First, the accelerometer and gyroscopes can be operated in various ranges. The sensors can be operated in a variety of modes. Before calibration, the visualization will at best bear superficial resemblence. If the entered data is correct, LP-MOCAP should connect to the individual sensors and in the right half of the windows, visualization should commence.
The entered addresses are remembered between sessions.Īfter entering the addresses of the various sensors, the user can click the Connect button which is near the top of the “Sensors” box. Malformed bluetooth addresses are shown in red, valid addresses in black. After clicking the checkbox to activate this sensor, the bluetooth address can be entered. In Figure 3, an example setting for the hand is shown. It is convenient to write the Bluetooth addresses and the intended uses of the sensor on stickers which are attached to the sensors. The values for each sensor can be found out in our LpmsControl software. Typically, for LPMS IMUs, these have the form 00:04:3e:aa:bb:cc. Each sensor is identified by a bluetooth address which is a string of six pairs of hexadecimal digits, separated by colons. Figure 3 shows the controls for these settings. Additionally, the status of the application is indicated at the bottom of the window.įigure 7 - Arrangement of LPMS-B2 sensors including the hip sensor Software setupīefore recording motion capture data, the motion capture model and the corresponding sensors need to be configured. The window is divided into two main parts: on the left, various configuration and control items are shown on the right, the motion capture result is visualized. Figure 1 shows the application window after starting the application. OverviewĪfter installation, LP-MOCAP can be found in the OpenMAT folder of the Windows Start Menu. This manual will describe the various steps of using the software in detail. Skeleton data is updated at a frequency of 50Hz. LP-MOCAP allows tracking of one arm as well as the head and upper body. Several IMUs are attached to the subject’s body, their relative orientation is determined by a calibration procedure and measurement can begin. Unlike camera-based motion capture systems, no specially equipped measurement site or external hardware is necessary. LP-MOCAP combines data from several IMUs attached to a test subject’s upper body with a skeleton model to derive high-frequency information on the subject’s motion. IMU is shorthand for Inertial Measurement Unit, devices which provide high-frequency updates on their motion. LP-MOCAP is a software package that provides IMU-based upper-body motion capture.
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