#define IMAGE_H
void image_info(FILE* file)
void image_save(FILE *file)
void image_gray()
void image_binarization()
void image_opposite()
void image_channel() //抽取RGB通道
void image_bright()//改变图像亮度
typedef struct BMP
{
//14字节
unsigned shortbfType //文件标识 2字节 必须为BM
unsigned int bfSize //文件大小 4字节
unsigned shortbfReserved1 //保留，每字节以"00"填写 2字节
unsigned shortbfReserved2 //同上 2字节
unsigned int bfOffBits //记录图像数据区的起始位置(图象数据相对于文件头字节的偏移量)。 4字节
//40字节
unsigned int biSize //表示本结构的大小 4字节
intbiWidth //位图的宽度 4字节
intbiHeight //位图的高度 4字节
unsigned short biPlanes //永远为1 , 2字节
unsigned short biBitCount //位图的位数 分为1 4 8 16 24 32 2字节
unsigned int biCompression //压缩说明 4字节
unsigned int biSizeImage //表示位图数据区域的大小以字节为单位 4字节
int biXPelsPerMeter //用象素/米表示的水平分辨率 4字节
int biYPelsPerMeter //用象素/米表示的垂直分辨率 4字节
unsigned int biClrUsed //位图使用的颜色索引数 4字节
unsigned int biClrImportant //对图象显示有重要影响的颜色索引的数目 4字节
} BMP
int line_byte
unsigned char *imagedata
extern BMP bmp
extern int line_byte
extern unsigned char *imagedata
#endif
//image_rw.c文件
#include<stdio.h>
#include<stdlib.h>
#include"image.h"
void image_info(FILE *file)
{
int times=3//输入文件名次数。
char bmp_name[10] //文件名
printf("\nplease enter a file name for reading:")
do
{
if (times<3)
{
printf("\nplease enter a file name for reading again:")
}
fflush(stdin)
gets(bmp_name)
//printf("\n%s",bmp_name)
file=fopen(bmp_name,"rb+") //打开一个文件进行读写操作。
--times
if (file==NULL)
{
printf("\nerror opening %s for reading! ",bmp_name)
}
else
{
break
}
}
while(times!=0)
if (times==0)
{
printf("\nsorry, shutdown!")
exit(1)
}
//读取图像信息
fseek(file,0L,0)//读取图像文件类型
fread(&bmp,sizeof(BMP),1,file)
printf("\n bmp tpye:%u",bmp.bfType)
printf("\n bmp size:%u",bmp.bfSize)
printf("\n bmp reserved1:%u",bmp.bfReserved1)
printf("\n bmp reserved2:%u",bmp.bfReserved2)
printf("\n bmp offBits: %u",bmp.bfOffBits)
printf("\n bmp bisize: %u",bmp.biSize)
printf("\n bmp biWidth: %d",bmp.biWidth)
printf("\n bmp biHeight: %d",bmp.biHeight)
printf("\n bmp biplans: %u",bmp.biPlanes)
printf("\n bmp biBitCount: %u",bmp.biBitCount)
printf("\n bmp biCompression: %u",bmp.biCompression)
printf("\n bmp biSizeImage: %u",bmp.biSizeImage)
printf("\n bmp biXPelsPerMeter: %d",bmp.biXPelsPerMeter)
printf("\n bmp biYPelsPerMeter: %d",bmp.biYPelsPerMeter)
printf("\n bmp biClrUsed: %u",bmp.biClrUsed)
printf("\n bmp biClrImportant: %u\n",bmp.biClrImportant)
line_byte=(bmp.biWidth*bmp.biBitCount/8+3)/4*4//获得图像数据每行的数据个数
//printf("dfsa%u",bmp.line_byte)
//bmp.imagedata=NULL
imagedata=(unsigned char*)malloc(bmp.biSizeImage)
fseek(file,(long)bmp.bfOffBits,0)
fread(imagedata,sizeof(unsigned char),bmp.biSizeImage,file)
fclose(file)
}
//保存图像
void image_save(FILE *file)
{
int times=3//输入文件名次数。
char bmp_name[10] //文件名
//int i //记录数据区个数
printf("\nplease enter a file name for writeing:")
do
{
if (times<3)
{
printf("\nplease enter a file name for writeing again:")
}
fflush(stdin)
gets(bmp_name)
printf("\n%s",bmp_name)
file=fopen(bmp_name,"wb+") //打开一个文件进行读写操作。
--times
if (file==NULL)
{
printf("\nerror opening %s for writing",bmp_name)
}
else
{
break
}
}
while(times!=0)
if (times==0)
{
printf("\nsorry, shutdown!")
exit(1)
}
//写文件头
printf("\n%s",bmp_name)
fseek(file,0L,0)//图像文件类型
fwrite(&(bmp.bfType),sizeof(short),1,file)
printf("\n bmp tpye:%d",bmp.bfType)
fseek(file,2L,0)//图像文件大小
fwrite(&(bmp.bfSize),sizeof(int),1,file)
printf("\n bmp size:%d",bmp.bfSize)
fseek(file,6L,0)//图像文件保留字1
fwrite(&(bmp.bfReserved1),sizeof(short),1,file)
printf("\n bmp reserved1:%d",bmp.bfReserved1)
fseek(file,8L,0)//图像文件保留字2
fwrite(&(bmp.bfReserved2),sizeof(short),1,file)
printf("\n bmp reserved2:%d",bmp.bfReserved2)
fseek(file,10L,0)//数据区的偏移量
fwrite(&(bmp.bfOffBits),sizeof(short),1,file)
printf("\n bmp offBits: %d",bmp.bfOffBits)
fseek(file,14L,0)//文件头结构大小
fwrite(&(bmp.biSize),sizeof(int),1,file)
printf("\n bmp bisize: %d",bmp.biSize)
fseek(file,18L,0)//图像的宽度
fwrite(&(bmp.biWidth),sizeof(int),1,file)
printf("\n bmp biWidth: %d",bmp.biWidth)
fseek(file,22L,0)//图像的高度
fwrite(&(bmp.biHeight),sizeof(int),1,file)
printf("\n bmp biHeight: %d",bmp.biHeight)
fseek(file,24L,0)//图像的面数
fwrite(&(bmp.biPlanes),sizeof(short),1,file)
printf("\n bmp biplans: %d",bmp.biPlanes)
fseek(file,28L,0)//图像一个像素的字节数
fwrite(&(bmp.biBitCount),sizeof(short),1,file)
printf("\n bmp biBitCount: %d",bmp.biBitCount)
fseek(file,30L,0)//图像压缩信息
fwrite(&(bmp.biCompression),sizeof(short),1,file)
printf("\n bmp biCompression: %d",bmp.biCompression)
fseek(file,34L,0)//图像数据区的大小
fwrite(&(bmp.biSizeImage),sizeof(int),1,file)
printf("\n bmp biSizeImage: %d",bmp.biSizeImage)
fseek(file,38L,0)//水平分辨率
fwrite(&(bmp.biXPelsPerMeter),sizeof(int),1,file)
printf("\n bmp biXPelsPerMeter: %d",bmp.biXPelsPerMeter)
fseek(file,42L,0)//垂直分辨率
fwrite(&(bmp.biYPelsPerMeter),sizeof(int),1,file)
printf("\n bmp biYPelsPerMeter: %d",bmp.biYPelsPerMeter)
fseek(file,46L,0)//颜色索引数
fwrite(&(bmp.biClrUsed),sizeof(int),1,file)
printf("\n bmp biClrUsed: %d",bmp.biClrUsed)
fseek(file,50L,0)//重要颜色索引数
fwrite(&(bmp.biClrImportant),sizeof(int),1,file)
printf("\n bmp biClrImportant: %d\n",bmp.biClrImportant)
fseek(file,(long)(bmp.bfOffBits),0)
fwrite(imagedata,sizeof(unsigned char),bmp.biSizeImage,file)
fclose(file)
}
//pixProcess.c文件
#include<stdio.h>
#include<stdlib.h>
#include<math.h>
#include"image.h"
//灰度化
void image_gray()
{
int i,j
unsigned char tmp
for (i=0i<bmp.biHeighti++)
{
for (j=0j<line_byte/3j++)
{
tmp=0.11*(*(imagedata+i*line_byte+j*3+0))+0.59*(*(imagedata+i*line_byte+j*3+1))+0.3*(*(imagedata+i*line_byte+j*3+2))
imagedata[i*line_byte+j*3+0]=tmp
imagedata[i*line_byte+j*3+1]=tmp
imagedata[i*line_byte+j*3+2]=tmp
//printf("\nnidsfh%d%d",i,j)
}
}
}
//二值化
void image_binarization()
{
int i,j
for (i=0i<bmp.biHeighti++)
{
for (j=0j<line_bytej++)
{
if ((*(imagedata+i*line_byte+j))<128)
{
imagedata[i*line_byte+j]=0
}
else
{
imagedata[i*line_byte+j]=255
}
}
}
}
void image_opposite() //反相
{
int i,j
for (i=0i<bmp.biHeighti++)
{
for (j=0j<line_bytej++)
{
imagedata[i*line_byte+j]=abs(255-imagedata[i*line_byte+j])
}
}
}
void image_channel() //抽取RGB通道
{
int i,j
char rgb
printf("\nplease enter a char(r/g/b): ")
fflush(stdin)
scanf("%c",&rgb)
if (rgb=='b')
{
for (i=0i<bmp.biHeighti++)
{
for (j=0j<line_byte/3j++)
{
imagedata[i*line_byte+3*j+1]=0
imagedata[i*line_byte+3*j+2]=0
}
}
}
else if(rgb=='g')
{
for (i=0i<bmp.biHeighti++)
{
for (j=0j<line_byte/3j++)
{
imagedata[i*line_byte+3*j]=0
imagedata[i*line_byte+3*j+2]=0
}
}
}
else
{
for (i=0i<bmp.biHeighti++)
{
for (j=0j<line_byte/3j++)
{
imagedata[i*line_byte+3*j]=0
imagedata[i*line_byte+3*j+1]=0
}
}
}
}
void image_bright()//改变图像亮度
{
int level
int i,j
printf("\n please enter the level of brightness[-255 to 255] :")
fflush(stdin)
scanf("%d",&level)
for (i=0i<bmp.biHeighti++)
{
for (j=0j<line_bytej++)
{
if (level>=0)
{
if ((imagedata[i*line_byte+j]+level)>255)
imagedata[i*line_byte+j]=255
else
imagedata[i*line_byte+j]+=level
}
else
{
if ((imagedata[i*line_byte+j]-abs(level))<0)
imagedata[i*line_byte+j]=0
else
imagedata[i*line_byte+j]+=level
}
}
}
}
//void image_create() //创建一幅24位BMP图像文件。
//{
//main.c文件
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<conio.h>
#include"image.h"
BMP bmp
int main()
{
FILE *file=NULL
int choose
char gono
do
{
image_info(file) //imagedata已经分配了动态内存，但是没有释放
printf("\n 1.image_opposite")
printf("\n 2.image_gray")
printf("\n 3.image_binarization")
printf("\n 4.image_channel")
printf("\n 5.image_brightness")
//printf("6.image_opposite")
//printf("7.image_opposite")
printf("\nchoose your options:")
fflush(stdin)
scanf("%d",&choose)
switch(choose)
{
case 1:
image_opposite()
image_save(file)
free(imagedata)
break
case 2:
image_gray()
image_save(file)
free(imagedata)
break
case 3:
image_binarization()
image_save(file)
free(imagedata)
break
case 4:
image_channel()
image_save(file)
free(imagedata)
break
case 5:
image_bright()
image_save(file)
free(imagedata)
break
default:
printf("\n wrong choose!")
}
printf("\nlet's go on?(y/n):")
fflush(stdin)
scanf("%c",&gono)
if (gono=='n')
{
printf("\nbye bye!")
break
}
}
while(1)
return 0
}
没有标准函数读。需要根据BMP文件的结构定义，读出头部和每个颜色值。
struct
header
{
unsigned
short
int
bfType
unsigned
int
bfSize
unsigned
short
int
bfReserved1
unsigned
short
int
bfReserved2
unsigned
int
bfoffBits
}__attribute__
((packed))
struct
tinfoheader
{
unsigned
int
biSize
unsigned
int
biWidth
unsigned
int
biHeight
unsigned
short
int
biPlanes
unsigned
short
int
biBitCount
unsigned
int
biCompression
unsigned
int
biSizeImage
unsigned
int
biXPelsPerMeter
unsigned
int
biYPelsPerMeter
unsigned
int
biClrUsed
unsigned
int
biClrImportant
}__attribute__
((packed))
