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Introduction to accelerometry

Accelerometry is a technique for capturing motion using inertial sensors. In this video, Victor and Alexander talk about accelerometry. They try to answer questions like: What is an accelerometer? What …

Feature extraction

Several features can be extracted from a video file. What is a video file? Let us start by understanding more about what a video file contains. Find a video file …

Visualising video

This article presents a set of video-based visualisation techniques developed for the analysis of music-related body motion. Here in Music Moves, we present several different types of motion capture technologies. …

Video analysis

Video analysis is the most accessible and easy solution to get started with analysing human motion on a computer. In this video, Alexander talks about how one can record video …

Understanding post-processing

Although optical, infrared motion capture systems provide high-quality data in both the spatial and temporal domains, they will most likely include noise and tracking error. In this article, you will …

Creating skeletons and rigid bodies

Sometimes, it is useful to group your markersets into skeletons (for human bodies) or rigid bodies (for inflexible objects). In this video, Laura and Mari explain how skeletons and rigid …

Marker labelling

Once you have recorded a capture session, the first step in post-processing is to label the recorded markers. This involves assigning a meaningful name to each marker. It also involves …

Understanding the calibration process

The calibration routine is done to establish a 3D reference for the cameras in a motion capture system. It effectively “links” them to the real world and each other. All …

Calibration demonstration

Calibration allows an infrared motion capture system to establish the distances between cameras and the distance between cameras and the floor. It also establishes the origin of the capture volume. …

Capturing bodies with passive markers

Data acquisition with infrared motion capture is traditionally implemented using special markers attached to the object of interest. Markers are usually attached to the subject’s body using tape or glue …

Choosing appropriate marker placements

Markers have to be placed carefully on moving bodies to ensure that motion is captured effectively. How do you decide where to place your markers? What marker sizes should you …

How does an infrared motion capture system work?

An infrared motion capture system works by estimating the three-dimensional (3D) positions of reflective markers using the two-dimensional (2D) view from multiple cameras. In this article, we will go through …

Choosing an appropriate camera arrangement

When planning a new motion capture session, it is important to consider how to place your cameras. Sometimes a creative camera arrangement is necessary to capture all of your markers …

Introduction to infrared motion capture

In this video, Laura and Mari introduce you to infrared (IR) motion capture. What does an IR motion capture lab look like? How does IR motion capture work? IR motion …