bmp图像增强（c语言）

//Linear gray level transformation //input origin_image_file_name //output result_image_file_name //compile #include<stdio.h> #include <stdlib.h> #define IMAGE_SIZE_ROW 256 #define IMAGE_SIZE_COL 256 unsigned char origin_image[IMAGE_SIZE_ROW][IMAGE_SIZE_COL]; unsigned char result_image[IMAGE_SIZE_ROW][IMAGE_SIZE_COL]; int argc; char *argv[]; void main(){ FILE *I_file,*O_file; char origin_image_file_name[80]; char result_image_file_name[80]; int i,j,a,b,c,d,m,n; float zzba,zzac,zzbd; unsigned char *bmp_head; //prompt user to input arguments(提示用户输入参数) printf("origin_image_file_name-->"); scanf("%s",origin_image_file_name);printf("\n"); printf("result_image_file_name-->"); scanf("%s",result_image_file_name);printf("\n"); printf("limits in the original image[a,b]-->"); scanf("%d%d",&a,&b);printf("\n"); printf("limits in the result image[c,d]-->"); scanf("%d%d",&c,&d);printf("\n"); //read image file from disk to memory(图像文件从磁盘读取到内存) if((I_file=fopen(origin_image_file_name,"rb"))==NULL){ printf("file open error!");exit(-1);} bmp_head=(unsigned char*)malloc(1078); fread(bmp_head,1,1078,I_file); if((O_file=fopen(result_image_file_name,"wb"))==NULL){ printf("file open error!"); exit(-1);} for(i=0;i<IMAGE_SIZE_ROW;i++) fread(origin_image[i],sizeof(unsigned char),IMAGE_SIZE_COL,I_file); fclose(I_file); //grey level transform(灰度变换) zzba=(d-c)/(float)(b-a); zzac=c/(float)a; zzbd=(n-d)/(float)(m-b); for(i=0;i<IMAGE_SIZE_ROW;i++) for(j=0;j<IMAGE_SIZE_COL;j++){ if(origin_image[i][j]<=a)result_image[i][j]=zzac*origin_image[i][j]; else{ if (origin_image[i][j]>=b)result_image[i][j]=zzbd*(origin_image[i][j]-b)+d; else result_image[i][j]=zzba*(origin_image[i][j]-a)+c; } } fwrite(bmp_head,1,1078,O_file); //saving the transformed image to disk(转换后的图像保存到磁盘) for(i=0;i<IMAGE_SIZE_ROW;i++) fwrite(result_image[i],sizeof(unsigned char),IMAGE_SIZE_COL,O_file); fclose(O_file); } //Linear gray level from lastnemo@sohu.com