MATLAB code

Introduction

Training Technology Lab uses MATLAB for most data processing and visualization purposes. Several scripts have been written to work with our various technology.
Here is a list of the projects:

• Rosbag extraction
• EMG analyzer
• Bluetooth force sensor
• RTL MATLAB control
• BFR audio

Rosbag extraction

rosbag_video.m example - using two webcam feeds.

Official methods:
Viewing: For viewing video stored in a .bag file, rqt_bag is the standard tool.

Extraction: To extract video (which are just compressed/uncompressed images) several methods exist. We have often used bag2video.

MATLAB scripts:

rosbag_loader.m Converts .bag files into .mat files. Must be done before using the other 2 scripts

rosbag_plotter.m Automatically plots known data formats)

rosbag_video.m Automatically converts rosbags into .avi files with data plot overlays.
It can use single or dual videos and plot up to 4 data sets.

Usage:

1. Make a new folder with the same name as the ROSBAG-file you intend to analyze.
2. Paste in the ROSBAG-file and a copy of rosbag_loader.m(which can be found in one of the other folders)
3. Run rosbag_loader and chosse the desired .bag file. This will save the data as a workspace file in the new folder
4. Run rosbag_plotter/rosbag_video and choose the desired .m file, to plot the data.

EMG analyzer

For analyzing EMG data recorded with Myon electrodes and ADInstruments AD converter via ROS-setup in Training Technology Lab

ROS MATLAB control

An initial attempt to control the RTL from MATLAB. The idea was to make programming the RTL and make data acquisition easier for Veltek students. A MATLAB GUI was supposed to be the interface. This project is not finished.

BFR audio

A simple test script for listening to sound from arteries during blood flow restriction exercise.

FAQ/Debugging

This sections relates to all common problems with the software.