public void UpdateLeft()
{
if (!camStatus)
return;
BitmapData dataLeft = imageDataLeft.LockBits(new Rectangle(0, 0, imageSizeW, imageSizeH),
ImageLockMode.WriteOnly, PixelFormat.Format24bppRgb);
//get image data
ovGetCamImageBGR(dataLeft.Scan0, OV_CAMEYE_LEFT);
imageDataLeft.UnlockBits(dataLeft);
}