what is the better position to record video before analyze with labview and vision??

[wuliao23]

i wish to record a video and analyze it with labview and vision. The purpose of analyzing is to learn the edge detection. What is the better position to record the video so can reduce the error occurs during analyze. I wish to get the video of the motion of the cars on the road. Is that recording the video look from flyover better or beside the road is better?? thanks

[MacleanG]

Thanks for posting on the NI forums!  I think that images from above would be far easier to deal with, because you can set your ROI to be one lane, and watch for cars one at a time.  If you filmed from the side of the road, you could get two cars passing at once, or cars passing in opposite directions.  There would be a lot more interference filming from the side, and it would require a far more advanced algorithm to get data from the images.  From above, you can watch for cars against the road, which should be a relatively easy edge to detect.

Good luck!

[wuliao23]

thanks for the guidance. I try to set my ROI to be one lane.