displacement_series — MOTIONMAG `measure` op

• 数据种类:video → pairs

• 调用:import motionmag; motionmag.displacement_series(video, f_lo, f_hi, fps, scales: 'int' = 4, orientations: 'int' = 4) -> 'np.ndarray'(或 opsmotionmag.get("displacement_series"))

用法

整帧位移波形 -> `(dx, dy) 的 (T, 2)` 数组。

> 以下的详细说明为原文 —— 摘要与标题已翻译。

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).

详细使用指南

• motion_magnification 族使用指南

参考(示例数据・文献)

• 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。

• 算法的正典(作者・年份)与用途见上面的族使用指南。

可运行的示例(实际调用该算子并已验证的样例)

• motion_magnification — py -3.11 examples/motion_magnification.py

• quaternion_monogenic — py -3.11 examples/quaternion_monogenic.py

类型可衔接的下一个算子(可接受 `pairs` 作为输入)

—

同类别(`measure`)

phase_displacement

*Provenance: motionmag.py — MOTIONMAG 算子登记表。本条目由 tools/opdocs.py md 自动生成(请勿手工编辑)。*

displacement_series — MOTIONMAG measure op

用法