typed op• 数据种类:signal → signal
• 调用:fullseye.apply(img, "tb_fly_lgmd_eta", a=0.5, b=0.5)(2-D 的模型是一张图 + 两个标量旋钮 a,b∈[0,1])
*图为在 128×128 合成输入上实际运行的输出。左为输入，右为输出。点云以俯视散点显示(亮度 = z)，一维序列为折线，体数据为沿 z 的最大值投影，视频为中间帧，复数图像为幅值；无法成像的返回值直接显示数值。*
扫描旋钮 a(0.1 / 0.5 / 0.9，另一旋钮取默认):
▸ tb_fly_lgmd_eta: knob a sweep (docs site)
*旋钮 b 不改变输出(实测: 0.1 / 0.5 / 0.9 相同)。*
阶段(前置算子 → 本算子，从左到右):
▸ tb_fly_lgmd_eta: stages (docs site)
换别的图像(合成场景 / 照片 / 硬币。上排为输入，下排为对应输出。旋钮取默认):
▸ tb_fly_lgmd_eta: other inputs (docs site)
> 该算子的说明尚无译文,以下照原文给出。
LGMD/eta looming response from an expanding subtended angle.
The multiplicative looming model::
eta(t) = theta'(t - delay) * exp(-alpha * theta(t - delay))
where *theta_signal* is the object's full subtended angle over time, in
radians. The product of the angular expansion rate and an exponentially
decaying gain gives a response that peaks a fixed time before collision.
theta_signal: the full subtended angle per sample, radians.
dt_s: the sample interval, seconds.
alpha: the gain-decay constant.
delay_s: a fixed neural delay, seconds.
Returns a 1-D float64 array `eta(t)` of the same length.
Ground truth: for an object of half-size `l approaching at speed |v|`,
`eta peaks at a time-to-contact of alpha*l/|v| - delay_s` (Gabbiani et
al. Eq. 5), where the subtended angle is exactly `2*atan(1/alpha)` (Eq. 6;
24.0 degrees for `alpha = 4.7`) — both pinned in the tests.
Raises `ValueError`: a non-1-D / empty / too-short (< 3) / non-finite
*theta_signal*, a signal over :data:MAX_SIGNAL_POINTS, a non-positive *dt_s*
/ *alpha*, and a negative *delay_s*.
Typed bridge of the flyvision op `fly_lgmd_eta into the 2-D evolution registry: the same implementation, called under the op(v, a, b) convention. a drives alpha (default 4.7); b` is unused.
• 示例数据目录(下载 URL / 许可证) —— 2-D 用 skimage.data(BSD/公有领域)加合成图,3-D 给出真实数据源(Stanford/PDS 等)的下载 URL。
• 算子来历与参考文献 —— 该算子族所依据的研究/方法出处。
下面的程序已确认可以运行(与图相同的输入)。在 Studio 帮助中，此块会变成按钮，可当场加载并运行。
img_to_signal 0.50 0.50 tb_fly_lgmd_eta 0.50 0.50
▸ Load this pipeline · Load & run
下面的示例调用的是底层账本算子 fly_lgmd_eta。此桥接算子只是把同一实现适配为 fn(v, a, b) 约定，行为完全相同(只是调用形式不同)。
• poc_fly_vision — py -3.11 examples/poc_fly_vision.py
signal 作为输入)identity · tb_create_funct_1d_array · tb_smooth_funct_1d_gauss · tb_smooth_funct_1d_mean · tb_derivate_funct_1d · tb_integrate_funct_1d · tb_zero_crossings_funct_1d · tb_abs_funct_1d
typed)tb_points_to_voxel · tb_estimate_point_normals · tb_iss_keypoints · tb_project_points · tb_render_point_depth · tb_statistical_outlier_removal · tb_radius_outlier_removal · tb_voxel_grid_downsample
*Provenance: ops.py — 2D 算子登记表。本条目由 tools/opdocs.py md 自动生成(请勿手工编辑)。*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.