I. Introduction
Currently, with the advancement of CMOS sensor and wireless communication technologies, camera sensors networks (CSNs) have witnessed a vigorous development. As a derivative of wireless sensor networks (WSNs) and an important part of Internet of Things, a typical camera sensor networks consists of a great number of camera sensors with limited sensing region and adjustable sensing orientations. It can capture rich information from the environment in the form of images or videos. Moreover, due to the widespread applications of CSNs, including smart cities, industrial monitoring, target recognition, intrusion monitoring, smart agriculture, and surveillance security [1], [2], [3], [4], [5], [6], [7], [8], it has attracted extensive attention from scholars.