tuning op• 資料種類:signal → table
• 呼叫: import fullseye as fs; fs.ledger.fly_dsi(responses, angles_deg)(要直接呼叫實作,import flyvision; flyvision.fly_dsi(responses, angles_deg);從台帳取用則 opsflyvision.get("fly_dsi"))
> 該運算子的說明尚無譯文,以下照原文給出。
Direction-selectivity index and preferred direction from tuning responses.
A vector sum on the circle::
DSI = |sum_k r_k exp(i theta_k)| / (sum_k r_k + 1e-9)
preferred = angle(sum_k r_k exp(i theta_k))
where r_k >= 0 is the response to a stimulus moving at angle theta_k = angles_deg[k] (negatives clipped to 0).
responses: a 1-D array of responses, one per direction.
angles_deg: the stimulus directions in degrees, same length.
Returns a dict {"dsi": float, "pref_deg": float} with pref_deg in [-180, 180].
Ground truth: a response at a single direction gives dsi == 1; an isotropic response over directions evenly spanning the circle gives dsi == 0 (pinned in the tests).
Raises ValueError: a non-1-D / empty / non-finite *responses* or *angles_deg*, mismatched lengths, an array over MAX_SIGNAL_POINTS, and an all-zero *responses* (no direction tuning to report).
• 範例資料目錄(下載 URL / 授權) —— 2-D 用 skimage.data(BSD/公有領域)加合成圖,3-D 給出真實資料源(Stanford/PDS 等)的下載 URL。
• 運算子來歷與參考文獻 —— 該運算子族所依據的研究/方法出處。
• 演算法的正典(作者、年份)與用途見上面的族使用指南。
• poc_fly_vision — py -3.11 examples/poc_fly_vision.py
table 作為輸入)fly_t4t5_field · fly_flow_from_directions · fly_matched_filter · fly_egomotion_from_flow · fly_eye_merge · fly_hex_resample · fly_hs_readout
tuning)—
*Provenance: flyvision.py — FLYVISION 運算子登記表。本條目由 tools/opdocs.py md 自動產生(請勿手動編輯)。*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.