YUYV转RGB888，RGB565

lcd1602xuexi 2013-09-10 08:20:09

我想用ARM9的板子采集摄像头输出（YUYV格式）的视频，并在LCD（显示格式RGB565）上显示，我下了一个程序，能够实现RGB888显示，为了能在LCD上显示，我把RGB888转换为RGB565，转换函数为：



unsigned short ProcessImage::RGB888toRGB565(uchar red, uchar green, uchar blue)

{

        unsigned short B = (blue >> 3) & 0x001F;

        unsigned short G = ((green >> 2) << 5) & 0x07E0;

        unsigned short R = ((red >> 3) << 11) & 0xF800;



        return (unsigned short) (R | G | B);

}



该函数是YUYV转换为RGB888格式   int ProcessImage::convert_yuv_to_rgb_pixel(int y, int u, int v)

验证成功的



下面是我修改的，

for(in = 0; in < width * height * 2; in += 4) 

{

  pixel_16 =

   yuv[in + 3] << 24 |

   yuv[in + 2] << 16 |

   yuv[in + 1] <<  8 |

   yuv[in + 0];

  y0 = (pixel_16 & 0x000000ff);

  u  = (pixel_16 & 0x0000ff00) >>  8;

  y1 = (pixel_16 & 0x00ff0000) >> 16;

  v  = (pixel_16 & 0xff000000) >> 24;

  pixel32 = convert_yuv_to_rgb_pixel(y0, u, v);

  pixel_24[0] = (pixel32 & 0x000000ff);

  pixel_24[1] = (pixel32 & 0x0000ff00) >> 8;

  pixel_24[2] = (pixel32 & 0x00ff0000) >> 16;

 // rgb[out++] = pixel_24[0];  这是原来例程中的函数，提取R,G,B分量

  //rgb[out++] = pixel_24[1];

 // rgb[out++] = pixel_24[2];

  travel=RGB888toRGB565(pixel_24[2],pixel_24[1], pixel_24[0]);

memcpy((void *)rgb,(void *)&travel,2);

 // rgb[out++]=travel & 0xff;

//rgb[out++]=(travel>>8)& 0xff;

  pixel32 = convert_yuv_to_rgb_pixel(y1, u, v);  

  pixel_24[0] = (pixel32 & 0x000000ff);

  pixel_24[1] = (pixel32 & 0x0000ff00) >> 8;

  pixel_24[2] = (pixel32 & 0x00ff0000) >> 16;

 // rgb[out++] = pixel_24[0];

  //rgb[out++] = pixel_24[1];

  //rgb[out++] = pixel_24[2];

  travel=RGB888toRGB565(pixel_24[2],pixel_24[1], pixel_24[0]); //我修改的，RGB888转RGB565

rgb+=2;

memcpy((void *)rgb,(void *)&travel,2);

 // rgb[out++]=travel & 0xff;

//rgb[out++]=(travel>>8)& 0xff;



 }

就是RGB888toRGB565 函数得到RGB565数据，然后拷贝给输出，送QT画图显示，可为什么不对呢？



convert_yuv_to_rgb_buffer(p,pp,320,240/*QWidget::width(),QWidget::height()*/);

    frame->loadFromData((uchar *)pp,/*len*/320 *240 * 2 * sizeof(char));



........

painter = new QPainter(this);

 frame = new QImage(pp,320,240,QImage::Format_RGB16);

有没有搞过类似开发的高手帮忙指点下？我想学学这块，求指点

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