Abstract
Suppose I want an estimate of the number of steps I have taken. I have an accelerometer so I can have data on changes in acceleration over time. Given such data, how might I estimate the number of steps I have taken while the data was being collected? We attempt to solve such a challenge. We implement an algorithm by Jimenez et al. (2009).
Input
The expected input is a CSV (Comma-separated values) file. Semantically speaking, the file contains readings from an accelerometer. Each line in the file corresponds to a set of three readings, one each in the x-axis, y-axis and z-axis.
The following is an example of a CSV file with 5 sets of readings:
-2.35,0.39,9.12
-1.86,0.29,8.63
-1.77,0.49,8.73
-1.67,0.88,9.02
-1.37,1.08,9.02
Output
The expected output of the program is an estimate of the number of steps (as in walking) that have been taken while readings were collected from the accelerometer.
Usage
I provide instructions to compile and run the program, on a *nix system.
I assume you have the executables git, java and javac.
Let path/to/csv represent the location of the CSV-file (ie. input).
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Obtain a copy of the program. For example, on your computer, you can run the following command: git clone https://gitlab.com/phtan/counting-with-jimenez.git
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navigate to the directory that has CountStep.java
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run the following command, including the full-stop (or period): javac -d . CountStep.java
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run: java ZerothPackage.CountStep
path/to/csv
Licence
All may obtain a copy of this program, under the MIT licence. A copy of the licence has been included with this program.
Reference(s)
- A. R. Jiménez et al. The year 2009. 'A comparison of pedestrian dead-reckoning algorithms using a low-cost MEMS IMU'. Related to 6th IEEE International Symposium on Intelligent Signal Processing.