scoop op• Data kinds: image2d × scalar → image2d
• Call: import fullseye as fs; fs.ledger.stream_areal_density(coverage, radius_px: 'float', *, c_max: 'float' = 0.95, mode: 'str' = 'raise') -> 'np.ndarray' (to call the implementation directly, import scoop; scoop.stream_areal_density(coverage, radius_px: 'float', *, c_max: 'float' = 0.95, mode: 'str' = 'raise') -> 'np.ndarray'; from the registry, opsdrive.get("stream_areal_density"))
Inverts the Boolean model to get the areal density of particle centers [particles / px²] from the coverage, n = −ln(1 − c) / (π r²).
> The detailed description below is the original text — the summary and the headings are translated.
独立に置いた半径 r の円板の和の被覆率は c = 1 − exp(−n π r²)(重なりを数え落とさない)。素朴な c / (π r²) は c = 0.8 で 2 倍近く数え落とす(PoC の門)。c が 1 に近いと逆は発散する(厚い流れは向こうが
見えない): mode="raise" は c ≥ c_max の画素があれば ValueError、"clip" は c_max に切る(下限の推定になる)。粒の位置が独立でない密な流れ(口の近く、粒が接している)では模型が外れる —— 限界。Raises ValueError: 被覆率でない / 飽和(mode="raise")/ 綴り違い。
• 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.
• (none yet)
image2d as input)flow_from_depth_motion · ttc_truth · ttc_from_flow · foe_from_flow · perlin2 · fbm_height · fbm_gradient · radial_periodogram
scoop)spoon_bowl_volume · scoop_synth_side · revolution_volume_side · two_view_volume · scoop_volume_read · scoop_count · scoop_image_limit · tilt_wedge_retained
*Provenance: scoop.py — DRIVE 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.