Topic
Obstacle
About: Obstacle is a research topic. Over the lifetime, 9517 publications have been published within this topic receiving 94760 citations. The topic is also known as: impediment & barrier.
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Patent•
14 May 2014
TL;DR: In this paper, the authors proposed a standby method and system for mobile terminals, which comprises the steps that whether an obstacle exists in front of a screen or not is detected through a range sensor, a camera is started to acquire images of the obstacle if the obstacle exists, whether parts of a human face are recognized in the images of an obstacle or not, and if the parts of the human face were not recognized by the obstacle, the camera and a screen backlight are closed to enter a standby state.
Abstract: The invention belongs to the field of mobile terminals, and provides a standby method and system. The standby method comprises the steps that whether an obstacle exists in front of a screen or not is detected through a range sensor, a camera is started to acquire images of the obstacle if the obstacle exists, whether parts of a human face are recognized in the images of the obstacle or not is judged, and if the parts of the human face are not recognized in the images of the obstacle, the camera and a screen backlight are closed to enter a standby state. According to the standby method and system, the screen can turn black automatically when a user does not watch the screen, electric quantity can be saved, and standby time can be effectively prolonged. Furthermore, due to the fact that the camera is started to acquire the images of the obstacle only when the range sensor detects the existence of the obstacle in front of the screen, the time for starting the camera can be reduced to the maximum extent, and power consumption can be lowered.
24 citations
Patent•
[...]
27 Dec 1995
TL;DR: In this article, a drive assist system consisting of an approach detection unit detecting an obstacle within a set distance, a behavior control unit 73 forcibly braking an own vehicle if the approach detector detects the obstacle, and an arrangement storage unit 66 storing a previous picked-up image picked up around a target parking area, was used to detect the presence of a steady obstacle even if the steady obstacle is present and the driver inevitably approached the obstacle whenever parking or starting a vehicle around a parking area.
Abstract: PROBLEM TO BE SOLVED: To suppress annoyance of a driver by providing a drive assist system automatically controlling notification and a vehicle behavior in response to the presence of a steady obstacle even if the steady obstacle is present and the driver inevitably approaches the obstacle whenever parking or starting a vehicle around a parking area.SOLUTION: A drive assist system comprises: an approach detection unit 71 detecting an obstacle within a set distance; a behavior control unit 73 forcibly braking an own vehicle if the approach detection unit 71 detects the obstacle; an arrangement storage unit 66 storing therein a previous picked-up image picked up around a target parking area; a picked-up-image acquisition unit 61 acquiring a current picked-up image picked up around the target parking area at a time of parking the vehicle in the target parking area or leaving the target parking area; and an obstacle identification unit 70 identifying a nonsteady obstacle around the target parking area on the basis of a difference between the previous picked-up image stored in the arrangement storage unit 66 and the current picked-up image acquired by the picked-up-image acquisition unit 61, the approach detection unit 71 setting the set distance for a steady obstacle smaller than the set distance for the nonsteady obstacle.
24 citations
TL;DR: The paper proposes a motion planner based on a variation of a Probabilistic Road Map that does not rule out the samples implying collisions with removable objects but instead classifies them according to the collided obstacle(s), and allows the search of free paths with the indication of which objects must be removed from the work-space to make the path actually valid.
24 citations
Patent•
07 Mar 1941
TL;DR: In this paper, the authors proposed a radio direction finder that can give instantaneous indications of directions without the use of any rotating element for the purpose of finding the direction of a target.
Abstract: The present invention relates to direction finding systems and particularly to radiogoniometers and obstacle radio localizing apparatus. An object of the invention is to provide radio direction finders giving instantaneous indications of directions without the use of any rotating element for...
24 citations
TL;DR: This article proposes a novel autonomous path planning algorithm based on a tangent intersection and target guidance strategy (APPATT), which can generate satisfactory collision-free paths under uncertain environments in a nearly real-time manner.
Abstract: Unmanned aerial vehicle (UAV) path planning enables UAVs to avoid obstacles and reach the target efficiently. To generate high-quality paths without obstacle collision for UAVs, this article proposes a novel autonomous path planning algorithm based on a tangent intersection and target guidance strategy (APPATT). Guided by a target, the elliptic tangent graph method is used to generate two sub-paths, one of which is selected based on heuristic rules when confronting an obstacle. The UAV flies along the selected sub-path and repeatedly adjusts its flight path to avoid obstacles through this way until the collision-free path extends to the target. Considering the UAV kinematic constraints, the cubic B-spline curve is employed to smooth the waypoints for obtaining a feasible path. Compared with A*, PRM, RRT and VFH, the experimental results show that APPATT can generate the shortest collision-free path within 0.05 seconds for each instance under static environments. Moreover, compared with VFH and RRTRW, APPATT can generate satisfactory collision-free paths under uncertain environments in a nearly real-time manner. It is worth noting that APPATT has the capability of escaping from simple traps within a reasonable time.
24 citations