4 results about "Distance constraints" patented technology

The present application relates to the technical field of video retrieval, and especially relates to a video space-time quantization range retrieval method and system based on distance constraint. The method comprises the following steps: acquiring video data; performing data preprocessing on the acquired video data; constructing a space-time joint index fusing distance constraint based on the preprocessed data; performing space-time range retrieval based on the constructed space-time joint index fusing distance constraint; and performing object consistency judgment and result output based on the retrieval result. The present application quantitatively represents the fine-grained space-time relationship of video objects in the same video or multiple videos, converts the space-time sensitive video data query semantics into accurate quantitative range queries in the time and space dimensions of the video objects, i.e. the spatial range queries among the same intra-frame video objects and the continuous time length range queries on the continuous video frames.

The present invention discloses a geographical point matching method based on frequency constraint and triangle principle, belonging to the field of geographical information processing. It includes: obtaining a set of geographical points to be matched and a set of basic geographical points; calculating the topological structure; calculating the topological structure with distance constraint; finding the most similar candidate triangle descriptors of each triangle descriptor in the topological structure of the set of geographical points to be matched in the topological structure of the set of basic geographical points; obtaining all sets of basic geographical points, and counting the frequency of occurrence of each geographical point; screening out the sets of basic geographical points greater than the frequency threshold; forming a new descriptor set; counting all the basic geographical points included in the descriptor set to obtain the point set successfully matched with the set of geographical points to be matched. The present invention makes full use of the spatial position distribution relationship of geographical points, combines the topological structure characteristics of the set of points to be matched, and adopts multi-attribute constraints to improve the reliability of matching, and is applicable to matching local geographical points from a large number of geographical points.

The application provides a distributed dynamic positioning method based on distance constraint, uses local information and target constraint, constructs an estimator based on local consensus on each sensor; combines real-time information under distance constraint, adopts an alternating multiplier method to realize real-time single-target tracking under only distance constraint, and realizes fast and accurate single-target tracking.

The invention relates to the technical field of video retrieval, in particular to a video space-time quantization range retrieval method and system based on distance constraint. The method comprises the following steps: acquiring video data; performing data preprocessing on the video data obtained by the data acquisition; constructing a space-time joint index fused with distance constraints based on the preprocessed data; performing spatio-temporal range retrieval based on the constructed spatio-temporal joint index fused with the distance constraint; and performing object consistency judgment and result output based on a retrieval result. According to the method, the fine-grained time-space relationship of the video objects in the same video or multiple videos is quantitatively expressed, and the time-space sensitive video data query semantics is converted into accurate and quantitative range query of the video objects in two dimensions of time and space; the query includes space range query between video objects in the same frame and continuous duration range query on continuous video frames.