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                <term xml:lang="en">UAV (Unmanned Aerial Vehicle)</term>
                <term xml:lang="en">Safety-Nets</term>
                <term xml:lang="en">Safety-Nets UAV (Unmanned Aerial Vehicle) Optic Flow Autonomous exploration multirotors</term>
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                <term xml:lang="en">Autonomous Navigation</term>
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                <term xml:lang="en">Safety-Nets UAV's Optic Flow Autonomous Navigation Exploration</term>
                <term xml:lang="en">multirotors</term>
                <term xml:lang="en">Autonomous exploration</term>
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              <p>Web-like obstacles, such as safety nets, represent a unique hazard for drones, and especially UAVs (Unmanned Aerial Vehicles). Fencing and netting are particularly difficult to distinguish from the background using either computer vision, lidar and sonar. In contrast, animals such as flying insects may detect these web-like obstacles using Optic Flow (OF), and more precisely motion  parallax. A netting-avoidance solution was proposed using a OF-based detection method. The nettingdetection method was based on a signature defined by the shape of the OF magnitude across the visual field. We established that the OF shape depends on the orientation of the netting in relation to the hexarotor’s movement.This paper demonstrates netting detection in real-world experiments, according to any direction flight made by the UAV along the net. The proposed NOWA method (which stands for Netting Optical-floW-based distinction Algorithm) separates the OF signatures belonging to these different surfaces -netting or background- whatever their orientations. By extracting the OF signatures of these different surfaces and separating them, the proposed visual method can estimate their relative locations and orientations. In a robotic simulations, the multirotor explores and navigates automatically using this netting detection method, using saccades to avoid obstacles. In the simulations, these saccades are also used to simplify netting detection by orienting itself systematically parallel to these planes, a behavior reminiscent of flying insects.</p>
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