edges op• Data kinds: image → image
• Call: fullseye.apply(img, "xsk3_corner_fast", 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).*
FAST corner detection (skimage `feature.corner_fast`). A fast technique that compares against the pixels on a circle around the center pixel and detects as corners locations where a run of consecutively brighter/darker pixels continues for at least a certain count. The result is a response map normalized by its maximum absolute value.
> The detailed description below is the original text — the summary and the headings are translated.
`a は連続画素数のしきい値 n(9+int(a*3) で 9〜12)、b は輝度差のしきい値(0.05+0.2*b` で 0.05〜0.25)を振る。
• gallery2d_edges 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.
xsk3_corner_fast 0.40 0.50
▸ Load this pipeline · Load & run
• gallery2d_edges — py -3.11 examples/gallery2d_edges.py
image as input)identity · gaussian · mean_box · bilateral · unsharp · median · min_filter · max_filter
edges)sobel_mag · prewitt_mag · roberts_mag · dog · grad_dir · log · corner_response · sk_scharr
*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.