YUV420、YUV422、RGB24转换

最新推荐文章于 2020-02-14 15:30:06 发布

wmnmtm

最新推荐文章于 2020-02-14 15:30:06 发布

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本文链接：https://blog.youkuaiyun.com/wmnmtm/article/details/82922039

本文介绍了平面YUV422到RGB24、YUV420到YUV422再到RGB24的转换算法。通过具体的C语言代码实现，展示了如何处理亮度与色度信号，并详细解释了色彩空间转换的过程。

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//平面YUV422转平面RGB24
static void YUV422p_to_RGB24(unsigned char *yuv422[3], unsigned char *rgb24, int width, int height)
{
int R,G,B,Y,U,V;
int x,y;
int nWidth = width>>1; //色度信号宽度
for (y=0;y<height;y++)
{
for (x=0;x<width;x++)
{
   Y = *(yuv422[0] + y*width + x);
   U = *(yuv422[1] + y*nWidth + (x>>1));
   V = *(yuv422[2] + y*nWidth + (x>>1));
   R = Y + 1.402*(V-128);
   G = Y - 0.34414*(U-128) - 0.71414*(V-128);
   B = Y + 1.772*(U-128);

   //防止越界
   if (R>255)R=255;
   if (R<0)R=0;
   if (G>255)G=255;
   if (G<0)G=0;
   if (B>255)B=255;
   if (B<0)B=0;

   *(rgb24 + ((height-y-1)*width + x)*3) = B;
   *(rgb24 + ((height-y-1)*width + x)*3 + 1) = G;
   *(rgb24 + ((height-y-1)*width + x)*3 + 2) = R;
}
}
}

//平面YUV420转平面YUV422
static void YUV420p_to_YUV422p(unsigned char *yuv420[3], unsigned char *yuv422, int width, int height)
{
int x, y;
//亮度信号Y复制
int Ylen = width*height;
memcpy(yuv422, yuv420[0], Ylen);
//色度信号U复制
unsigned char *pU422 = yuv422 + Ylen; //指向U的位置
int Uwidth = width>>1; //422色度信号U宽度
int Uheight = height>>1; //422色度信号U高度
for (y = 0; y < Uheight; y++)
{
memcpy(pU422 + y*width,          yuv420[1] + y*Uwidth, Uwidth);
memcpy(pU422 + y*width + Uwidth, yuv420[1] + y*Uwidth, Uwidth);
}
//色度信号V复制
unsigned char *pV422 = yuv422 + Ylen + (Ylen>>1); //指向V的位置
int Vwidth = Uwidth; //422色度信号V宽度
int Vheight = Uheight; //422色度信号U宽度
for (y = 0; y < Vheight; y++)
{
memcpy(pV422 + y*width,          yuv420[2] + y*Vwidth, Vwidth);
memcpy(pV422 + y*width + Vwidth, yuv420[2] + y*Vwidth, Vwidth);
}
}

//平面YUV420转RGB24
static void YUV420p_to_RGB24(unsigned char *yuv420[3], unsigned char *rgb24, int width, int height)
{
// int begin = GetTickCount();
int R,G,B,Y,U,V;
int x,y;
int nWidth = width>>1; //色度信号宽度
for (y=0;y<height;y++)
{
for (x=0;x<width;x++)
{
   Y = *(yuv420[0] + y*width + x);
   U = *(yuv420[1] + ((y>>1)*nWidth) + (x>>1));
   V = *(yuv420[2] + ((y>>1)*nWidth) + (x>>1));
   R = Y + 1.402*(V-128);
   G = Y - 0.34414*(U-128) - 0.71414*(V-128);
   B = Y + 1.772*(U-128);

   //防止越界
   if (R>255)R=255;
   if (R<0)R=0;
   if (G>255)G=255;
   if (G<0)G=0;
   if (B>255)B=255;
   if (B<0)B=0;

   *(rgb24 + ((height-y-1)*width + x)*3) = B;
   *(rgb24 + ((height-y-1)*width + x)*3 + 1) = G;
   *(rgb24 + ((height-y-1)*width + x)*3 + 2) = R;
//    *(rgb24 + (y*width + x)*3) = B;
//    *(rgb24 + (y*width + x)*3 + 1) = G;
//    *(rgb24 + (y*width + x)*3 + 2) = R;
}
}
}