mARTin-B78
b458306ab9
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Real failures found by re-inspecting a fresh re-ingest of c't KI Wissen
2026 after the previous figure-boundary-snapping release: a bar chart
was still truncated to roughly a third of its real height, and a
chart's top edge cut into an unrelated paragraph above it.
Root causes, each independently confirmed against the real page render
before fixing:
- A bar chart's bars/gridlines/axis labels rarely reach the "solid
ink" density a photo does (measured 0.25-0.5 vs the 0.55 threshold),
so the existing pass anchored only on the one fully-solid element
(the zero-line) and never grew further. Added a second, looser pass
that grows an anchor -- or the seed itself -- through any real mark
at all, fenced by the same blocked cells.
- Anchor selection ("which solid component does the seed overlap
most") was seed-size-dependent: a small seed touching only the
zero-line anchored there, but re-running the SAME function on the
box it had just produced -- now large enough to also touch a dense
axis-label strip -- picked that instead and shrank an already-good
box back down. Fixed by dilating the solid mask and labelling once,
BEFORE any seed is considered, so which components count as one
figure is a property of the page alone.
- A merged bounding box can enclose real text sitting between two
components even though neither component's own cells touched it (a
rectangle union, not the components' actual shape). Added
_trim_blocked_edges() to pull each edge back to the nearest text
wall found searching outward from the box's own centre.
- Two adjacent figures fencing each other's growth made each one's
result depend on the other's CURRENT box -- for two dark photos
sharing a caption strip, this never settled, swinging by over 100pt
call after call. snap_visual_bboxes() now re-seeds every visual on a
page from every other's last result for a bounded number of rounds,
deciding same-graphic ambiguity once up front (fenced against the
original seeds, before any iteration) so two disputed seeds can't
mutually fence each other into a tidy-looking split instead of being
recognised as the same disputed claim.
- A result is now only accepted once it reproduces itself when fed
back through the same rules (IoU-checked), and the minimum
seed/graphic overlap for repositioning a badly-offset box was
lowered slightly -- it was narrowly rejecting some real cases.
Verified against the full 204-page/147-figure document: idempotency
holds except for one confirmed non-convergent pair, which now lands on
the same deterministic answer every run instead of continuing to
drift.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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