CollectorVision Part 2: Cornelius — How the Corner Detector Finds Cards in the Wild

Part 2 of the CollectorVision series. Part 1 has the overview. Before you can identify a card you have to find it. Cornelius is the model responsible for that — it takes a camera frame and predicts where the four corners of the card are. This sounds easy. It's not. What the detector has to deal with Cards in a real scene come in a lot of shapes. They're held at angles, rotated, half-off-screen, in…