USB camera information

[tcheng7992]

How to use IMAQ USB to show the frame rate of the camera ?

There is no buffer number out information.

I am using the imaqusb.llb.

Thanks !

Joe

[Joel Khan]

NI-IMAQ USB is a discontinued driver for USB cameras. IMAQdx from NI Vision Aquisition software package is what you should be using for new projects. I am not familiar with the imaqusb available functions; I would expect there would be some function similar to the IMAQdx grab.vi which will have buffer number out information. If there is no function or property node which allows you to read this information there is likely no easy way to read the FPS with the old IMAQ USB driver.

I would check the NI USB IMAQ driver examples to see if they have coded anything which displays and computes frame rate. You can find these examples using the directions in the link below.

http://digital.ni.com/public.nsf/allkb/FE15D94549DA4E59862575C200668759?OpenDocument

<Joel Khan | Applications Engineering | National Instruments | Rice University BSEE> 

[tcheng7992]

Thank you, Joel.

I have installed NI Vision Aquisition software (August 2010 version) in my computer.

However, there is no "imaqUSB examples.llb" in C:\Program Files\National Instruments\labview\examples\IMAQ directory.

Please advise.

Joe

[Joel Khan]

Joe,

The IMAQ USB examples are for the old IMAQ USB driver. If you are going to use the IMAQdx driver you will be utilizing a different set of functions. These are IMAQdx functions, they work with USB, FIrewire, and GIGe cameras. These examples can be found using the example finder: Hardware Input and Output>> IMAQdx>> High Level; I would look at the Grab.vi first.