fullseye

fly_hex_lattice — FLYVISION lattice op

• データ種: なし → table(引数だけで決まる op —— 画像やデータの入力を取らない)
• 呼び出し: import fullseye as fs; fs.ledger.fly_hex_lattice(radius=15, dphi_deg=4.63, az0_deg=0.0, el0_deg=0.0, geometry='regular') (実装を直接呼ぶなら import flyvision; flyvision.fly_hex_lattice(radius=15, dphi_deg=4.63, az0_deg=0.0, el0_deg=0.0, geometry='regular')、台帳から引くなら opsflyvision.get("fly_hex_lattice"))

使い方

Hexagonal ommatidial lattice: viewing directions of a compound eye.

A hexagon of n = 3*radius*(radius+1)+1 ommatidia on axial coordinates (u, v) with -radius <= u <= radius and max(-radius, -radius-u) <= v <= min(radius, radius-u) (u outer, v inner), each given an azimuth, an elevation and a unit viewing direction in body coordinates (x forward, y left, z up; az = atan2(y, x) left positive, el = asin(z)).

geometry="regular": az = az0 + dphi*(v + u/2), el = el0 + dphi*(sqrt(3)/2)*u — an isotropic hexagon. geometry="boxeye": the pixel-grid distortion of the connectome-derived models, pixel (y, x) = (13*(u + v/2), 13*v) with 13 px = dphi, so az = az0 - v*dphi and el = el0 - (u + v/2)*dphi; the diagonal neighbour is 1.118x the axial spacing.

radius: the hexagon radius in ommatidia. dphi_deg: the inter-ommatidial angle in degrees. az0_deg / el0_deg: the direction of the lattice centre (the optical axis). geometry: one of :data:GEOMETRIES.

Returns a dict {"uv": (n,2) int, "az_rad": (n,), "el_rad": (n,), "dirs": (n,3) unit vectors, "dphi_rad": float, "geometry": str}.

Ground truth: n == 3*radius*(radius+1)+1 exactly, every dirs row is a unit vector, and for "boxeye" the ratio of the diagonal to the axial nearest-neighbour angular spacing is 1.118 (both pinned in the tests).

Raises ValueError: a radius outside [1, MAX_LATTICE_RADIUS], a non-positive dphi_deg, a non-real / non-finite / string / bool angle, and an unknown geometry.

参考(サンプルデータ・文献)

• サンプルデータ カタログ(DL URL / ライセンス) — 2-D は skimage.data(BSD/public)+ 合成、3-D は実データ源(Stanford/PDS 等)の DL URL。
• 演算子の来歴・参考文献 — この op 族の元になった研究/手法の出典。
• アルゴリズムの正典(著者・年)と用途は上記ファミリ使い方ガイドに記載。

実行できる例(この op を実際に呼ぶ検証済みサンプル)

• poc_fly_vision — py -3.11 examples/poc_fly_vision.py
• poc_print_registration — py -3.11 examples/poc_print_registration.py

型が繋がる次の op(table を入力に取れる)

fly_hex_resample · fly_hs_readout

同カテゴリ(lattice)

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Provenance: flyvision.py — FLYVISION operator registry. この per-op ノートは tools/opdocs.py md が自動生成(手編集しない)。

© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.

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