pub fn pooled_modal_ground(images: &[CaptureImage]) -> [u8; 4]Expand description
modal_ground over one histogram summed across every image — one
ground for a whole series, from the same band mean and the same
MIN_GROUND_SHARE rule.
For a caller that must hold one reference across many frames (the shot
horizon, whose ruler may not move between rows) and cannot trust any single
frame to carry it: a cellular world’s first frame is a seed soup near a 50 %
tie, and pooling lets the settled frames outvote it. Every pixel weighs the
same, so images of different sizes pool by pixel count, not per image.
modal_ground is this over a one-image slice, so the two cannot drift. An
empty slice has no pixels and returns NO_GROUND.