affine_trans_polygon_xld — 2D `contour` op

• Data kinds: contour → contour

• Call: fullseye.apply(img, "affine_trans_polygon_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_polygon_xld (the HALCON reference is a useful guide to its meaning and parameters)

affine_trans_polygon_xld: 入力 → 出力

*The figure is the real output on a synthetic 128×128 input. Left: input, right: output (a non-image return value is shown as the value itself).*

Usage

Applies an affine rotation to an XLD contour (a polygon/curve's vertex sequence). Rotates it about the image center by angle `-20°+40a` (no shear or translation, rotation-only, a partial affine). b is unused.

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

HALCON の `affine_trans_polygon_xld`（XLD 多角形に任意のアフィン 2D 変換を適用する演算）とは異なり、この実装は回転成分だけを再現する近似で、拡大縮小やせん断は反映されない。

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.

Try it in Studio

The program below has been verified to run (same input as the figure). In Studio's help this block becomes buttons that load and run it on the spot.

threshold 0.50 0.50
sk_find_contours 0.50 0.50
affine_trans_polygon_xld 0.50 0.50

▸ Load this pipeline · Load & run

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).*

affine_trans_polygon_xld — 2D contour op