A Novel Semantics-Preserving Hashing for Fine-Grained Image Retrieval

Han Sun*, Yejia Fan, Jiaquan Shen, Ningzhong Liu, Dong Liang, Huiyu Zhou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


With the advent of the era of big data, the storage and retrieval of data have become a research hotspot. Hashing methods that transform high-dimensional data into compact binary codes have received increasing attention. Recently, with the successful application of convolutional neural networks in computer vision, deep hashing methods utilize an end-to-end framework to learn feature representations and hash codes mutually, which achieve better retrieval performance than conventional hashing methods. However, deep hashing methods still face some challenges in image retrieval. Firstly, most existing deep hashing methods preserve similarity between original data space and hash coding space using loss functions with high time complexity, which cannot get a win-win situation in time and accuracy. Secondly, few existing deep hashing methods are designed for fine-grained image retrieval, which is necessary in practice. In this study, we propose a novel semantics-preserving hashing method which solves the above problems. We add a hash layer before the classification layer as a feature switch layer to guide the classification. At the same time, we replace the complicated loss with the simple classification loss, combining with quantization loss and bit balance loss to generate high-quality hash codes. Besides, we incorporate feature extractor designed for fine-grained image classification into our network for better representation learning. The results on three widely-used fine-grained image datasets show that our method is superior to other state-of-the-art image retrieval methods.

Original languageEnglish
Article number8974217
Pages (from-to)26199-26209
Number of pages11
JournalIEEE Access
Publication statusPublished - 29 Jan 2020
Externally publishedYes

Bibliographical note

Funding Information:
This work was supported by the Fundamental Research Funds for the Central Universities under Grant NS2016091.

Publisher Copyright:
© 2013 IEEE.

Copyright 2020 Elsevier B.V., All rights reserved.


  • Deep hashing
  • feature switch layer
  • fine-grained images
  • image retrieval

ASJC Scopus subject areas

  • Computer Science(all)
  • Materials Science(all)
  • Engineering(all)


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