displacement_series — MOTIONMAG measure op

データ種: videopairs

呼び出し: import motionmag; motionmag.displacement_series(video, f_lo, f_hi, fps, scales: 'int' = 4, orientations: 'int' = 4) -> 'np.ndarray' (または opsmotionmag.get("displacement_series"))

使い方

Whole-frame displacement waveform -> `(T, 2) array of (dx, dy)`.

The contrast-weighted spatial mean of :func:phase_displacement, i.e. the

rigid-body motion of the scene in pixels, one row per frame. This is the

trace to plot, or to feed to `dsp.spectrum` to read off the resonant

frequency — a vibration waveform recovered from a camera.

Weights are the same `|z|^2` contrast the field solve uses, restricted to

the pixels marked `valid`, so blank regions do not drag the average

towards zero. A clip with no valid pixel anywhere (a constant image) returns

exact zeros rather than a division by zero.

Sub-pixel accuracy and its cliff inherit from :func:phase_displacement;

measured on the 64x64x64 / 8 px / 4 Hz synthetic, a true 0.5 px amplitude is

recovered as 0.50000000 px (6.7e-16 relative), and a true 0.001 px amplitude

as 0.00100000 px (8.7e-15).

詳しい使い方ガイド

motion_magnification ファミリ ガイド

参考(サンプルデータ・文献)

• サンプルデータ カタログ(DL URL / ライセンス) — 2-D は skimage.data(BSD/public)+ 合成、3-D は実データ源(Stanford/PDS 等)の DL URL。

• 演算子の来歴・参考文献 — この op 族の元になった研究/手法の出典。

• アルゴリズムの正典(著者・年)と用途は上記ファミリ使い方ガイドに記載。

実行できる例(この op を実際に呼ぶ検証済みサンプル)

motion_magnificationpy -3.11 examples/motion_magnification.py

quaternion_monogenicpy -3.11 examples/quaternion_monogenic.py

型が繋がる次の op(pairs を入力に取れる)

同カテゴリ(measure)

phase_displacement


*Provenance: motionmag.py — MOTIONMAG 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.