MeasurementMetric Class
The MeasurementMetric class is designed to quantify the difference between two Measurement objects. This is particularly useful for comparing a recorded movement against a reference movement.
__init__(self, first, second)
first(Measurement): The first measurement to compare.second(Measurement): The second measurement to compare.
Properties
The class provides several properties that calculate different aspects of the difference between the two measurements:
alpha_metric: The sum of absolute differences between thealphaangles.beta_metric: The sum of absolute differences between thebetaangles.orientation_metric: The sum of absolute differences between the normalized accelerometer vectors.lateral_metric: The absolute difference in the lateral component of the orientation.sagital_metric: The absolute difference in the sagittal component of the orientation.forward_metric: A measure of how much the first measurement is bent forward compared to the second.backward_metric: A measure of how much the first measurement is bent backward compared to the second.metric: A composite metric that combines thealpha,beta, andorientationmetrics into a single value.
Usage Example
from flexlib.models.flex_reader import FlexReader
from flexlib.models.measurement_metric import MeasurementMetric
# Load two recordings to compare
recording1 = FlexReader.parse('recording1.csv')
recording2 = FlexReader.parse('recording2.csv')
# Compare the first measurement of each recording
metric = MeasurementMetric(recording1.measurements[0], recording2.measurements[0])
print(f"Overall difference metric: {metric.metric}")
print(f"Difference in alpha angles: {metric.alpha_metric}")
# You can iterate through two recordings and compare them frame by frame
total_diff = 0
for m1, m2 in zip(recording1.measurements, recording2.measurements):
total_diff += MeasurementMetric(m1, m2).metric
print(f"Total difference over recordings: {total_diff}")