xcv_pencil_sketch — 2D artistic op

• Data kinds: image → image

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

Usage

OpenCV's pencilSketch (pencil-drawing-style rendering).

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

エッジ保存平滑化とドッジ合成で鉛筆デッサン風の白黒スケッチを作る

(返り値のうちグレースケール版のみ使用し、カラー版は捨てている)。

`a が平滑化の空間範囲 sigma_s を 20〜100 で振る。b` は

色差許容 `sigma_r(0.05〜0.2)と陰影の濃さ shade_factor`

(0.02〜0.08)の両方を同時に振る(2 つのパラメータを 1 つのノブに

まとめている)。

Detailed usage guide

• gallery2d_color_artistic 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_color_artistic — py -3.11 examples/gallery2d_color_artistic.py

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

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

Same category (artistic)

xcv_stylization · xpil_emboss

*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.