message: Aravis: support Bayer GR 8 raw format.
diff: // video/x-raw, fourcc:'Y800' -> 8bit, 1 channel
  // video/x-raw, fourcc:'Y12 ' -> 12bit, 1 channel
  // video/x-raw, fourcc:'Y16 ' -> 16bit, 1 channel
  +// video/x-raw, fourcc:'GRBG' -> 8bit, 1 channel
  //
  #define MODE_GREY CV_FOURCC_MACRO('G','R','E','Y')
  #define MODE_Y800 CV_FOURCC_MACRO('Y','8','0','0')
  #define MODE_Y12 CV_FOURCC_MACRO('Y','1','2',' ')
  #define MODE_Y16 CV_FOURCC_MACRO('Y','1','6',' ')
  +#define MODE_GRBG CV_FOURCC_MACRO('G','R','B','G')
  #define CLIP(a,b,c) (cv::max(cv::min((a),(c)),(b)))
  @@ -315,6 +317,7 @@ IplImage* CvCaptureCAM_Aravis::retrieveFrame(int)
  int depth = 0, channels = 0;
  switch(pixelFormat) {
  case ARV_PIXEL_FORMAT_MONO_8:
  + case ARV_PIXEL_FORMAT_BAYER_GR_8:
  depth = IPL_DEPTH_8U;
  channels = 1;
  break;
  @@ -475,6 +478,8 @@ double CvCaptureCAM_Aravis::getProperty( int property_id ) const
  return MODE_Y12;
  case ARV_PIXEL_FORMAT_MONO_16:
  return MODE_Y16;
  + case ARV_PIXEL_FORMAT_BAYER_GR_8:
  + return MODE_GRBG;
  }
  }
  break;
  @@ -547,6 +552,10 @@ bool CvCaptureCAM_Aravis::setProperty( int property_id, double value )
  newFormat = ARV_PIXEL_FORMAT_MONO_16;
  targetGrey = 32768;
  break;
  + case MODE_GRBG:
  + newFormat = ARV_PIXEL_FORMAT_BAYER_GR_8;
  + targetGrey = 128;
  + break;
  }
  if(newFormat != pixelFormat) {
  stopCapture();
  