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steps: replace the peak pedometer with a stride-periodicity gait counter - #97
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The title states the primary change: the peak-based pedometer is replaced by a stride-periodicity gait counter. The raw summary and PR objectives both describe this change to the steps.dart pedometer,… |
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The title states the primary change: the peak-based pedometer is replaced by a stride-periodicity gait counter. The raw summary and PR objectives both describe this change to the steps.dart pedometer, with matching changes to the StepParams constants, the Tier A tests, and the motion.dart documentation. The title is short, specific, and matches the changeset.
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Reviewer's GuideThe PR replaces the under-counting adaptive peak detector with a four-second autocorrelation-based gait detector that measures cadence, identifies step versus stride periodicity, and counts steps from gait duration; it also makes parameters time-based, preserves the public API, and updates tests and OxWalk validation documentation for the new behavior. Sequence diagram for measured-cadence pedometer processingsequenceDiagram
participant Caller
participant pedometer
participant GaitCounter
participant Decision
Caller->>pedometer: pedometer(sig, sampleRateHz)
pedometer->>GaitCounter: _gaitSteps(sig, sampleRateHz)
GaitCounter->>GaitCounter: _trailingMean()
GaitCounter->>Decision: _decide(window, sampleRateHz)
Decision-->>GaitCounter: stepS, sd, strideAc
GaitCounter->>GaitCounter: apply gait gate and minRun
GaitCounter->>GaitCounter: accumulate segment duration / stepS
GaitCounter-->>pedometer: measured step count
pedometer-->>Caller: rounded count
Flow diagram for autocorrelation gait step countingflowchart LR
A["Accelerometer magnitude signal"] --> B["Band-pass filtering"]
B --> C["Optional decimation to 50 Hz"]
C --> D["4 s window autocorrelation"]
D --> E["Select fundamental period"]
E --> F["Classify step or stride period"]
F --> G["Apply amplitude and stride-regularity gate"]
G --> H["Require 8 s gait run"]
H --> I["Count gait duration / measured step period"]
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therealslurp
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October 23, 2026 16:43
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Review comments at @lib/src/onehz/motion/steps.dart:
- Around line 156-158: Update the cadence-band documentation near `stepLoS` and
`stepHiS` to remove the claim that signals below 60 spm are not counted. Clarify
that slower step-only signals are handled by the step/stride decision and are
not simply dropped, while preserving the sprint-above-240-spm explanation.
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lib/src/onehz/motion/motion.dartlib/src/onehz/motion/steps.darttest/onehz/steps_test.dart
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The AN-2554-shaped peak counter scored MAPE 33.0% on OxWalk (39 adults,
free-living dominant wrist, camera ground truth), only 5/39 within +-10%,
and under-counted everyone who actually walked by ~25%: one weak footfall
reset its CONFIRM=8 run and its 0.10 g dead-zone dropped gentle walking.
No sens/confirm setting fixed that without 3-6x over-counting arm work.
The new counter decides gait per 1 s from the autocorrelation of a 4 s
band-passed |a| window: shortest strong period, a step-vs-stride decision
(the two populations separate cleanly on OxWalk), a stride-lag regularity
gate with hysteresis and an 8 s minimum run, then steps = time / measured
step period. All constants are in seconds.
OxWalk, production 60 s chunking, gain 1.00 (tool/oxwalk_validate.dart):
wrist 100 Hz MAPE 33.0% -> 16.7%, within 10% 5 -> 21 of 39,
walkers bias -25.4% -> -10.4%, totals -19.8% -> -7.3%
wrist 50 Hz 33.6% -> 16.9%
wrist 25 Hz 91.9% -> 17.3%
hip 100 Hz 29.5% -> 17.6%
Gate thresholds from a grid search; leave-one-participant-out MAPE 17.5%,
38/39 folds chose the same configuration. Cost: ~1.35 ms per minute of
100 Hz signal (AOT), up from 0.24 ms.
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the step/stride decision runs before the 60-240 spm band is checked, so a step-only signal between ~37.5 and ~67 spm is read as a stride and counted double, and only below ~37.5 spm is nothing counted. the old note said everything under 60 spm was dropped, which the code and the 40 spm test both contradict.
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The live strap pedometer under-counted badly. On OxWalk (39 adults, free-living wrist, camera-annotated steps) it had MAPE 33% and read 25% low for anyone who actually walked. One weak footfall reset its confirm run, and its 0.10 g dead-zone dropped gentle walking.
pedometer()now detects gait by stride periodicity (autocorrelation over 4 s windows) and counts steps from the measured cadence. Same signature, and all constants are in seconds.steps_test.dartupdated, and all tests pass.pedometer().Summary by Sourcery
Replace the under-counting peak pedometer with a sample-rate-aware stride-periodicity gait counter.
New Features:
Bug Fixes:
Enhancements:
Documentation:
Tests:
Summary by CodeRabbit