RGB文件与YUV文件格式
RGB到YUV的转换公式
c 代码实现
结果展示
RGB文件与YUV文件格式
RGB按三个分量B、G、R顺序存储(4:4:4)
此次选用YUV420文件格式，每四个Y共用一组U、V分量(4:2:0)
RGB到YUV的转换公式
Y = 0.299 R 0.587 G 0.114 B
U = - 0.1687 R - 0.3313 G 0.5 B 128
V = 0.5 R - 0.4187 G - 0.0813 B 128
c 代码实现
#include <stdio.h> #include <cstring> #include <cstdlib> using namespace std; int main(int argc, char* argv[]) { FILE *fp = NULL; FILE *out_yuv = NULL; if (!(fp=fopen(argv[1], "rb"))) { printf("输入rgb文件打开失败！(fp=fopen(argv[1], "rb"))) { printf("输入rgb文件打开失败！\n"); } if (!(out_yuv=fopen( argv[2], "wb") )) { printf("输出yuv文件打开失败！\n"); } int w,h; w = atoi(argv[3]); h = atoi(argv[4]); unsigned char* buffer = (unsigned char *)malloc(sizeof(unsigned char)*w*h * 3); unsigned char* ybuf = (unsigned char *)malloc(sizeof(unsigned char)*w*h); unsigned char* ubuf = (unsigned char *)malloc(sizeof(unsigned char)*w*h/4); unsigned char* vbuf = (unsigned char *)malloc(sizeof(unsigned char)*w*h/4); fread(buffer, sizeof(unsigned char), 3 * w * h, fp); int uvnum=0; for (int i = 0; i < w*h; i ) { ybuf[i] = 0.299 * buffer[3 * i 2] 0.587 * buffer[3 * i 1] 0.114 * buffer[3 * i]; if (ybuf[i] <= 15) ybuf[i] = 16; if (ybuf[i] >=236) ybuf[i] =235; } for(int i = 0;i < h;i ) { for (int j = 0; j < w; j ) { if (i % 2 == 0 && j % 2 == 0) { ubuf[uvnum] = -0.1684 * buffer[3 * (i * w j) 2] - 0.3316 * buffer[3 * (i * w j) 1] 0.5 * buffer[3 * (i * w j)] 128; if (ubuf[i] <= 15) ubuf[i] = 16; if (ubuf[i] >= 241) ubuf[i] = 240; vbuf[uvnum] = 0.5 * buffer[3 * (i * w j) 2] - 0.4187 * buffer[3 * (i * w j) 1] - 0.0183 * buffer[3 * (i * w j)] 128; if (vbuf[uvnum] <= 15) vbuf[uvnum] = 16; if (vbuf[uvnum] >= 241) vbuf[uvnum] = 240; uvnum ; } } } fwrite(ybuf, sizeof(unsigned char), w*h, out_yuv); fwrite(ubuf, sizeof(unsigned char), w*h / 4, out_yuv); fwrite(vbuf, sizeof(unsigned char), w*h / 4, out_yuv); fclose(fp); fclose(out_yuv); free(buffer); free(ybuf); free(ubuf); free(vbuf); getchar(); return 0; } 并设置命令行参数