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Published on Mar 16, 2013
Demonstration of quick and dirty tennis ball tracking, used to provide external physical input to HTape - a 3D audio processing engine. For example, you could attach a "birdie tweet" to the tennis ball, then physically move the sound source around to hear it simulated in 3D. If you attached a whisper, you might bring the ball up to your ear to hear it more clearly.
Opted against hough circles as I found the technique to be very unstable.
1. Isolate ball via HSV thresholding 2. Dilate / Erode to eliminate false positives 3. Find cvContours of thresholded image 4. Find bounding box of contours