Can the Kinect™ sensors be used for motion analysis?

The Kinect sensor offers new perspectives for the development and application of affordable, portable and easy-to-use markerless motion capture (MMC) technology. However, at the moment, accuracy of this device is still not known. In this study we compare results from Kinect (MMC) with those of a stereophotogrammetric system (marker based system). 27 subjects performed a deep squatting motion. Parameters studied were segments lengths and joint angles. Results varied significantly depending on the joint or segment analyzed. For segment length MMC shows poor results when subjects were performing movement. Differences were also found concerning some joint angles but for major joints involved during squatting (shoulder, hip and knee) no difference was found.

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