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How to capture image from USB camera in Labview 2010
wklove
Member
05-09-2011 10:44 AM
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Hey all,
I am very new to Labview but am working on a project that requires me to use a sensor to send a signal to Labview to capture an image from a USB camera and save. Then apply some image processing to do some geometric calculations. The calculation will be based on pixels so I guess the image needs to be in bitmap form. Right now I am just trying to start with the image acquisition part and was wondering if this can be done in Labview 2010. I have the vision toolbox and NXT Robotics. Are there any examples on this website that will help and do I have te proper tools to do this? Once I get the image capture/grab to work using labview, then I could work getting a sensor signal to trigger that capture and finally the processing side.
Like I said, I am very new to this so I am not sure if I need to download any particular drivers or vi's that I am missing or what those might be. Can someone provide some insight, links, or any help would be appreciated.
Thanks in advance for any help/suggestions.
Joe D.
NI Employee (retired)
05-10-2011 03:38 PM
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Hi wklove,
In order to do vision with LabVIEW you need to to have the Vision development module and have NI Vision Acquisition Software (VAS) installed. It sounds like you are missing VAS you can download it here. Once you have this installed you should be able to see your camera in Measurement and Automation (MAX). After you are able to see the camera, take a look at the NI Example Finder by going to Help » Find Examples
Joe Daily
National Instruments
Applications Engineer
may the G be with you ....
National Instruments
Applications Engineer
may the G be with you ....
ivymerci
Member
07-13-2011 07:25 PM
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Hi Joe. I am using avicap32 and clipboard to do the image capture. The clipboard seems to have a bad reliablity(sometimes I just got empty image array). Could youplease give me some suggestions about that? Another question, is VAS free?
Thank you and have a nice day!
Kevin_H.
NI Employee (retired)
07-14-2011 12:37 PM
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VAS is free if you're using the IMAQ drivers. The IMAQdx drivers (which interface with third party USB cameras) cost money. The clipboard IS notoriously unreliable in these cases. If you're fixed on not using our vision stuff you should use actual files as intermediaries (not the clipboard) if possible. Otherwise all you can do is put appropriate delays in (meaning long delays) and good error checking.
