示例：

640*480 NV12圖像，提取Y部分數據，將Y數據做降采樣，隔行隔列取值，保存成文件。

#include <stdio.h> #include <string.h>#define WIDTH_ORIGIN (640) #define HEIGHT_ORIGIN (480) #define WIDTH_BINNING (320) #define HEIGHT_BINNING (240)char image_buffer[WIDTH_ORIGIN * HEIGHT_ORIGIN]; char binn_buffer[WIDTH_BINNING * HEIGHT_BINNING];int main() {int i = 0;int j = 0;unsigned int addr = 0;char *originimage = "640_480.yuv";FILE *imagefile = fopen(originimage,"a+");if(NULL == imagefile){printf("open file[%s] failed!\n", originimage);return -1;}memset((void*)image_buffer,0,WIDTH_ORIGIN * HEIGHT_ORIGIN);fread((void*)image_buffer, 1, WIDTH_ORIGIN* HEIGHT_ORIGIN, imagefile);fclose(imagefile);for(i = 0; i < HEIGHT_BINNING; i++){for(j = 0; j < WIDTH_BINNING; j++){binn_buffer[i * WIDTH_BINNING + j] = image_buffer[i * WIDTH_ORIGIN * 2 + 2 * j];}}char *binnimage = "binn.yuv";FILE *fp_binn = fopen(binnimage,"a+");if(NULL == fp_binn){printf("open file[%s] failed!\n", binnimage);return -1;}fwrite((void*)binn_buffer, 1, WIDTH_BINNING * HEIGHT_BINNING, fp_binn);fclose(fp_binn);}

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