micromotion
Analysis of human micromotion in motion time series: optical marker data, body-worn accelerometers, respiration belts and force plates.
The measure the package exists for is quantity of motion — the average speed of a body part, band-limited to 0.2–5 Hz, in millimetres per second. It applies equally to all three sensor families because the shared abstraction is the frequency band, not the instrument.
pip install micromotion
import micromotion as mm
rec = mm.read("Standstill2017/mocap_data/A0001.tsv") # dispatches on content, not extension
head = rec.marker("P01")
mm.qom(head, rec.fs, kind="position").mean_mm_s
Documentation
| Reference documentation | how to use it, every function, the conventions |
| Wiki | why it works this way — traps, recipes, open questions |
| Changelog | what changed, and why |
New to it: Getting started, then The two bands, which is the one convention you cannot skip.
Reading files is its own subject, because the formats in this field lie about themselves: Reading files covers what each reader handles, which axis is vertical in which system, and the traps that produce plausible numbers rather than errors — a Y/Z axis swap that reverses every sway direction while leaving magnitudes intact, a Unicode minus that turns negative values into NaN, an app whose clock stops when the phone sleeps.
What is in it
| Module | Contents |
|---|---|
qom |
quantity of motion from position or acceleration |
filters |
the band definitions, band-pass, low-pass, high-pass, cardiac notch |
resample |
rate measurement, downsample-only resampling, irregular-to-regular gridding |
validate |
checks that fail loudly on silently-wrong data |
posture, balance |
sway geometry, centre-of-pressure measures |
spectral, physio |
cardiac and respiratory peaks, band power, breathing rate |
dynamics |
DFA, multifractality, recurrence, surrogates, entropy |
group |
whether these people moved at the same moments |
align, circular |
offsets between clocks; directional statistics |
io, record |
one reader per corpus layout, a content sniffer, a common record type |
Readers: Qualisys and Qualisys-style TSV in all three header shapes, Sverm, Axivity AX3,
Physics Toolbox phone logs (raw app export or cleaned), Equivital, Wii balance board, Artinis
fNIRS. read dispatches on content rather than extension, because in this corpus the extension
is frequently wrong.
Why it exists
It was built while constructing a single analysis across every dataset in the Oslo Standstill Database. There were 159 analysis scripts, of which 58 defined their own band-pass filter and 37 computed quantity of motion. The project's central measure existed in dozens of copies that did not all agree, and the disagreements were invisible.
Every default here was measured rather than assumed, and the reasoning is kept beside it. The traps page lists the mistakes that shaped the design; each one happened, produced a believable wrong number, and raised nothing at the time.
Requirements
Python 3.10+, numpy, scipy, pandas.
Licence
GPL-3.0-or-later. If you use it, please cite it — see CITATION.cff.
1 maintainer
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