Author: drew

The NUbots goal detection code uses something called RANSAC.  I wonder if they have tried their algorithm on a white background yet…  It wouldn’t seems so since they are still using a LUT which I don’t think will work with white on white.  Of course this might be their old code from last year.

So, I just had to play around with the colors of the picture that Canny couldn’t detect (and still can’t) but now there is a distinct green color for the white “goal post”!  That could then be id’ed by blob detection which we have now.   However, how to do this programmatically is beyond me!… Continue reading Breaking Countershading

So, I grabbed some images from robocup 2014 that we took of the goal with the netting.  One has no people behind it and the other had people behind it.  I ran both Canny and Hough on it to see if the netting would stand out. Canny with people behind the net: Canny with no… Continue reading Goal net

As you probably can’t see is the fact that I have placed a white pvc pipe in an orange vice grip and put in front of a white background.  I tried running the image through opencv’s HoughLinesP (image below) and Canny and neither can extract the pipe.  However, I’m not surprised as when I zoom… Continue reading White Goal Post Experiment

I think that I might want to try out Canny’s edge detection algorithm to identify the goal posts on the negative of the flood filled image (meaning remove the grass and ball).  I think the main problem will be determining which lines are the goal posts.  Mainly because the robots don’t always see the entire… Continue reading Canny Edge Detection