Human Activity Recognition Technology Based on Sliding Window and Convolutional Neural Network

Abstract

Due to the lack of unified human activity model and related specifications, the existing wearable human activity recognition technology uses different types, numbers and deployment locations of sensors, and affects its promotion and application. Based on the analysis of human activity skeleton characteristics and human activity mechanics, a human activity model based on Cartesian coordinates is established and the normalization method of activity sensor deployment location and activity data in the model is standardized; Secondly, a sliding window technique is introduced to establish a mapping method to convert human activity data into RGB bitmap, and a Convolutional Neural Network is designed for Human Activity Recognition (HAR-CNN); Finally, a HAR-CNN instance is created and experimentally tested based on the public human activity dataset Opportunity. The experimental results show that HAR-CNN achieves the F1 values of 90% and 92% for periodic repetitive activity and discrete human activity recognition, respectively, while the algorithm has good operational efficiency.