A Similarity Preserving Cross-modal Hash Retrieval Method

A similarity and cross-modal technology, applied in the field of similarity-preserving cross-modal hash retrieval, can solve the problems of insufficient reduction of redundant information in hash coding and insufficient similarity preservation, etc., and achieve strong identification and performance Enhanced effect

Active Publication Date: 2021-11-26
JIUJIANG UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to provide a similarity-preserving cross-modal hash retrieval method, which solves the problem that many existing methods do not fully preserve the similarity of samples within and between modalities, and that each The problem of insufficient reduction of redundant information on the bit makes the learned hash code have good discrimination ability

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[0034] A similarity-preserving cross-modal hash retrieval approach, assuming n objects The features in image modal and text modal are respectively with Among them, d 1 and d 2 denote the dimensions of image modality and text modality feature vectors, respectively, with Represent the characteristics of the i-th object in the image mode and text mode respectively; at the same time, it is assumed that the feature vectors of the image mode and text mode are preprocessed by zero centralization, that is, satisfy Assume that the label matrix formed by the category labels of n objects is L=[l 1 , l 2 ,...,l n ]∈{0,1} m×n , where l i (i=1,2,...,n) represents the category label information of the i-th object, m is the number of categories; assuming that the cross-modal similarity matrix is ​​S, its element S ij Indicates the similarity between the i-th sample in the image modality and the j-th sample in the text modality; if the i-th sample in the image modality is simil...

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Abstract

A similarity-preserving cross-modal hash retrieval method, which includes the following steps: (1) constructing an objective function based on a similarity-preserving strategy; (2) solving the objective function; (3) generating query samples and retrieving sample sets (4) Calculate the Hamming distance from the query sample to each sample in the retrieval sample set; (5) Use the cross-modal retriever to complete the retrieval of the query sample. The method of the present invention can not only fully retain the similarity of samples between modals, but also fully retain the similarity of samples in a modal when performing hash learning, so that the learned Hamming space has stronger discrimination ability and more Facilitate the completion of cross-modal retrieval.

Description

technical field [0001] The invention relates to a similarity preserving cross-modal hash retrieval method. Background technique [0002] In all walks of life in today's society, a large number of users have accumulated massive amounts of user data (for example, the search engine Chrome has more than 100PB of data), and the amount of data is still growing exponentially, and the era of big data is coming. Big data plays a very important role in Internet finance, medical care, education, military and transportation industries. For example, combining big data with machine learning technology can provide reliable basis for financial investment and market decision-making. Today's big data has the following characteristics: (1) large volume, the data volume is in PB; (2) high dimensionality, data features have thousands of dimensions; (3) many modes, many types of data, and various forms , including images, text, audio and video. These characteristics of big data have brought ser...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F16/33
Inventor 董西伟杨茂保孙丽董小刚尧时茂王玉伟邓安远邓长寿
Owner JIUJIANG UNIV
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