Cross-check + reuse-as-seg are already the config/CLI default; align the HTTP
service with them instead of forcing cross-check off. The earlier off-by-default
was to avoid the extra inference, but reuse-as-seg now makes that forward double
as the seg mask (birefnet backend) -- it replaces the primary seg model rather
than adding to it, so the cost concern is gone.
- app.py: honour the config default (on); BGFILTER_CROSS_CHECK still forces
either way, unset = config.
- service.py preload: warm the cross-check HR-matting model, and skip the now-
redundant primary segmenter when reuse covers segmentation.
- README / DEPLOY(_ZH): document cross-check as default-on, BiRefNet_HR-matting
as required (not optional), BGFILTER_CROSS_CHECK=0 to disable.
Verified: service defaults cross_check on, env forces both ways, preload picks
cross-checker and skips the primary segmenter.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
lhk229
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