; // 紅色分量= 2unsigned char HVCb;unsigned char QTCb; // 1unsigned char IdCr; // 藍色分量= 3unsigned char HVCr;unsigned char QTCr; // Normally equal to QTCb = 1 } SOF0info = { 0xFFC0,17,8,0,0,3,1,0x11,0,2,0x11,1,3,0x11,1}; //定義huffman表 5 static struct DHT {unsigned short int marker; //段標識和類型 0xFFC4unsigned short int length; //段長度 19+n+....unsigned char HTYDCinfo; // 低4位HT號 第5位HT類型 高3位為0unsigned char YDC_codes[16]; //HT位表unsigned char YDC_values[12];// HT值表unsigned char HTYACinfo; // = 0x10unsigned char YAC_codes[16];unsigned char YAC_values[162];unsigned char HTCbDCinfo; // = 1unsigned char CbDC_codes[16];unsigned char CbDC_values[12];unsigned char HTCbACinfo; // = 0x11unsigned char CbAC_codes[16];unsigned char CbAC_values[162]; } DHTinfo; //掃描行開始 6 static struct SOS {unsigned short int marker; //段標識和類型 0xFFDAunsigned short int length; //長度 12unsigned char nrofcomponents; // 掃描行內組件數量 通常為3unsigned char IdY; //1unsigned char HTY; //低4位是AC表號，高4位是DC表號unsigned char IdCb; //2unsigned char HTCb; //0x11unsigned char IdCr; //3unsigned char HTCr; //0x11unsigned char Ss,Se,Bf; // not interesting, they should be 0,63,0 } SOSinfo={0xFFDA,12,3,1,0,2,0x11,3,0x11,0,0x3F,0};//亮度量化表 static unsigned char DQT_Y[64] = {0x08, 0x06, 0x06, 0x07, 0x06, 0x05, 0x08, 0x07,0x07, 0x07, 0x09, 0x09, 0x08, 0x0a, 0x0c, 0x14,0x0d, 0x0c, 0x0b, 0x0b, 0x0c, 0x19, 0x12, 0x13,0x0f, 0x14, 0x1d, 0x1a, 0x1f, 0x1e, 0x1d, 0x1a,0x1c, 0x1c, 0x20, 0x24, 0x2e, 0x27, 0x20, 0x22,0x2c, 0x23, 0x1c, 0x1c, 0x28, 0x37, 0x29, 0x2c,0x30, 0x31, 0x34, 0x34, 0x34, 0x1f, 0x27, 0x39,0x3d, 0x38, 0x32, 0x3c, 0x2e, 0x33, 0x34, 0x32 }; //色差量化表 static unsigned char DQT_C[64] = {0x09, 0x09, 0x09, 0x0c, 0x0b, 0x0c, 0x18, 0x0d,0x0d, 0x18, 0x32, 0x21, 0x1c, 0x21, 0x32, 0x32,0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32,0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32,0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32,0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32,0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32,0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32 };//標準huffman表 static unsigned char dc_y_codes[17]={0,0,1,5,1,1,1,1,1,1,0,0,0,0,0,0,0}; static unsigned char dc_y_values[12]={0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11};static unsigned char dc_cb_codes[17]={0,0,3,1,1,1,1,1,1,1,1,1,0,0,0,0,0}; static unsigned char dc_cb_values[12]={0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11};static unsigned char ac_y_codes[17]={0,0,2,1,3,3,2,4,3,5,5,4,4,0,0,1,0x7d }; static unsigned char ac_y_values[162]= {0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,0xf9, 0xfa };static unsigned char ac_cb_codes[17]={0,0,2,1,2,4,4,3,4,7,5,4,4,0,1,2,0x77}; static unsigned char ac_cb_values[162]={0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,0xf9, 0xfa };//z型編碼 static unsigned char z[64]={ 0, 1, 5, 6,14,15,27,28,2, 4, 7,13,16,26,29,42,3, 8,12,17,25,30,41,43,9,11,18,24,31,40,44,53,10,19,23,32,39,45,52,54,20,22,33,38,46,51,55,60,21,34,37,47,50,56,59,61,35,36,48,49,57,58,62,63 };//按位取值表 static unsigned short int mark[16]={1,2,4,8,16,32,64,128,256,512,1024,2048,4096,8192,16384,32768};

總結

以上是生活随笔為你收集整理的将BMP 格式图片转换为 JPEG 格式【c语言源码】的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。