Method and system for retrieving multimedia information based on bit vector

Abstract

The invention discloses a method and system for retrieving multimedia information based on a bit vector. The method comprises the steps that the characteristic data of the current multimedia information are extracted to obtain the n-dimensional high-dimensional characteristic vector of the current multi-media information; the n-dimensional high-dimensional characteristic vector is converted through a projection matrix to obtain an m-dimensional middle vector; all the elements of an m-dimensional threshold vector are compared with the corresponding elements of the middle vector respectively, and binaryzation is carried out on the middle vector according to a comparison result to obtain the m-dimensional bit vector of the current multimedia information; m is smaller than n; according to the obtained bit vector, a bit vector similar to the bit vector is searched for in a multimedia characteristic database, and the multimedia information corresponding to the found bit vector is used for being output as a retrieved result. The method ensures original vector identification capacity, and after the high-dimensional characteristic vector of the multimedia information is mapped into a low-dimensional bit vector, the retrieval efficiency based on the bit vector is higher, and the retrieval loss based on the bit vector is smaller.

Description

technical field [0001] The invention relates to the field of computers, in particular to a multimedia information retrieval method and system based on bit vectors. Background technique [0002] In recent years, with the rapid development of multimedia technology and computer technology, large-scale multimedia information appears more and more in many research and application fields. In order to effectively access and utilize the information contained in these huge and complex data, the traditional text-based retrieval technology has been unable to meet the growing needs of users, and the content-based retrieval technology has emerged as the times require. [0003] The content-based retrieval method needs to extract the characteristic data of multimedia to establish a characteristic database, and then convert the retrieval of multimedia information into the neighbor retrieval of characteristic data. For large-scale multimedia information, its feature data is also large-scale...

AI Technical Summary

Problems solved by technology

However, the methods in the prior art tend to cause similar high-dimensional feature vectors (that is, similar high-dimensional feature vectors) to be mapped to dissimilar bit vectors, and dissimilar high-dimensional feature vectors (that is, non-similar high-dimensional feature vec

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