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.

StereoBox: a robust and efficient solution for automotive short-range obstacle detection

Abstract: This paper presents a robust method for close-range obstacle detection with arbitrarily aligned stereo cameras. System calibration is performed by means of a dense grid to remove perspective and lens distortion after a direct mapping between image pixels and world points. Obstacle detection is based on the differences between left and right images after transformation phase and with a polar histogram, it is possible to detect vertical structures and to reject noise and small objects. Found objects' world coordinates are transmitted via CAN bus; the driver can also be warned through an audio interface. The proposed algorithm can be useful in different automotive applications, requiring real-time segmentation without any assumption on background. Experimental results proved the system to be robust in several envitonmental conditions. In particular, the system has been tested to investigate presence of obstacles in blind spot areas around heavy goods vehicles (HGVs) and has been mounted on three different prototypes at different heights.

Double Phase Implicit Obstacle Problems with Convection and Multivalued Mixed Boundary Value Conditions

Abstract: In this paper we consider a mixed boundary value problem with a nonhomogeneous, nonlinear differential operator (called a double phase operator), a nonlinear convection term (a reaction term depending on the gradient), three multivalued terms, and an implicit obstacle constraint. Under very general assumptions on the data, we prove that the solution set of such an implicit obstacle problem is nonempty (so there is at least one solution) and weakly compact. The proof of our main result uses the Kakutani-Ky Fan fixed point theorem for multivalued operators along with the theory of nonsmooth analysis and variational methods for pseudomonotone operators.

System for displaying views of vehicle and its surroundings

Abstract: The present invention provides a system for displaying views of a vehicle and its surroundings. Preferably, the system for displaying views of a vehicle and its surroundings includes one or more cameras for photographing a vehicle and its surroundings, obstacle detection means for detecting an obstacle outside the vehicle, a memory unit for previously storing alternative views corresponding to the obstacle, and a view processing unit for creating a bird's eye view from a virtual viewpoint outside the vehicle based on views acquired by the cameras. When the obstacle detection means detects the obstacle, the view processing unit secures the obstacle, selects an alternative view corresponding to the secured obstacle, reads the alternative view from the memory unit, changes a direction and inclination of the selected alternative view in line with the virtual viewpoint, and then overlaps the changed alternative view on the bird's eye view.

Humanoid robot with collision avoidance and trajectory recovery capabilities

Abstract: The invention relates to a humanoid robot which can move on its lower limb to execute a trajectory. According to the invention, the robot is capable of detecting intrusion of obstacles in a safety zone defined around its body as a function of its speed. Preferably when the robot executes a predefined trajectory, for instance a part of a choreography, the robot which avoids collision with an obstacle will rejoin its original trajectory after avoidance of the obstacle. Rejoining trajectory and speed of the robot are adapted so that it is resynchronized with the initial trajectory. Advantageously, the speed of the joints of the upper members of the robot is adapted in case the distance with an obstacle decreases below a preset minimum. Also, the joints are stopped in case a collision of the upper members with the obstacle is predicted.