- Validate input arguments: for example some ints must be >= 0 - Add options to control the delay of when frames are added or removed from the trail - Some trivial cases of trails just need a framebuffer with no need to keep the history of frames, see if the code handling those cases can be optimized - Clean up the code? My C++ is a little C-ish... - Evaluate other background subtraction methods: https://github.com/opencv/opencv_contrib/blob/master/modules/bgsegm/samples/evaluation.py