use 3 usb cameras with imaqdx

[McLovin]

hello everyone:

I need to use 3 usb cams with imaqdx .How should I do?

any Example ?

vs2008 C#

VASAugust2010

Thanks for all your help !

[cpan · Accepted solution]

Hi McLovin,

Firstly, you need to check whether your USB cams are DirectShow compatible with IMAQdx. If yes, then you might refer to the attached VI example of using 2 cams and extend it to 3 cams similarily.

Best Regards,

cpan

[McLovin]

Hello cpan:

Thanks very much for your reply.

But I used vs2008 C# for program with imaqdx,So I wish you have some Example under C#.Thank you very much.

[cpan]

Hi McLovin,

Even LabVIEW and C# are different programming languages, in terms of programming, the main ideas are pretty similar: use different sessions to access different cameras, with proper allocation of image, then snap images from different cameras based on their corresponding session tokens.

 try
 {
  //-----------------------------------------------------------------------
  //  Open a session to the camera
  //-----------------------------------------------------------------------
  IMAQdxError status = IMAQdxOpenCamera (camName, IMAQdxCameraControlModeController, &session);
  if (status)
   throw status;
  
  //--------------------------------------------------------------------
  //  We need an image for display purposes. 
  //--------------------------------------------------------------------
  image = imaqCreateImage (IMAQ_IMAGE_U8, 0);
  if (!image)
   throw VisionError();

  //-----------------------------------------------------------------------
  //  Now it's time to snap and display an image. 
  //-----------------------------------------------------------------------
  status = IMAQdxSnap (session, image);
  if (status)
   throw status;

  //-----------------------------------------------------------------------
  //  Display the image
  //-----------------------------------------------------------------------
  imaqDisplayImage(image, 0, true);
 }

Hope that could be helpful to you...

Best Regards,

cpan

[McLovin]

Thank you very much.