Figure 1
From: Design and implementation of a distributed fall detection system based on wireless sensor networks
The sample images and their corresponding optical flow images. The first row of each sub-figure is the original images, and the second row is the corresponding optical flow images: (a) walking; (b) sitting down; (c) standing up; (d) jogging; (e) falling. Further, we divided the monitored region into 4 sub-regions, and aggregated the horizontal vector magnitude of these regions as the human cross these regions, as shown in Figure 2.