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)

zoom_image_factor: 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

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.

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.

zoom_image_factor 0.50 0.50

▸ Load this pipeline · Load & run

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).*

zoom_image_factor — 2D geometry op