dl_aniso_diffusion — 2D `smoothing` op

• Data kinds: image → image

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

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

dl_aniso_diffusion: 入力 → 出力

*The figure is the real output on a synthetic 128×128 input. Left: input, right: output (a non-image return value is shown as the value itself).*

Usage

A Perona-Malik-type anisotropic diffusion filter (torch implementation; runs on the GPU if one is available).

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

上下左右 4 方向の差分にそれぞれ `exp(-(差分/K)^2)` の伝導度を掛けてから加算する

反復拡散で、勾配が大きい（エッジらしい）場所ほど拡散が弱まり、エッジを保ったまま

平滑化する。`a はエッジ検出しきい値 K を 0.02〜0.22 に振る（`K = 0.02 +

0.2*a`、大きいほどエッジを跨いで拡散しやすくなる）。b` は反復回数を 5〜20 回に

振る（`iters = 5 + int(b*15)）。ステップ幅 lam=0.2` は固定。ガウシアンぼかしと

異なりエッジをぼかさずにノイズだけ均せるのが利点。HALCON の

`anisotropic_diffusion`（画像の異方性拡散を行う）に相当するが、同じ結果になる

とは限らない近似実装。

Detailed usage guide

• gallery2d_smoothing_rank 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.

Try it in Studio

The program below has been verified to run (same input as the figure). In Studio's help this block becomes buttons that load and run it on the spot.

dl_aniso_diffusion 0.35 0.50

▸ Load this pipeline · Load & run

Runnable examples (verified samples that actually call this op)

• gallery2d_smoothing_rank — py -3.11 examples/gallery2d_smoothing_rank.py

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

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

Same category (`smoothing`)

gaussian · mean_box · bilateral · unsharp · sk_tv · sk_wavelet · sk_rolling_ball · sk_nlm

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

dl_aniso_diffusion — 2D smoothing op