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Large-scale image retrieval method

An image retrieval, large-scale technology for character and pattern recognition, special data processing applications, instrumentation, etc.

Active Publication Date: 2014-10-22
NANJING UNIV
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: In order to solve the problems in the prior art, the present invention proposes a large-scale image retrieval method, thereby effectively solving the problem of fast and accurate encoding and retrieval of image features under large-scale data

Method used

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Experimental program
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Embodiment

[0145] This embodiment includes the following parts:

[0146] 1. Image feature extraction

[0147] In this embodiment, the public image data set CIFAR-10 is used to learn a hash function, encode image features, and then perform retrieval. Specifically, for each image in CIFAR-10, an original image pixel gray value feature is extracted: first, the gray level images of all images are obtained through color space conversion, and the gray value of each gray level image is divided into rows Splicing to obtain image features, each image is represented by an image feature, and each image feature is a vector.

[0148] 2. Hash function projection vector learning:

[0149] CIFAR-10 has a total of 10 categories, and 100 image features are randomly selected from each category to form an image feature training set, with a total of 1000 image features.

[0150] Then, learn the hash function projection vector for each category. Taking the first category as an example, it is divided into t...

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Abstract

The invention discloses a large-scale image retrieval method. The method comprises the steps of image feature extraction, Hash function projection vector learning, Hash function offset learning, image feature dimensionality reduction, image feature encoding and image retrieval. By adopting the method, a large scale of images can be retrieved rapidly. Firstly, the discrimination among codes is enhanced by learning a discriminant Hash function, thereby better distinguishing different types of image features; secondly, the image features are subjected to dimensionality reduction and encoding by using a Hash function, thereby lowering the storage demand of the image features and the computation overhead of a retrieving process. By adopting the large-scale image retrieval method, large-scale image retrieving is realized efficiently and accurately, thereby achieving a high application valve.

Description

technical field [0001] The invention belongs to the field of computer image retrieval, in particular to a large-scale image retrieval method. Background technique [0002] With the rapid development of the Internet, various network resources are increasingly abundant, and the scale of network data is also growing exponentially. Among the various types of data on the Internet, images account for the majority, and have reached a massive scale: in 2010, the total number of images counted by the famous website Flickr exceeded 5 billion. Such data continues to grow at an alarming rate, and will reach an unimaginable scale in a few years. Undoubtedly, it is very important to quickly and accurately search the data needed by users from such a large database, but there are also huge difficulties. For example, given an image, how to quickly and accurately search for images similar to the given image in a large-scale database is a hot research topic at present. However, there are oft...

Claims

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Application Information

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IPC IPC(8): G06F17/30
CPCG06F16/5838G06F18/21
Inventor 杨育彬毛晓蛟
Owner NANJING UNIV
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