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4184 results about "Line segment" patented technology

In geometry, a line segment is a part of a line that is bounded by two distinct end points, and contains every point on the line between its endpoints. A closed line segment includes both endpoints, while an open line segment excludes both endpoints; a half-open line segment includes exactly one of the endpoints.

Method and apparatus for linking a video segment to another segment or information source

A given video segment is configured to include links to one or more other video segments or information sources. The given video segment is processed in a video processing system to determine an association between an object, entity, characterization or other feature of the segment and at least one additional information source containing the same feature. The association is then utilized to access information from the additional information source, such that the accessed information can be displayed to a user in conjunction with or in place of the original video segment. A set of associations for the video segment can be stored in a database or other memory of the processing system, or incorporated into the video segment itself, e.g., in a transport stream of the video segment. The additional information source may be, e.g., an additional video segment which includes the designated feature, or a source of audio, text or other information containing the designated feature. The feature may be a video feature extracted from a frame of the video segment, e.g., an identification of a particular face, scene, event or object in the frame, an audio feature such as a music signature extraction, a speaker identification, or a transcript extraction, or a textual feature. The invention allows a user to access information by clicking on or otherwise selecting an object or other feature in a displayed video segment, thereby facilitating the retrieval of information related to that segment.
Owner:KONINKLIJKE PHILIPS ELECTRONICS NV

Concave convex mixed complex polygon farmland unmanned aerial vehicle spraying operation flight path planning method

The invention discloses a concave convex mixed complex polygon farmland unmanned aerial vehicle spraying operation flight path planning method. Starting from any feature point on the boundary of the polygon farmland, all feature points of the boundary of the polygon farmland are acquired sequentially, adjacent two points are connected by using a straight line sequentially according to the point acquisition sequence of the feature points, and an operation region of the boundary of the polygon farmland is generated; the longest edge of the boundary of the operation region is found out; a feature point farthest from the longest edge is found out; N flight path lines are drawn between the longest edge and the feature point farthest from the longest edge; coordinates of all boundary line segments crossed with the flight path lines and flight path line crossed points are obtained; the number of the crossed points between the flight path lines and the boundary line segments is judged, and when the number of the crossed points is larger than 2, flight path lines outside the operation region range are deleted; and starting from a flight path line nearest to the longest edge, the flight path lines and side flight lines are connected in sequence, and an S-shaped flight path planning line is obtained. The flight path of the concave convex mixed complex polygon farmland unmanned aerial vehicle spraying operation can be planned.
Owner:CENT SOUTH UNIV

A three-dimensional wire frame structure method and system fusing a binocular camera and IMU positioning

The invention relates to a three-dimensional wire frame structure method and system fusing a binocular camera and IMU positioning. On the basis of binocular vision, the invention initializes and fusesinertial measurement information by using a divide-and-conquer strategy, implements tracking, positioning and drawing, and can robustly run in indoor and outdoor environments and complex motion conditions. On the basis of accurate positioning, 3D wireframe reconstruction and iterative optimization are carried out based on the posture of the key frame. Linear segments are matched by local featuresand spatial geometric constraints and back-projected into three-dimensional space. Through the angle and distance constraints, the straight line segments are divided into different sets. Based on thegrouping results, the fitting region is determined and the straight line segments are merged. Finally, a 3-D wireframe structure is output. The invention fuses multi-source information to improve thestability and robustness of the system on the traditional vision-based positioning and mapping method. At the same time, line information is added to the key frame to sparsely express the structuralcharacteristics of the three-dimensional environment, which improves the computational efficiency.
Owner:WUHAN UNIV
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