xsp_hilbert_env — 2D `texture` op

• Data kinds: image → image

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

Usage

Extracts the amplitude envelope of the analytic signal (Hilbert transform) along the row direction.

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

画素値を [-0.5, 0.5] に平行移動してから各行に 1 次元ヒルベルト変換

（`scipy.signal.hilbert`）を掛け、複素解析信号の絶対値（瞬時振幅）を

正規化して返す。`a, b` は未使用。周期的な縞模様やテクスチャの

「包絡線」を強調するのに向き、位相情報は捨てて振幅だけを残す。列方向

には掛からないため、結果は水平方向の変化にのみ反応する。

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).*

xsp_hilbert_env — 2D texture op