affine_warp — 2D geometry op

• Data kinds: image → image

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

Usage

Applies an arbitrary affine transformation (rotation + shear) to an image. Equivalent to HALCON's `affine_trans_image` (Apply an arbitrary affine 2D transformation to images.).

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

`a が回転角を -20°〜+20° に、b がせん断量を -0.2〜+0.2 に振る。回転中心は画像の中心、境界は reflect（鏡映）で埋め、結果を [0,1] に clip する。平行移動・拡大縮小は含まない（_rescale_img/_rotate_img` が別 op として存在）。

Detailed usage guide

• gallery2d_geometry 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_geometry — py -3.11 examples/gallery2d_geometry.py

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

identity · gaussian · mean_box · bilateral · unsharp · median · min_filter · max_filter

Same category (geometry)

rotate_img · rescale_img · sk_swirl · mirror_image · transpose_region · rotate_image · zoom_image_factor · zoom_image_size

*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.