zoom_image_factor — 2D geometry op

• Data kinds: image → image

• Call: fullseye.apply(img, "zoom_image_factor", 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)

Usage

A non-isotropic zoom with independent scale factors for the height and width directions (`0.7+0.6*a, 0.7+0.6*b). Scales via an affine transform relative to the center, keeping the canvas size unchanged (areas that overflow or remain are filled by reflection). Corresponds to HALCON's zoom_image_factor` (Zoom an image by a given factor), and like HALCON, takes two scale factors (ScaleHeight/ScaleWidth).

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

`a が縦方向の倍率、b` が横方向の倍率を振る。両方が使われる

(2026-09-02 以前は `zoom_image_size` と実装が重複していたが、現在は

別の `kind` に分離済み)。

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 · affine_warp · sk_swirl · mirror_image · transpose_region · rotate_image · 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.