motion op• Data kinds: signal × signal → signal
• Call: import fullseye as fs; fs.ledger.fly_emd_response(signal_a, signal_b, tau_s=0.05, dt_s=0.001) (implementation को सीधे call करना हो तो import flyvision; flyvision.fly_emd_response(signal_a, signal_b, tau_s=0.05, dt_s=0.001), registry से लेना हो तो opsflyvision.get("fly_emd_response"))
दो पड़ोसी ommatidial signals के बीच Hassenstein-Reichardt correlator।
> नीचे का विस्तृत विवरण मूल text में है — सारांश और headings का अनुवाद हो चुका है।
The opponent elementary motion detector::
R(t) = LP(a)(t) * b(t) - a(t) * LP(b)(t)
where LP is a first-order low-pass of time constant *tau_s*. Delaying one channel and multiplying it against the other, then subtracting the mirror pair, gives a signal whose sign is the direction of motion and whose steady-state mean encodes the temporal frequency.
signal_a / signal_b: the two 1-D input time series (same length).
tau_s: the low-pass time constant, seconds.
dt_s: the sample interval, seconds.
Returns a 1-D float64 array R(t) of the same length.
Ground truth: for two sinusoids of temporal frequency f (omega = 2 pi f) with a spatial phase psi = 2 pi dphi/lambda between them, the steady-state mean is R_bar = dI^2 * sin(psi) * omega tau/(1 + (omega tau)^2) (to 5%), which is zero at lambda = 2 dphi (psi = pi) and maximal at f = 1/(2 pi tau) independent of lambda (pinned in the tests).
Raises ValueError: a non-1-D / empty / too-short (< 2) / non-finite *signal_a* or *signal_b*, mismatched lengths, a signal over MAX_SIGNAL_POINTS, and a non-positive *tau_s* / *dt_s*.
• Sample data catalog (DL URL / license) — 2-D के लिए skimage.data (BSD/public) + synthetic, 3-D के लिए real data sources (Stanford/PDS आदि) के DL URL।
• Operators का स्रोत और संदर्भ — इस op family के मूल research/methods के स्रोत।
• Algorithm का मानक स्रोत (लेखक, वर्ष) और उपयोग ऊपर की family usage guide में दिए गए हैं।
• poc_fly_vision — py -3.11 examples/poc_fly_vision.py
signal को input के रूप में लेते हैं)fly_hex_quantize · fly_lgmd_eta · fly_tau_from_expansion · fly_dsi
motion)—
*Provenance: flyvision.py — FLYVISION operator registry. यह per-op note tools/opdocs.py md से अपने-आप generate होता है (हाथ से edit न करें)।*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.