Metni and Hamel [19] investigated the usability of UAV systems for
the monitoring andmaintenance of bridges and structures and presented
a novel control law of a UAV under some practical restrictionswhich
are based on computer vision. Rathinam et al. [20] addressed the problem
of autonomous UAV-based monitoring of linear structures such as
pipelines, roads, bridges, canals, and power generation grids. A closedloop
control algorithm was developed for detecting linear structures
locally using visual recognition techniques in real-time.