caliper op• Data kinds: none → measurehandle (an op determined by its arguments alone — it takes no image or data input)
• Call: import fullseye as fs; fs.ledger.gen_measure_arc(center_row, center_col, radius, angle_start, angle_extent, width, shape) (to call the implementation directly, import measuring1d; measuring1d.gen_measure_arc(center_row, center_col, radius, angle_start, angle_extent, width, shape); from the registry, opsmeasure1d.get("gen_measure_arc"))
> This operator's description has not been translated yet. The original text follows as it is.
測定弧(円周方向に ≈1 px 間隔でプロファイルを取る)を定義(gen_measure_arc)。
サンプル数 n = round(|angle_extent|*radius)+1、`spacing` = 弧長/(n-1)。
弧上のサンプル点は `row = center_row + radius sin(θ)`、
`col = center_col + radius cos(θ)、θ = angle_start + linspace(0, angle_extent, n)`。
角度は ラジアンで、col 軸(x)から row 軸(画像下向き)へ回る向きが正。
`angle_extent が負なら逆回りに進み、measure_pos の pos / dist` は
その進行方向に沿って数える。
• `radius: [px]。n = max(2, round(|angle_extent| * radius) + 1)` なので、
半径や角度幅が小さすぎるとサンプル 2 点・`spacing` が弧長そのものになる。
`radius = 0 は spacing = 0` になり後段の微分で破綻する(ここでは検証しない)。
• `width: 幅方向(法線)の平均化幅 [px]。int` に切られ、1 以下なら平均なし。
• `shape: 画像の (H, W)`。dict に保存されるだけで、範囲外は
`measure_pos` 側が最近傍で外挿する(例外は出ない)。
• 返り値: ``{"type": "arc", "rows", "cols", "width", "shape", "spacing", "center",
"radius", "angles"}` の dict(measurehandle` 型)。
`measure_pos / measure_pairs / fuzzy_measure_pairing` に渡す。直線なら
`gen_measure_rectangle2。位置決め後は translate_measure` で動かす。
• subpixel_measuring 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.
• poc_dimensional_inspection — py -3.11 examples/poc_dimensional_inspection.py
measurehandle as input)translate_measure · measure_pos · measure_pairs · fuzzy_measure_pairing
caliper)gen_measure_rectangle2 · translate_measure · measure_pos · measure_pairs · fuzzy_measure_pairing
*Provenance: measuring1d.py — MEASURE1D 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.