Match pattern - effectiveness of the descriptor of KING
In my application, I am followed by objects in an image using the VI 'IMAQ Match model 4' from the Module of vision. Currently, follow-up can not keep up with the rate of acquisition of 60 Hz the camera so I would speed it up.
My first step was to define a descriptor of KING to find objects only in part (user-defined) image, which reduces the time to follow-up in a frame of 30 ms to 20 ms.
However, if I instead reduce the size of the image by:
- defining a return on investment directly in the camera that it returns only the interesting part of the image
- or by 'manually' copy the KING of the big picture into a smaller temporary in LabView
follow-up time reduced to ~ 7 ms.
I was very surprised to see, especially the second stage of cropping the image in LabView and track on the small image is faster than the built-in KING descriptor of the VI «IMAQ Match Pattern 4»
If Miss me an option or a setting here? Or y at - it an explanation of why I not see this behavior?
OK what I think is that
you use the KING for camera in this case that you force ccd to work just to the related KING
This means resulted in images are small between the start and inside the loop
It's a mechanical action (or it is better to say that the physical action)
but in a second you will get full size and makes the smaller image is the piece of your treatment consuming your CPU
Indeed in the first method, you do not have the image Corp. you just configured camera to make the picture smaller
but in a second you make image Cup and it is part of your treatment in your PC requires a CPU involving
Tags: NI Hardware
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Please check the attached capture
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