信息熵_C++_图像信息熵C++_

#include<stdio.h> #include<stdlib.h> #include<math.h> float value[256]={0.0}; int fread(unsigned char *pData) //把声明的那个数组空间指针作为参数来回传 { FILE *fp; char filename[100]; //文件名 printf("请输入你要打开的文件名及路径，如c:\\temp.txt\n"); gets(filename); //这句要用户输入文件名 if((fp=fopen(filename,"r+"))==NULL){ printf("Open the file failure...\n"); exit(0); } fread(pData,sizeof(unsigned char),(256*256),fp); fclose(fp); return 0; // } int fchuli(unsigned char *pData) { for(int i=0;i<(256*256);i++) //统计灰度值 { value[pData[i]]++; } return 0; // } void fwrite(unsigned char *pData) { //FILE *fp; //fp=fopen("result.txt","wb"); //fprintf(fp,"灰度值\t\t大小\r\n"); double result = 0; double sum = 0; for(int j=0;j<256;j++) { //printf("%d\t\t%d\n",j,value[j]); // fwrite(value,sizeof(int),256,fp); // fwrite(value,sizeof(int),256,fp); value[j] = value[j]/(256*256); if (value[j] == 0.0) result = 0; else result = value[j]*(log(value[j])/log(2.0)); //printf("%d\t",sum); sum = sum-result; //printf("%d\t\t%f\r\n",j,result); } printf("%f\t",sum); delete[] pData;//删除空间 //fclose(fp); //关闭txt文件 return ; // } int main(unsigned char *pData) { pData=new unsigned char[256*256]; //在主函数里声明新空间 fread(pData); //传数组地址 fchuli(pData); fwrite(pData); return 0; }