typed op• 資料種類:signal → feature
• 呼叫:fullseye.apply(img, "tb_zero_crossing_rate", a=0.5, b=0.5)(2-D 的模型是一張圖 + 兩個純量旋鈕 a,b∈[0,1])
*無圖: 該運算子以 signal 為輸入。從影像開始的 Studio 程式無法到達該型別，請參見下方的可執行範例。*
相鄰取樣點中符號發生變化的比例——一種低成本的音高/雜訊程度線索。
> 以下的詳細說明為原文 —— 摘要與標題已翻譯。
Exact zeros are neither a crossing nor a sign: a crossing is counted only when
the sign changes between consecutive *non-zero* samples, and the rate divides
by the number of adjacent sample pairs `len(x) - 1. So [1, 0, 1, 0, 1]` is
`0.0 and [1, 0, -1] is 0.5 (before 2026-09-02 diff(sign(x))` counted
every touch of zero as a crossing: `1.0` for both).
Typed bridge of the 1d op `zero_crossing_rate into the 2-D evolution registry: the same implementation, called under the op(v, a, b) convention. This op has no tunable parameter; a and b` are unused.
• 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。
• (尚無)
feature 作為輸入)typed)tb_points_to_voxel · tb_estimate_point_normals · tb_iss_keypoints · tb_angle_3points · tb_project_points · tb_render_point_depth · tb_statistical_outlier_removal · tb_radius_outlier_removal
*Provenance: ops.py — 2D 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.