Image acquisition with USB Webcams

[Team_vision]

Hello,

We are currently trying to acquire images with a webcam (logitech quickcam) using the soft « NI-IMAQ for USB Cameras ». We are trying to use the VI examples Grab an Snap supplied with the software but those programs generate an error « system memory error ». So, the error occurs by the initialization, it’s the « IMAQ USB Init » VI which generates it.

Does someone have the same problem? Does someone have a solution?
Thanks for tips and ideas.

Regards

[pierrot34]

Hello !

I have exactly the same problem.
My configuration is : LabView7.0 / Vision7.1 / XP SP2 / DirectX9.0c / QuickCam Pro 3000

Note that we also have the following message error : Filter name not found (depending if we run the program for the first time or not...)
The webcam is recognized on the acquisition window of "vision assistant", but when I choose it, I have the following message : "the setting for this camera is not valide"

Thank you for your help.

P.

[SanaaT]

Hello All,

Be careful because the NI-IMAQ for USB Camera driver supports any camera with a Direct Show filter.
Are you sure that your camera has a Direct Show filter?

Please see the link below to have more information about this driver :
http://digital.ni.com/public.nsf/websearch/89E33B77CFE244E986256F8E004E0F13?OpenDocument
http://digital.ni.com/public.nsf/websearch/274A74A901399D0486256F32007295F9?OpenDocument

Regards,

Sanaa T
National Instruments France

[pierrot34]

Hello !

It seems that my webcam(s) are Direct Show compatible :
The VI "IMAQ USB Enumerate camera" is working fine !
So the call to the function "LV_imgDShowGetVideoCapFilters" in the dll "ImaqDirectShowDll" works !

but then, in the next step of my VI, when I reach the sub-VI "IMAQ USB Init" it doesn't work any more. I don't understand, because this VI calls the same dll (ImaqDirectShowDll)...

Thank you for your help...

Pierre

[alipio]

Hi
I tried logitech quickcam 400 pro and messenger and the work fine
If it helps, I am using XP pro SP1, DirectX9 last version, Labview 7.1 and vision 7.1.
Webcam works fine with vision and vision assistant.

Alipio