Acquiring from a Live Display

Cognex VisionPro 9.25 SR1

The same ICogAcqFifo object can be used to acquire an image while simultaneously displaying live video from the same camera. Use the StartLiveDisplay method to start a live display in a CogDisplay control, and the Acquire method to acquire images. See the topic Acquiring Images with a CCD Camera and Frame Grabber for more information on acquiring images.

The following C# statements are taken from a .NET Windows application with a Windows form containing two CogDisplay controls and three buttons:

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private int tNum;
private CogFrameGrabbers myFrameGrabbers;
private ICogAcqFifo myFifo;

private void InitializeFifo()
{
        myFrameGrabbers = new CogFrameGrabbers();
        myFifo = myFrameGrabbers[0].CreateAcqFifo("Sony XC75 640x480",
                Cognex.VisionPro.CogAcqFifoPixelFormatConstants.Format8Grey, 0, false);
}

private void button1_Click(object sender, System.EventArgs e)
{
        cogDisplay1.StartLiveDisplay(myFifo, false);
}

private void button2_Click(object sender, System.EventArgs e)
{
        cogDisplay2.Image = myFifo.Acquire(out tNum);                
}

private void button3_Click(object sender, System.EventArgs e)
{
        cogDisplay1.StopLiveDisplay();
}

private int tNum;
private CogFrameGrabbers myFrameGrabbers;
private ICogAcqFifo myFifo;

private void InitializeFifo()
{
        myFrameGrabbers = new CogFrameGrabbers();
        myFifo = myFrameGrabbers[0].CreateAcqFifo("Sony XC75 640x480",
                Cognex.VisionPro.CogAcqFifoPixelFormatConstants.Format8Grey, 0, false);
}

private void button1_Click(object sender, System.EventArgs e)
{
        cogDisplay1.StartLiveDisplay(myFifo, false);
}

private void button2_Click(object sender, System.EventArgs e)
{
        cogDisplay2.Image = myFifo.Acquire(out tNum);                
}

private void button3_Click(object sender, System.EventArgs e)
{
        cogDisplay1.StopLiveDisplay();
}