对图像数据进行二抽取

#include "stdio.h"#include "stdlib.h"int main(int argc, char* argv[]){char *fName = "brainlabelz126.raw";char *fNewName = "Newbrainlabelz126.raw";int fileSize = 256 * 256;char* buffer = (char*)malloc(256 * 256 / 4);int i, j;FILE *fp=fopen(fName,"rb"); if(fp==0) { fprintf(stderr, "can't open file %s!/n", fName); exit(1); }FILE *fpNew=fopen(fNewName,"wb"); if(fpNew==0) { fprintf(stderr, "can't open file %s!/n", fNewName); exit(1); }for(i = 0; i < 256; i += 2)for(j = 0; j < 256; j +=2){fseek(fp, i * 256 + j, 0);fread(buffer, 1, 1, fp);fwrite(buffer, 1, 1, fpNew);}}

 

brainlabelz126.raw是256X256的图像数据，Newbrainlabelz126.raw是二抽取后的128X128的图像数据