第1页 / 共13页
第2页 / 共13页
第3页 / 共13页
第4页 / 共13页
第5页 / 共13页
第6页 / 共13页
第7页 / 共13页
第8页 / 共13页
C语言实现24位转换为8位位图.docx
C 语言实现 24 位图转为 8 位灰度图
2010-05-28 11:50:26| 分类： 图像处理 |字号 订阅
#ifndef BMP_H_2_INCLUDED
#define BMP_H_2_INCLUDED
typedef unsigned short WORD;
typedef unsigned long DWORD;
typedef long LONG;
typedef unsigned char BYTE;
typedef struct tagBITMAPFILEHEADER
{ // bmfh
WORD
DWORD
WORD
WORD
DWORD
bfType;
bfSize;
bfReserved1;
bfReserved2;
bfOffBits;
}BITMAPFILEHEADER;
typedef struct tagBITMAPINFOHEADER
{ // bmih
DWORD biSize;
biWidth;
LONG
biHeight;
LONG
WORD
biPlanes;
WORD
biBitCount;
DWORD biCompression;
DWORD biSizeImage;
LONG
LONG
DWORD biClrUsed;
DWORD biClrImportant;
biXPelsPerMeter;
biYPelsPerMeter;
}BITMAPINFOHEADER;
typedef struct tagRGBQUAD
{ // rgbq
BYTE
BYTE
BYTE
BYTE
rgbBlue;
rgbGreen;
rgbRed;
rgbReserved;
}RGBQUAD;
typedef struct tagBITMAPINFO
{
BITMAPINFOHEADER bmiHeader;
RGBQUAD bmiColors[1];
}BITMAPINFO;
#endif // BMP_H_2_INCLUDED
#include
#include
#include
#include
#include
#include
#include "bmp_2.h"
BITMAPFILEHEADER bmfh;
BITMAPINFOHEADER bmih;
BITMAPFILEHEADER bf8;
BITMAPINFOHEADER bi8;
BYTE *imgData;
BYTE *NewImgData;
void readData();
int ReadFileHeader(BITMAPFILEHEADER *);
int ReadInfoHeader(BITMAPINFOHEADER *);
int ReadPixelData(BYTE *);
void PrintFileHeader(BITMAPFILEHEADER *);
void PrintInfoHeader(BITMAPINFOHEADER *);
LONG GetLineBytes(int,int);
int ConVerTo8BitGray(char *);
void readData()
{
int i,k,h;
DWORD dwLineBytes;
i = ReadFileHeader(&bmfh);
if(i == 0)
{
printf("Read file header successful!\n");
}
k = ReadInfoHeader(&bmih);
if(k == 0)
{
printf("Read info header successful!\n");
}
dwLineBytes = GetLineBytes(bmih.biWidth,bmih.biBitCount);
imgData = (BYTE*)malloc(dwLineBytes*bmih.biHeight*sizeof(BYTE));
h = ReadPixelData(imgData);
if(h == 0)
{
printf("Read pixel data successful!\n");
}
if(i==0&&k==0&&h==0)
{
printf("Read datas successful!\n");
}
}
int ReadFileHeader(BITMAPFILEHEADER *bmfh) //读文件头文件
{
FILE *dataFile;
dataFile = fopen("shuaige.bmp","r");
if(fread(&bmfh->bfType,sizeof(WORD),1,dataFile)!=1)
//读入文件头文件中的文件类型元
素
{
}
printf("Can not read bfType in the file header.\n");
fclose(dataFile);
return -1;
if(fread(&bmfh->bfSize,sizeof(DWORD),1,dataFile)!=1)
{
printf("Can not read bfSize in the file header.\n");
fclose(dataFile);
return -1;
}
//读入文件大小元素
if(fread(&bmfh->bfReserved1,sizeof(WORD),1,dataFile)!=1) //必须设置为 0
{
printf("Can not read bfReserved1 in the file header.\n");
fclose(dataFile);
return -1;
}
if(fread(&bmfh->bfReserved2,sizeof(WORD),1,dataFile)!=1) //必须设置为 0
{
printf("Can not read bfReserved2 in the file header.\n");
fclose(dataFile);
return -1;
}
if(fread(&bmfh->bfOffBits,sizeof(DWORD),1,dataFile)!=1) //从文件头开始到实际图像数据
之间的字节偏移量
{
}
printf("Can not read bfOffBits in the file header.\n");
fclose(dataFile);
return -1;
fclose(dataFile);
return 0;
}
int ReadInfoHeader(BITMAPINFOHEADER *bmih) //读信息头文件
{
FILE *dataFile;
dataFile = fopen("shuaige.bmp","r");
fseek(dataFile,14,SEEK_SET); //文件指针跳过文件头
if(fread(&bmih->biSize,sizeof(DWORD),1,dataFile)!=1) //读入信息头文件结构所需要的字
节数
{
}
printf("Can not read biSize in the info header.\n");
fclose(dataFile);
return -1;
if(fread(&bmih->biWidth,sizeof(LONG),1,dataFile)!=1) //读入图像宽度
{
printf("Can not read biWidth in the info header.\n");
fclose(dataFile);
return -1;
}
if(fread(&bmih->biHeight,sizeof(LONG),1,dataFile)!=1) //读入图像高度
{
printf("Can not read biHeight in the info header.\n");
fclose(dataFile);
return -1;
}
if(fread(&bmih->biPlanes,sizeof(WORD),1,dataFile)!=1) //读入位图平面数，总是设置为 1
{
printf("Can not read biPlanes in the info header.\n");
fclose(dataFile);
return -1;
}
if(fread(&bmih->biBitCount,sizeof(WORD),1,dataFile)!=1) //读入比特数，即位图的位数
{
printf("Can not read biBitCount in the info header.\n");
fclose(dataFile);
return -1;
}
if(fread(&bmih->biCompression,sizeof(DWORD),1,dataFile)!=1) //说明图像数据压缩类型
{
printf("Can not read biCompression in the info header.\n");
fclose(dataFile);
return -1;
}
if(fread(&bmih->biSizeImage,sizeof(DWORD),1,dataFile)!=1) //读入图像大小
{
printf("Can not read biSizeImage in the info header.\n");
fclose(dataFile);
return -1;
}
if(fread(&bmih->biXPelsPerMeter,sizeof(LONG),1,dataFile)!=1) //说明水平分辨率
{
printf("Can not read biXPelsPerMeter in the info header.\n");
fclose(dataFile);
return -1;
}
if(fread(&bmih->biYPelsPerMeter,sizeof(LONG),1,dataFile)!=1) //说明垂直分辨率
{
printf("Can not read biYPelsPerMeter in the info header.\n");
fclose(dataFile);
return -1;
}
if(fread(&bmih->biClrUsed,sizeof(DWORD),1,dataFile)!=1) //说明位图实际使用的彩色表中
颜色索引数
{
}
printf("Can not read biClrUsed in the info header.\n");
fclose(dataFile);
return -1;
if(fread(&bmih->biClrImportant,sizeof(DWORD),1,dataFile)!=1) //说明对图像显示有重要影
响的颜色索引数
{
}
printf("Can not read biClrImportant in the info header.\n");
fclose(dataFile);
return -1;
fclose(dataFile);
return 0;
}
int ReadPixelData(BYTE *imgData) //读取像素数据
{
BYTE *data;
FILE *dataFile;
DWORD dwLineBytes;
dwLineBytes = GetLineBytes(bmih.biWidth,bmih.biBitCount);
data = (BYTE *)malloc(dwLineBytes*bmih.biHeight*sizeof(BYTE));
dataFile = fopen("shuaige.bmp","rb");
if(bmih.biBitCount==8)
{
fseek(dataFile,bmfh.bfOffBits,SEEK_SET);
}
else if(bmih.biBitCount==24)
{
fseek(dataFile,bmfh.bfOffBits,SEEK_SET);
}
else
{
}
printf("Only Support: 8 or 24 bits.\n");
free(data);
fclose(dataFile);
return -1;
if(fread(data,dwLineBytes*bmih.biHeight*sizeof(BYTE),1,dataFile)!=1)
{
printf("Can not read the pixel data.\n");
free(data);
fclose(dataFile);
return -1;
}
memcpy(imgData,data,dwLineBytes*bmih.biHeight*sizeof(BYTE));
free(data);
fclose(dataFile);
return 0;
}
void PrintFileHeader(BITMAPFILEHEADER *ibmfh) //打印文件头信息
{
printf("The contents in the file header of the BMP file:\n");
printf("bfOffBits: %ld\n",ibmfh->bfOffBits);
printf("bfReserved1: %ld\n",ibmfh->bfReserved1);
printf("bfReserved2: %ld\n",ibmfh->bfReserved2);
printf("bfSize: %ld\n",ibmfh->bfSize);
printf("bfType: %ld\n",ibmfh->bfType);
}
void PrintInfoHeader(BITMAPINFOHEADER *ibmih) //打印信息头信息
{
printf("The content in the info header of the BMP file:\n");
printf("biBitCount: %ld\n",ibmih->biBitCount);
printf("biClrImportant: %ld\n",ibmih->biClrImportant);
printf("biClrUsed: %ld\n",ibmih->biClrUsed);
printf("biCompression: %ld\n",ibmih->biCompression);
printf("biHeight: %ld\n",ibmih->biHeight);
printf("biPlanes: %ld\n",ibmih->biPlanes);
printf("biSize: %ld\n",ibmih->biSize);
printf("biSizeImage: %ld\n",ibmih->biSizeImage);
printf("biWidth: %ld\n",ibmih->biWidth);
printf("biXPelsPerMeter: %ld\n",ibmih->biXPelsPerMeter);
printf("biYPelsPerMeter: %ld\n",ibmih->biYPelsPerMeter);
}
LONG GetLineBytes(int imgWidth,int bitCount) //计算每行像素所占的字节数
{
return (imgWidth*bitCount+31)/32*4;
}
int ConVerTo8BitGray(char *filepath) //24 位图转换 8 位图
{
int i,j,k;
FILE *dataFile;
DWORD dwLineBytes8;
DWORD dwLineBytes24;
RGBQUAD pal[256];
dwLineBytes24 = GetLineBytes(bmih.biWidth,24);
dwLineBytes8 = GetLineBytes(bmih.biWidth,8);
NewImgData = (BYTE *)malloc(dwLineBytes8*bmih.biHeight*sizeof(BYTE));
for(i=0; i
相关推荐
2023年江西萍乡中考道德与法治真题及答案.doc
2012年重庆南川中考生物真题及答案.doc
2013年江西师范大学地理学综合及文艺理论基础考研真题.doc
2020年四川甘孜小升初语文真题及答案I卷.doc
2020年注册岩土工程师专业基础考试真题及答案.doc
2023-2024学年福建省厦门市九年级上学期数学月考试题及答案.doc
2021-2022学年辽宁省沈阳市大东区九年级上学期语文期末试题及答案.doc
2022-2023学年北京东城区初三第一学期物理期末试卷及答案.doc
2018上半年江西教师资格初中地理学科知识与教学能力真题及答案.doc
2012年河北国家公务员申论考试真题及答案-省级.doc
2020-2021学年江苏省扬州市江都区邵樊片九年级上学期数学第一次质量检测试题及答案.doc
2022下半年黑龙江教师资格证中学综合素质真题及答案.doc
