Issues and Challenges in Various Sensor-Based Modalities in Human Activity Recognition System

The population of aged people has been increasing globally due to various factors like life expectancy and declining birth rates. So, there is a reduction in physical or cognitive decline, which affects the quality of life of the people where people compromise comfort. It is essential to bring the technology to assist the elderly, which helps them to serve effectively in terms of cost and reliability. As the technologies are more accessible in terms of price, size and speed, these can be adapted to assist the people. Human activity recognition (HAR) system plays a vital role in understanding human actions to assist such people. In this work, we carry out an extensive survey on research in the field of HAR. We propose a review, based on the various sensory modalities used in the HAR system. Along with this, the issues and challenges faced by the various sensor-based HAR are listed.