S3D-CNN: skeleton-based 3D consecutive-low-pooling neural network for fall detection

Most existing deep-learning-based fall detection methods use either 2D neural network without considering movement representation sequences, or whole sequences instead of only those in the fall period. These characteristics result in inaccurate extraction of human action features and failure to detect falls due to background interferences or activity representation beyond the fall period. To alleviate these problems, a skeleton-based 3D consecutive-low-pooling neural network (S3D-CNN) for fall detection is proposed in this paper. In the S3D-CNN, an activity feature clustering selector is designed to extract the skeleton representation in depth videos using pose estimation algorithm and form optimized skeleton sequence of fall period. A 3D consecutive-low-pooling (3D-CLP) neural network is proposed to process these representation sequences by improving network in terms of layer number, pooling kernel size, and single input frame number. The proposed method is evaluated on public and self-collected datasets respectively, outperforming the existing methods.