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fix(tables): recognize chart-bar clusters and mask their text from table detection (#159)

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Bar charts drawn as filled rects read as cell rects or aligned text:
the cell-rect fallback gridded their axis labels into phantom tables,
and when rect paths rejected them, hint regions and the gap-histogram
heuristic re-gridded the same text. On survey-report pages this
scrambled reading order and swallowed section headings.

Detection (is_chart_bar_cluster): the dominant equal-breadth rect
family arranged in >=2 spaced positions (bars; cell rects touch),
data-driven extent variation (>=1.3x), no same-offset/same-extent
partners across positions (grid rows pair up, chart segments don't),
and only numeric labels inside. Mirrored predicate covers horizontal
bar charts.

Chart clusters are skipped in detect_tables_from_rects (no table, no
hint), and a new detect_chart_regions pass lets the markdown pipeline
pre-claim chart items so heuristic/line/column detection and the
merged-band retry all skip them — the text flows out as plain lines.

opendataloader-bench: overall 0.8389 -> 0.8446, TEDS 0.699 -> 0.708,
MHS 0.742 -> 0.750, NID 0.889 -> 0.894; 7 docs up (best +0.459), none
down. pdf-evals changed-set composite +0.013, TEDS +0.036.

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Abimael Martell
2026-07-15 00:06:17 -07:00
committed by GitHub
co-authored by Claude Fable 5
parent e48e34dfe9
commit 2ed152e49b
3 changed files with 341 additions and 13 deletions
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src/tables/mod.rs
+1 -1
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@@ -15,7 +15,7 @@ pub use detect_heuristic::detect_tables;
pub(crate) use detect_heuristic::is_table_of_contents;
pub use detect_lines::detect_tables_from_lines;
pub(crate) use detect_rects::cluster_rects;
pub use detect_rects::{detect_tables_from_rects, RectHintRegion};
pub use detect_rects::{detect_chart_regions, detect_tables_from_rects, RectHintRegion};
pub use detect_struct::detect_tables_from_struct_tree;
pub use format::table_to_markdown;
pub use structured::{cells_to_markdown, StructuredCell};