Open Access

ARTICLE

Image Retrieval Based on Deep Feature Extraction and Reduction with Improved CNN and PCA

Rongyu Chen, Lili Pan^*, Yan Zhou, Qianhui Lei

Central South University of Forestry and Technology, Changsha, 410000, China

* Corresponding Author: Lili Pan. Email:

Journal of Information Hiding and Privacy Protection 2020, 2(2), 67-76. https://doi.org/10.32604/jihpp.2020.010472

Received 01 July 2020; Accepted 28 July 2020; Issue published 11 November 2020

Abstract

With the rapid development of information technology, the speed and efficiency of image retrieval are increasingly required in many fields, and a compelling image retrieval method is critical for the development of information. Feature extraction based on deep learning has become dominant in image retrieval due to their discrimination more complete, information more complementary and higher precision. However, the high-dimension deep features extracted by CNNs (convolutional neural networks) limits the retrieval efficiency and makes it difficult to satisfy the requirements of existing image retrieval. To solving this problem, the high-dimension feature reduction technology is proposed with improved CNN and PCA quadratic dimensionality reduction. Firstly, in the last layer of the classical networks, this study makes a well-designed DR-Module (dimensionality reduction module) to compress the number of channels of the feature map as much as possible, and ensures the amount of information. Secondly, the deep features are compressed again with PCA (Principal Components Analysis), and the compression ratios of the two dimensionality reductions are reduced, respectively. Therefore, the retrieval efficiency is dramatically improved. Finally, it is proved on the Cifar100 and Caltech101 datasets that the novel method not only improves the retrieval accuracy but also enhances the retrieval efficiency. Experimental results strongly demonstrate that the proposed method performs well in small and medium-sized datasets.

---

Keywords

---