Exposure / White - Black Voltage settings on PCI-1410 Frame grabber

[Jomile]

Hello,

I am using a PCI-1410 frame grabber and have written the acquisition software in Visual Basic .NET.

In measurment studio there is a button that automatically sets the white and black voltages based on the input voltages to the channel.

I want to impliment this in my VB.NET code.  I am aware of the "CWIMAQ.BlackReferenceVolt " and  "CWIMAQ.WhiteReferenceVolt" properities BUT is there something that will auto set the voltages?  I am asking because i have fond no function that will probe to find what the highest and lowest voltage is which is nessasary to dynamically set the voltages.

Thanks

Jonathan

[Michelle_N]

Hi Jonathan,

I do not see any built in functions for this but you can write a small algorithm to do this. Follow this link: Auto Exposure -take a look at Page 1, Mathieu Steiner's post.

[Jomile]

Hi Michelle,

Thanks for the info. I am having a problem using the histogram command.

I wrote a simple function that is excuted on Button2 click but the code program crashes when i get to the final line.  Is there something I am missing? 

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Dim CWIMAQVision3 As New NationalInstruments.CWIMAQControls.CWIMAQVision
        Dim HistogramReport As New NationalInstruments.CWIMAQControls.CWIMAQHistogramReport
        CWIMAQVision3.Histogram2(AxCWIMAQViewer3.Image, HistogramReport)

Thanks again

[Jomile]

 The error is as follows

Catastrophic failure (Exception from HRESULT: 0x8000FFFF (E_UNEXPECTED))

[Michelle_N]

It seems that you are working with another Applications Engineer regarding this issue via email?

[Jomile]

I sent an email but have not yet recieved a response.

I think the problem has to do with how I am difining the CWIMAQVision.

Is there supposed to be a CWIMAQVision in the tool box as there is a CWIMAQ and CWIMAQViewer?  Because in the example code I see, CWIMAQViewer is not difined as i do.

Thanks

Jonathan

[Jomile · Accepted solution]

Through forum searching.  If found the solution below to create the IMAQVision control.  Im assuming the reason that it was not available is because I do not have the vision license installed

        Dim IMAQVision As New NationalInstruments.CWIMAQControls.AxCWIMAQVision
        IMAQVision.CreateControl()