NDLI: JPEG-based scalable privacy protection and image data utility preservation

Content Provider	IET Digital Library
Author	Ruchaud, Natacha Dugelay, Jean Luc
Abstract	Here, the authors propose a scalable scrambling algorithm operating in the discrete cosine transform (DCT) domain within the JPEG codec. The goal is to ensure that people are no more identifiable while keeping their actions still understandable regardless of the image size. For each 8 × 8 block, the authors encrypt the DCT coefficients to protect data information, and shift them towards the high frequencies to make the DC position available. Whereas encrypted coefficients appear as noise in the protected image, the DC position is dedicated to restitute some of the original information (e.g. the average colour associated with one or a group of blocks). The proposed approach automatically sets the value of each DC according to the region of interest size in order to keep the level of privacy protection strong enough. Comparing to existing methods, the proposed privacy protection framework provides flexibility concerning the appearance of the protected version which makes it stronger for protecting the privacy even during potential attacks. Moreover, the method does not cause excessive perturbation for the recognition of the actions and slightly decreases the efficiency of the JPEG standard.
Starting Page	881
Ending Page	887
Page Count	7
ISSN	17519675
Volume Number	12
e-ISSN	17519683
Issue Number	Issue 7, Sep (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-spr/12/7
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-spr.2017.0413
Journal	IET Signal Processing
Publisher Date	2018-03-23
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Computer Vision And Image Processing Technique Cryptography Data Compression Data Information Protection Data Privacy Data Security DCT Discrete Cosine Transform Encrypted Coefficient Image And Video Coding Image Coding Image Data Utility Preservation Image Recognition Integral Transforms JPEG Codec JPEG-based Scalable Privacy Protection Framework Scalable Scrambling Algorithm
Content Type	Text
Resource Type	Article
Subject	Signal Processing Electrical and Electronic Engineering

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