wave opimage2d → measurementimport fullseye as fs; fs.ledger.wave_fringe_period(image, axis=1) (実装を直接呼ぶなら import mathops; mathops.wave_fringe_period(image, axis=1)、台帳から引くなら opsmath.get("wave_fringe_period"))The period of a striped image, measured back out of it (pixels).
Takes the mean profile along axis, removes the mean, and reads the dominant frequency from the FFT with a parabolic interpolation on the log spectrum, so the answer is not quantised to the FFT bin.
★Why this earns its place: it closes the loop on :func:wave_two_slit and
on any halftone or grating image — the period predicted by the closed form and
the period measured from the pixels are two different computations.
Returns a measurement: the period in pixels.
Raises ValueError: not a 2-D array; fewer than 8 samples along axis;
non-finite values; a profile with no variation (a flat image has no period).
Empty input (image with 0 elements) raises ValueError.
mathops の全 op は入力を検証してから計算する(黙って通さない):
ValueError — float64 への強制変換は虚部を黙って捨てる(numpy は ComplexWarning だけ出して「もっともらしく間違った」実数を返す)。.real/.imag/abs() を明示するか、複素対応の complexops を使う。ValueError — マスクを剥がして下の生値を使う暗黙変換を拒否。埋める/落とすを明示する。ValueError(件数を明示して拒否 — 結果全体に伝播するため)。ValueError。reshape を明示する)。stat_histogram の bins は mathops.MAX_ELEMENTS(2^26 ≈ 6700 万要素)超で ValueError。py -3.11 examples/poc_beats_fringes_and_screens.pymeasurement を入力に取れる)—
wave)wave_membrane_mode · wave_mode_frequencies · wave_nodal_lines · wave_two_slit · wave_grating_orders
Provenance: mathops.py — MATH operator registry. この per-op ノートは tools/opdocs.py md が自動生成(手編集しない)。
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.