More Potential Applications Via High-Order Motion

There have been a few acceleration studies focusing on abnormal behaviour detection. Chen et al. (2015) applied acceleration flow to detect abnormal behaviours. Dong et al. (2016) fed optical flow and acceleration flow into a network, both in combination and individually, to detect the violence in scenes. The evaluation in their work illustrates that the most reliable feature is individual acceleration flow. When people fight, their bodies tend to have large acceleration (in many places and with large magnitudes) because their arms are swinging and their feet are kicking. As such, acceleration appears more suited to the detection of rapid changes, consistent with scenes of violence. In the scenes which do not contain episodes of violence there is only little acceleration. In comparison there is more optical flow, or velocity flow, with more leisurely movement. Thus, acceleration field might be able to determine an approach suited to the detection of violent crime in the future.