affine_trans_contour_xld — 2D contour op

• Data kinds: contour → contour

• Call: fullseye.apply(img, "affine_trans_contour_xld", a=0.5, b=0.5) (the 2-D model is one image plus two scalar knobs a,b∈[0,1])

• HALCON equivalent: affine_trans_contour_xld (the HALCON reference is a useful guide to its meaning and parameters)

Usage

Rotates each point of the contour about the image center (from -20° to +20°, determined by `a). HALCON's affine_trans_contour_xld` (Apply an arbitrary affine 2D transformation to XLD contours.) can take an arbitrary affine matrix (including translation, scaling, and shear), but this stand-in simplifies it to pure rotation only (an approximation).

> The detailed description below is the original text — the summary and the headings are translated.

`a が回転角を振る。b` は未使用。

Detailed usage guide

• gallery2d_contour_measure 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)

• gallery2d_contour_measure — py -3.11 examples/gallery2d_contour_measure.py

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

identity · select_contours · smooth_contours · fit_line_contours · contours_to_region · count_contours · total_length · select_contours_xld

Same category (contour)

select_contours · smooth_contours · fit_line_contours · contours_to_region · sk_find_contours · edges_sub_pix · lines_gauss · select_contours_xld

*Provenance: ops.py — 2D 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.