hx_fit_surface2 — 2D `halcon_ext` op

• Data kinds: image → image

• Call: fullseye.apply(img, "hx_fit_surface2", a=0.5, b=0.5) (the 2-D model is one image plus two scalar knobs a,b∈[0,1])

• HALCON equivalent: fit_surface_second_order (the HALCON reference is a useful guide to its meaning and parameters)

Usage

Fits the gray values with a second-order polynomial surface by least squares. Corresponds to HALCON's `fit_surface_second_order` (computes gray-value moments and fits a second-order surface).

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

基底を `[1, x, y, x^2, y^2, xy] に拡張したこと以外は hx_fit_surface1`

と同じ(座標 [-1,1] 正規化 -> 最小二乗 -> [0,1] 正規化)。曲がった照明ムラや

緩い凹凸の背景推定に使う。`a, b` は未使用。

Detailed usage guide

• gallery2d_halcon_ext 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_halcon_ext — py -3.11 examples/gallery2d_halcon_ext.py

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

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

Same category (`halcon_ext`)

hx_gen_circle · hx_gen_ellipse · hx_gen_rectangle2 · hx_gen_checker_region · hx_gen_grid_region · hx_gabor · hx_fit_surface1 · hx_cooc_feature

*Provenance: ops.py — 2D operator registry. This per-op note is generated by tools/opdocs.py md (do not hand-edit).*

hx_fit_surface2 — 2D halcon_ext op