search

xioTechnologies / Gait-Tracking-With-x-IMU

977 stars 418 forks source link

Filter parameters #38

Closed Psomvanshi closed 3 years ago

Psomvanshi commented 3 years ago

Hello, Thank you for the code. Clearly, a lot of work has gone into writing and maintaining this code.

My question is about the filter parameters used in this code. How did you determine the parameters needed to filter the data. For instance, in script.m file:

% HP filter accelerometer data filtCutOff = 0.001;

How did you determine the filtCutoff to be 0.001? Similarly, how the cutoff for the LP filter was determined to be 5 and also the threshold for stationary period detection was 0.05?

xioTechnologies commented 3 years ago

The high-pass filter cut-off frequency was chosen to remove DC content from the accelerometer measurement. The absolute value is then taken from this and put through the low-pass filter. The low-pass filter cut-off frequency and threshold were chosen to smooth the values so that the stationary periods would be reliable framed.