profile_chord_frame — PROFILE frame op

• Data kinds: pairs → table

• Call: import fullseye as fs; fs.ledger.profile_chord_frame(contour) (to call the implementation directly, import profileops; profileops.profile_chord_frame(contour); from the registry, opsprofile.get("profile_chord_frame"))

Usage

Finds the chord (the 2 points farthest apart). Returns a dict.

Following airfoil convention, the 2 points farthest apart are taken as leading and trailing edge. Which one is the leading edge is decided by whichever has the larger curvature in the neighbourhood of that point (the leading edge is round, the trailing edge sharp).

Returns:

dict: le / te (coordinates), le_index / te_index,

chord (length), angle_deg (direction of the chord).

Detailed usage guide

• profile_metrology family guide

References (sample data, literature)

• Sample-data catalog (download URLs / licences) — 2-D uses skimage.data (BSD/public domain) plus synthetic images; 3-D lists download URLs for real data sources (Stanford, PDS, …).

• Operator provenance and references — the sources of the research/methods this op family came from.

• The canonical algorithm (author, year) and its uses are named in the family usage guide above.

Runnable examples (verified samples that actually call this op)

• profile_frame_tour — py -3.11 examples/profile_frame_tour.py

• profile_shape_inspection — py -3.11 examples/profile_shape_inspection.py

Ops the type connects to (they accept table as input)

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Same category (frame)

profile_normalise · profile_resample

*Provenance: profileops.py — PROFILE operator registry. This per-op note is generated by tools/opdocs.py md (do not hand-edit).*

© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.