smoothing op• Data kinds: image → image
• Call: fullseye.apply(img, "sk_rolling_ball", a=0.5, b=0.5) (the 2-D model is one image plus two scalar knobs a,b∈[0,1])
*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).*
Background subtraction by the rolling-ball method. Treats image brightness as terrain, rolls a ball of a given radius underneath it, estimates the resulting envelope surface as the background, and subtracts it from the original image -- used to remove uneven illumination (gradual brightness gradients).
> The detailed description below is the original text — the summary and the headings are translated.
HALCON に直接対応するものは無い。実装は `v - restoration.rolling_ball(v, radius=5+int(a*20)) を [0,1]` へ clip したもの —— a は球の半径を 5〜25 に振る(大きいほど緩やかな照明ムラしか背景とみなさず、細かい構造は残る)。b は未使用。
• gallery2d_smoothing_rank 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.
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.
sk_rolling_ball 0.35 0.50
▸ Load this pipeline · Load & run
• gallery2d_smoothing_rank — py -3.11 examples/gallery2d_smoothing_rank.py
image as input)identity · gaussian · mean_box · bilateral · unsharp · median · min_filter · max_filter
smoothing)gaussian · mean_box · bilateral · unsharp · sk_tv · sk_wavelet · sk_nlm · sk_tv_bregman
*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.