geometry op• Data kinds: image → image
• Call: fullseye.apply(img, "rescale_img", a=0.5, b=0.5) (the 2-D model is one image plus two scalar knobs a,b∈[0,1])
• HALCON equivalent: zoom_image_factor (the HALCON reference is a useful guide to its meaning and parameters)
Isotropic centre-preserving rescale by `s = 0.7 + 0.6·a`, canvas kept.
> The detailed description below is the original text — the summary and the headings are translated.
`b = **補間の次数** — (0, 1, 3, 3)[min(3, int(4b))]`(0 = 最近傍、
1 = 双一次、3 = 三次スプライン)。`b=0.5 は 3 次で、b` が死んでいた頃の
既定(`ndimage` の order=3)と ビット一致する。
★2026-09-02: それまで `rescale_img / zoom_image_factor` /
`zoom_image_size` は 3 つとも同じ実装(実測: 相互の最大差 0.0 と
4.9e-14)で、3 つとも `b` を使っていなかった。3 つの役割を分けた:
• `rescale_img` — 等方倍率 1 つ + 補間次数(この関数)
• `zoom_image_factor`— 縦横 2 つの倍率(HALCON の ScaleHeight/ScaleWidth)
• `zoom_image_size` — 目標サイズ指定(出力 shape が変わる)
HALCON 名も実態に合わせて `zoom_image_size → zoom_image_factor` へ
付け替えた(この op はサイズではなく倍率で駆動するため)。
• gallery2d_geometry family guide
• 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.
• gallery2d_geometry — py -3.11 examples/gallery2d_geometry.py
image as input)identity · gaussian · mean_box · bilateral · unsharp · median · min_filter · max_filter
geometry)rotate_img · affine_warp · 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.