怎样将320*240的采集的图像转换为176*144方法-优快云博客

本文链接：https://blog.youkuaiyun.com/mingzhaoyu/article/details/135106748

文章详细描述了一个视频捕捉类的回调函数，处理YUY2和未压缩的RGB24格式数据，通过ConvDephi函数进行像素切割，并根据不同压缩格式发送到本地或远程显示。

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代码只是截取了功能实现部分，具体怎么应用需要根据自己的开发环境来实现。

LRESULT CALLBACK CVideoCapture::VideoStreamCallbackProc(HWND hWnd, LPVIDEOHDR lpVHdr)
{
unsigned char* RGBBuf;
unsigned char* RGBBufDis;
CVideoCapture* pCapture=(CVideoCapture*)capGetUserData(hWnd);
int Wi=pCapture->m_sBitMapInfo.bmiHeader.biWidth;
int Hi=pCapture->m_sBitMapInfo.bmiHeader.biHeight;

XL_VIDEO_MSG msg;
msg.flag=0;

if(pCapture && pCapture->m_bActive)
{
  CVideoCenter * pVideoCenter=CVideoCenter::getInstance();
  if ( 0x32595559 == pCapture->m_sBitMapInfo.bmiHeader.biCompression )
  {
   // YUY2
   RGBBuf= (unsigned char*)malloc(Hi*Wi*3); //320*240
   pCapture->YUY22RGB24(RGBBuf,lpVHdr->lpData);

   RGBBufDis= (unsigned char*)malloc(pCapture->m_nWi*pCapture->m_nHi*3);

// dephi 320x240 -> 176*144
pCapture->ConvDephi(RGBBuf,RGBBufDis,Wi,Hi);

   if(pVideoCenter->m_bVideoTransOpen)
   {
    pVideoCenter->m_pVideoTransmit->LocalDataDisplay(RGBBufDis,pCapture->m_nWi*pCapture->m_nHi*3);

//    pVideoCenter->m_pVideoTransmit->SendVideoToRemote(RGBBufDis,pCapture->m_nWi*pCapture->m_nHi*3);

    msg.length=Wi*Hi*3;
    memcpy(msg.buffer,RGBBufDis,msg.length);
    pVideoCenter->m_pMsgHandler->ReportEvent(&msg);

   }
   free(RGBBuf);
   free(RGBBufDis);
  }
  // uncompressed RGB24 (BGR sequence)
  else if ( 0 == pCapture->m_sBitMapInfo.bmiHeader.biCompression && 24 == pCapture->m_sBitMapInfo.bmiHeader.biBitCount)
  {
   // RGB
   RGBBufDis= (unsigned char*)malloc(pCapture->m_nWi*pCapture->m_nHi*3);
   pCapture->ConvDephi(lpVHdr->lpData,RGBBufDis,Wi,Hi);

// pVideoCenter->m_pVideoTransmit->LocalDataDisplay(lpVHdr->lpData,lpVHdr->dwBytesUsed);

   if(pVideoCenter->m_bVideoTransOpen)
   {
    pVideoCenter->m_pVideoTransmit->LocalDataDisplay(RGBBufDis,pCapture->m_nWi*pCapture->m_nHi*3);
//    pVideoCenter->m_pVideoTransmit->SendVideoToRemote(RGBBufDis,pCapture->m_nWi*pCapture->m_nHi*3);

    msg.length=Wi*Hi*3;
    memcpy(msg.buffer,RGBBufDis,msg.length);
    pVideoCenter->m_pMsgHandler->ReportEvent(&msg);

}
free(RGBBufDis);

}

}
return 111;
}

//这个是转换函数，主要算法就是将像素点进行切割。

void CVideoCapture::ConvDephi(unsigned char* source, unsigned char* dest,int srcWi,int srcHi)
{
int i;
int j;
int qWi=(srcWi-m_nWi)/2;
int qHi=(srcHi-m_nHi)/2;

for(i=0;i
{
  for(j=0;j
  {
            *(dest+i*m_nWi*3+j*3) = *(source+(qHi+i)*3*srcWi+(qWi+j)*3);
            *(dest+i*m_nWi*3+j*3+1) = *(source+(qHi+i)*3*srcWi+(qWi+j)*3+1);
            *(dest+i*m_nWi*3+j*3+2) = *(source+(qHi+i)*3*srcWi+(qWi+j)*3+2);
  }
}
return;
}