lattice op• 데이터 종류: 없음 → table(인자만으로 정해지는 연산자 —— 이미지나 데이터 입력을 받지 않습니다)
• 호출: import fullseye as fs; fs.ledger.fly_vogel_lattice(radius=15, dphi_deg=4.63, az0_deg=0.0, el0_deg=0.0, density_power=0.5, angle_deg=np.float64(137.50776405003785))(구현을 직접 호출하려면 import flyvision; flyvision.fly_vogel_lattice(radius=15, dphi_deg=4.63, az0_deg=0.0, el0_deg=0.0, density_power=0.5, angle_deg=np.float64(137.50776405003785)), 원장에서 가져오려면 opsflyvision.get("fly_vogel_lattice"))
피보나치(Vogel 나선) 겹눈 —— 육각 눈과 같은 낱눈 수·같은 평균 간격이지만 격자가 없음.
> 아래 상세 설명은 원문입니다 —— 요약과 제목은 번역되어 있습니다.
Point k sits at the angular radius rho_k = rho_max ((k + 1/2)/n)^p from the optical axis and at the position angle k * angle_deg around it — the arrangement of sunflower florets (Vogel 1979), here on the sphere. The ommatidia count is the hexagon's n = 3 radius (radius + 1) + 1 and rho_max is solved so that the mean nearest-neighbour angle equals dphi_deg, which makes the two eyes directly comparable: same number of samples, same average density, and only the *arrangement* differs. The reciprocal of a hexagonal lattice is six sharp points, so a texture past its Nyquist limit folds into one sharp false stripe (moire); the Vogel spiral has no reciprocal lattice, so the same texture folds into a ring of weak noise — the question the zebra PoC asks is which an eye would rather have.
radius / dphi_deg / az0_deg / el0_deg: as fly_hex_lattice.
density_power: p in (0, 1]. 0.5 is uniform density; above it the
centre is denser (a fovea / acute zone: density ∝ k^(1 - 2p)), below it
the rim is.
angle_deg: the divergence angle, the golden angle by default.
Returns a lattice dict with the keys of fly_hex_lattice — "uv" holds (k, 0), the spiral index, so (0, 0) is still the ommatidium nearest the axis — plus "geometry": "vogel", "rho_rad" (the angular radius of each ommatidium), "nn_rad" (its nearest-neighbour angle) and "density_power". The ops that need a *hexagonal neighbour* (fly_t4t5_field, fly_flow_from_directions) refuse it; the ops that need only directions (fly_view_plane_texture, fly_expansion_readout, lattice_moire_peak, fly_matched_filter, fly_egomotion_from_flow) take it.
Ground truth (pinned in the tests): n == 3 radius (radius + 1) + 1, every direction is a unit vector, mean(nn_rad) == dphi to 1e-6, the coefficient of variation of the nearest-neighbour angle at p = 0.5 is 0.012 (below 0.03; a hexagon's is 0, and p = 0.65 gives 0.14), and the Delaunay triangulation of the gnomonic projection has a mean degree within 0.5 of 6 (5.85 for 721 ommatidia; the deficit is the rim).
Raises ValueError: a *radius* outside [2, MAX_LATTICE_RADIUS], a non-positive *dphi_deg*, a *density_power* outside (0, 1], a non-finite angle, and a divergence angle that is a multiple of 360 (all points on one ray).
• 샘플 데이터 카탈로그(DL URL / 라이선스) —— 2-D 는 skimage.data(BSD/public)+ 합성, 3-D 는 실데이터 소스(Stanford/PDS 등)의 DL URL.
• 연산자의 내력·참고문헌 —— 이 연산자 족의 바탕이 된 연구/기법의 출처.
• 알고리즘의 정전(저자·연도)과 용도는 위의 패밀리 사용 가이드에 적혀 있습니다.
• poc_print_registration — py -3.11 examples/poc_print_registration.py
• poc_zebra_stripes_fly_eye — py -3.11 examples/poc_zebra_stripes_fly_eye.py
table 를 입력으로 받는 것)fly_t4t5_field · fly_flow_from_directions · fly_matched_filter · fly_egomotion_from_flow · fly_eye_merge · fly_view_plane_texture · fly_hex_resample · fly_expansion_readout
lattice)*Provenance: flyvision.py — FLYVISION 연산자 레지스트리. 이 op 노트는 tools/opdocs.py md 가 자동 생성합니다(직접 편집하지 마세요).*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.