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YUYV格式到RGB格式的转换

为什么YUYV格式要转到RGB格式,视频的显示调用的多数API都是基于RGB格式,所以需要进行格式的转换。

YUYV格式如下:
Y0U0Y1V0 Y2U1Y3V1..........
说明:一个Y代表一个像素,而一个Y和UV组合起来构成一个像素,所以第0个像素Y0和第一个像素Y1都是共用第0个像素的U0和V0。而每个分量Y,U,V都是占用一个字节的存储空间。所以Y0U0Y1V0相当于两个像素,占用了4个字节的存储空间,平均一个像素占用两个字节。

RGB格式:
R0G0B0 R1G1B1.........
说明:一个像素由三个分量构成,即一个像素占用三个字节。

YUV到RGB的转换有如下公式:
R = 1.164*(Y-16) + 1.159*(V-128);
G = 1.164*(Y-16) - 0.380*(U-128)+ 0.813*(V-128);
B = 1.164*(Y-16) + 2.018*(U-128));

 1 int yuvtorgb0(unsigned char *yuv, unsigned char *rgb, unsigned int width, unsigned int height) 2 { 3     unsigned int in, out; 4     int y0, u, y1, v; 5     unsigned int pixel24; 6     unsigned char *pixel = (unsigned char *)&pixel24; 7     unsigned int size = width*height*2; 8  9     for (in = 0, out = 0; in < size; in += 4, out += 6)10     {11         y0 = yuv[in+0];12         u  = yuv[in+1];13         y1 = yuv[in+2];14         v  = yuv[in+3];15 16         sign3 = true;17         pixel24 = yuvtorgb(y0, u, v);18         rgb[out+0] = pixel[0];    //for QT19         rgb[out+1] = pixel[1];20         rgb[out+2] = pixel[2];21         //rgb[out+0] = pixel[2];  //for iplimage22         //rgb[out+1] = pixel[1];23         //rgb[out+2] = pixel[0];24     25         //sign3 = true;26         pixel24 = yuvtorgb(y1, u, v);27         rgb[out+3] = pixel[0];28         rgb[out+4] = pixel[1];29         rgb[out+5] = pixel[2];30         //rgb[out+3] = pixel[2];31         //rgb[out+4] = pixel[1];32         //rgb[out+5] = pixel[0];33     }34     return 0;35 }36 37 int yuvtorgb(int y, int u, int v)38 {39     unsigned int pixel24 = 0;40     unsigned char *pixel = (unsigned char *)&pixel24;41     int r, g, b;42     static long int ruv, guv, buv;43 44     if (sign3)45     {46         sign3 = false;47         ruv = 1159*(v-128);48         guv = 380*(u-128) + 813*(v-128);49         buv = 2018*(u-128);50     }51 52     r = (1164*(y-16) + ruv) / 1000;53     g = (1164*(y-16) - guv) / 1000;54     b = (1164*(y-16) + buv) / 1000;55 56     if (r > 255) r = 255;57     if (g > 255) g = 255;58     if (b > 255) b = 255;59     if (r < 0) r = 0;60     if (g < 0) g = 0;61     if (b < 0) b = 0;62 63     pixel[0] = r;64     pixel[1] = g;65     pixel[2] = b;66 67     return pixel24;68 }

 http://blog.chinaunix.net/uid-21410064-id-3248638.html

YUYV格式到RGB格式的转换