86 results about "Path expression" patented technology
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In query languages, path expressions identify an object by describing how to navigate to it in some graph (possibly implicit) of objects. For example, the path expression p.Manager.Home.City might refer the city of residence of someone's manager. Path expressions have been extended to support regular expression-like flexibility. XPath is an example of a path expression language.
The invention relates to a universal road and lane detectionsystem and method. The method comprises: S300, interference elimination and image artifact and irrelevant image part removing are carried out on an input image to obtain a relevant image; S302, lane edge feature or road edge feature is extracted from the relevant image; S304, according to the lane edge feature or road edge feature, fitting is carried out to obtain a synthesized path expression model; S306, the path expression model is tracked to carry out time sequence consistency integration or position consistency integration; and S308, the path expression model corresponds to a global coordinate system. On the basis of the module design, pretreatment is carried out on the image inputted by the camera, the interested relevant image is selected; lane detection or road detection is carried out by combining input information of the laserradar; model fitting is carried out to estimate a road path and the accuracy of path estimation is improved by using the time sequence integration module; and then the image corresponds to the global coordinate system in real time by using a coordinate system correspondence module to improving path estimation accuracy. Therefore, a problem that the existing road estimation model has imperfect functions can be solved.
A system and method is provided for query processing comprises: creating an index of a database and ordering a set of index candidates from the index into a list based on a set of heuristic rules. A query defining a query path is then reduced into a list of single path expressions. Each index candidate is matched against the list of single path expressions according to the ordering of the index candidates. The matched candidate nodes are also verified to insure that they satisfy the query path.
The application discloses a method for retrieving node data in a graphic database, and the method comprises the following steps: defining a path description relation between nodes in the graphic database; getting a source node which needs to perform data retrieval and a target node related with the source node; determining a path expression of a path where the source node and the target node are located according to the path description relation; and sequentially performing the data retrieval on the source node, the target node and related nodes between the source node and the target node in the path expression. In the method for retrieving the node data in the graphic database, data information of the source node and the other nodes related with the source node can be directly got by determining the path expression of the path at which the node needing the retrieval in the graphic database is located and sequentially performing the data retrieval on all the nodes contained in the path expression.