Hot, Cold, Warm, and Cool Pixels in Event-Driven Cameras

Australian National University paper "Event Camera Calibration of Per-pixel Biased Contrast Threshold" by Ziwei Wang, Yonhon Ng, Pieter van Goor, and Robert Mahony discusses pixel mismatch issues in event-driven cameras:

• Hot Pixels are pixels that have lower threshold values than the assumed value. This means that both positive and negative events are generated more often than expected.
• Cold Pixels are pixels that have higher threshold values than the assumed value. This means that both positive and negative events are generated less often than expected.
• Warm Pixels are pixels that have negative bias values. This means positive events are triggered more often, and negative events are triggered less often than expected.
• Cool Pixels are pixels that have positive bias values. This means negative events are triggered more often, and positive events are triggered less often than expected.