using Matterport Mask R-CNN balloon sample and bits of code from shapes sample to try to achieve transfer learning on tennis match video frames to track a ball.
If using VGG Annotator, be sure to use version 1 as version 2 is incompatible with Matterport out-of-box.
ipynb notebook with name ending in perimeter uses skimage.draw.circle_perimeter vs. other one uses just skimage.draw.circle