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M6: detect a row of comb boxes as one comb text field (#2111)

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* M6: detect a row of comb boxes as one comb text field (fixes #1887)

* M6: keep empty tables of wide cells out of comb detection (#1887)

---------

Co-authored-by: Brandon Thomas <echelon@gmail.com>
This commit is contained in:
Marco Arnulfo
2026-10-18 03:50:00 -04:00
committed by GitHub
co-authored by Brandon Thomas
parent eeadc79d15
commit 50f261d70c
8 changed files with 194 additions and 23 deletions
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parity/acrobat-features.toml
+2 -2
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@@ -5088,8 +5088,8 @@ milestone = "M6"
status = "partial"
commands = ["form.detect", "form.prepare"]
tools = ["form_detect_fields"]
evidence = ["crates/forms/src/tests.rs::detection_finds_blanks_rules_boxes_and_names_them", "crates/forms/src/tests.rs::page_shapes_reads_rectangles_with_points_along_their_sides", "crates/engine/src/tests.rs::detecting_fields_on_a_printed_form", "crates/engine/src/tests.rs::detecting_fields_on_a_scanned_form", "crates/forms/src/detect/raster.rs::a_scanned_form_gives_its_rules_boxes_and_check_boxes", "crates/forms/src/detect/raster.rs::noise_and_uneven_paper_do_not_hide_the_lines", "crates/automation/tests/automation.rs::detecting_form_fields_through_tools", "crates/ui-egui/tests/javascript.rs::prepare_a_form_detects_fields_on_a_paper_form", "crates/ui-egui/tests/prepare.rs::deleting_several_selected_fields_and_detecting_fields_from_the_panel"]
notes = "Underscore runs, rules, empty boxes and small squares (check boxes); a box drawn with points along its sides (a midpoint on each vertical side, as the French 2042 form's cells) is read as the rectangle it is (#2942); runs when Prepare a form starts on a document without fields, and from Prepare a form ▸ Detect form fields at any time (existing fields are skipped). Scanned pages (an image covers at least half the page and the content draws no lines) are rendered and their rules, boxes and check boxes read from the pixels; a box with a small printed label gets a field in its empty part. Tested on synthetic scans only: straight, stored sideways with /Rotate 90 (fields get /MK /R so typing reads upright), noisy, and 1 degree askew (fields stay inside their boxes but lose up to the skew in height). Labels come from the text layer or, when the OCR models are installed, from text recognition (Latin without accents, so German labels with umlauts make poorer names); without either, fields get default names (Text1, Check Box1). Recognition runs synchronously, about a second per scanned page. Not yet: comb boxes, dotted leader lines, tables of cells as such, deskewing, radio groups."
evidence = ["crates/forms/src/tests.rs::detection_finds_blanks_rules_boxes_and_names_them", "crates/forms/src/tests.rs::page_shapes_reads_rectangles_with_points_along_their_sides", "crates/engine/src/tests.rs::detecting_fields_on_a_printed_form", "crates/forms/src/tests.rs::detection_makes_a_row_of_touching_cells_one_comb_field", "crates/engine/src/tests.rs::detecting_comb_boxes_adds_one_comb_field_per_row", "crates/engine/src/tests.rs::detecting_fields_on_a_scanned_form", "crates/forms/src/detect/raster.rs::a_scanned_form_gives_its_rules_boxes_and_check_boxes", "crates/forms/src/detect/raster.rs::noise_and_uneven_paper_do_not_hide_the_lines", "crates/automation/tests/automation.rs::detecting_form_fields_through_tools", "crates/automation/tests/automation.rs::detecting_comb_boxes_through_tools", "crates/ui-egui/tests/javascript.rs::prepare_a_form_detects_fields_on_a_paper_form", "crates/ui-egui/tests/prepare.rs::deleting_several_selected_fields_and_detecting_fields_from_the_panel"]
notes = "Underscore runs, rules, empty boxes, small squares (check boxes) and rows of two or more touching cells of one size (one comb text field, character limit = cells; tested on drawn forms only); a box drawn with points along its sides (a midpoint on each vertical side, as the French 2042 form's cells) is read as the rectangle it is (#2942); runs when Prepare a form starts on a document without fields, and from Prepare a form ▸ Detect form fields at any time (existing fields are skipped). Scanned pages (an image covers at least half the page and the content draws no lines) are rendered and their rules, boxes and check boxes read from the pixels; a box with a small printed label gets a field in its empty part. Tested on synthetic scans only: straight, stored sideways with /Rotate 90 (fields get /MK /R so typing reads upright), noisy, and 1 degree askew (fields stay inside their boxes but lose up to the skew in height). Labels come from the text layer or, when the OCR models are installed, from text recognition (Latin without accents, so German labels with umlauts make poorer names); without either, fields get default names (Text1, Check Box1). Recognition runs synchronously, about a second per scanned page. Not yet: dotted leader lines, tables of cells as such, deskewing, radio groups."
[[feature]]
id = "form.auto-name-fields"