corridor_threshold_detection

Functions

area_count(gray, rect, threshold, black)	Replicates per-area pixel count (camera.py detect_black/white).
scan_video(path, rects, thresholds, empty, black)	Scans a video, keeping only the best BGR frame per area.
select_from_grays(grays, rects, thresholds, ...)	For each area, pick the gray-frame index where only that area is occupied.