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YUYV转RGB

时间:2014-06-20 22:38:54      阅读:542      评论:0      收藏:0      [点我收藏+]

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  YUYV是YUV的一种一个像素占用两个字节,存放顺序为[Y0 U0][Y1 V0][Y2 U1][Y3 V1].....

  Y表示亮度,UV是色差信号奇数(在前)和偶数(在后)像素共用色差信号UV

  下面是用查表法转换YUYV(YUV422)为RGB32位的代码

int y_table[256];//查表法
int v_r_table[256];
int v_g_table[256];
int u_g_table[256];
int u_b_table[256];

unsigned int limit_table[256*3];


__forceinline unsigned int LimitToUnsigned8Bits(int value)
{
    if (value > 255)
        return 255;
    else if (value < 0)
        return 0;
    else
        return value;
}


void InitTable()
{
    for(int i=0;i<=255;i++)
    {
        y_table[i]=(i-16)*1192;
        v_r_table[i]=(i-128)*1634;
        v_g_table[i]=(i-128)*833;
        u_g_table[i]=(i-128)*401;
        u_b_table[i]=(i-128)*2065;
    }
    for (int i=0;i<256*3;i++)
    {
        limit_table[i]=LimitToUnsigned8Bits(i-256);
    }

}


__forceinline unsigned int ConvertYUVPixelToRGB(unsigned char yComponent,unsigned char uComponent,unsigned char vComponent)
{
//转换公式
/* B= 1.164*(Y-16) + 2.018*(U-128); 为了提高速度,放大后使用整数计算,同时移位10位相当于放大缩小1024倍 G= 1.164*(Y-16) - 0.380*(U-128) - 0.813*(V-128); R= 1.164*(Y-16) + 1.159*(V-128); */ //原版代码 //int y = yComponent - 16; //int u = uComponent - 128; //int v = vComponent - 128; //int r = LimitToUnsigned8Bits((1192 * y + 1634 * v) >> 10); //int g = LimitToUnsigned8Bits((1192 * y- 833 * v - 401 * u) >> 10); //int b = LimitToUnsigned8Bits((1192 * y + 2065 * u) >> 10); //return (255 << 24) | (r << 16) | (g << 8) | b; int y1192=y_table[yComponent]; int r = limit_table[((y1192 + v_r_table[vComponent]) >> 10)+256];//可能小于0,先取正 int g = limit_table[((y1192 - v_g_table[vComponent] - u_g_table[uComponent]) >> 10)+256]; int b = limit_table[((y1192 + u_b_table[uComponent]) >> 10)+256]; return (255 << 24) | (r << 16) | (g << 8) | b; } void ConvertBitmapFromYUYV(int width, int height, unsigned char *bufferIn,unsigned int *bufferOut) { for (int pixel = 0; pixel < width * height; pixel += 2) { unsigned char y1 = *bufferIn++; unsigned char u = *bufferIn++; unsigned char y2 = *bufferIn++; unsigned char v = *bufferIn++; //unsigned int a=ConvertYUVPixelToRGB(y1, u, v); *bufferOut++ = ConvertYUVPixelToRGB(y1, u, v); *bufferOut++ = ConvertYUVPixelToRGB(y2, u, v); } }

 

YUYV转RGB,布布扣,bubuko.com

YUYV转RGB

标签:style   class   blog   code   color   com   

原文地址:http://www.cnblogs.com/nkzhangkun/p/3795832.html

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