f2_symmetry — 2D `texture` op

• Data kinds: image → image

• Call: fullseye.apply(img, "f2_symmetry", a=0.5, b=0.5) (the 2-D model is one image plus two scalar knobs a,b∈[0,1])

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

Usage

Local reflective symmetry of gray values along a row. For each pixel the weighted asymmetry sum_d (1/d)|I(i,j-d) - I(i,j+d)| over d=1..r is measured; a low response means the neighbourhood is left-right symmetric about that column. `a sets the radius r (1..6); b` is ignored. Output is the asymmetry response normalised to [0,1].

Detailed usage guide

• gallery2d_texture_freq 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_texture_freq — py -3.11 examples/gallery2d_texture_freq.py

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

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

Same category (`texture`)

std_filter · gabor · sk_frangi · sk_meijering · sk_hessian · sk_gabor · sk_lbp · sk_entropy

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

f2_symmetry — 2D texture op