rank op• Data kinds: image → image
• Call: fullseye.apply(img, "xpil_mode_filter", 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).*
Mode filter. Uses `PIL.ImageFilter.ModeFilter` to replace each pixel with the most frequent value within the window (differs from a median filter in taking the mode rather than the median).
> The detailed description below is the original text — the summary and the headings are translated.
a が窓サイズを 3/5/7/9 の 4 段階（`3 + 2*int(a*3)`）で振る。b は未使用。単色の塗りつぶし領域が多い画像（ラベル画像・漫画調画像）のノイズ除去に向き、階調が滑らかな自然画像では効果が薄い。
• 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.
xpil_mode_filter 0.50 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
rank)median · min_filter · max_filter · percentile · sk_median_disk · cv_median · median_image · median_rect
*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.