texture op• Data kinds: image → image
• Call: fullseye.apply(img, "texture_laws", a=0.5, b=0.5) (the 2-D model is one image plus two scalar knobs a,b∈[0,1])
• HALCON equivalent: texture_laws (the HALCON reference is a useful guide to its meaning and parameters)
The implementation is the local variance (the variance version of `deviation_image, i.e. E[x^2]-E[x]^2 within the window). The true Laws' texture filter is a bank of 25 convolutions built from 1D kernel pairs such as L5/E5/S5/W5/R5 (capturing energy/edges/waves/spots/ripples), but this substitute uses a single local variance instead of the full kernel bank (a limitation of the approximation -- direction- and frequency-specific information is lost). A stand-in for HALCON's texture_laws` (Filter an image using a Laws texture filter).
> The detailed description below is the original text — the summary and the headings are translated.
`a が窓の一辺を {3,5,7,9} で振る。b` は未使用。
• gallery2d_texture_freq 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_texture_freq — py -3.11 examples/gallery2d_texture_freq.py
image as input)identity · gaussian · mean_box · bilateral · unsharp · median · min_filter · max_filter
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).*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.