Lossy Compression and Iterative Reconstruction for Encrypted Image

Author

Zhang, Xinpeng

Author_Institution

Sch. of Commun. & Inf. Eng., Shanghai Univ., Shanghai, China

Volume

6

Issue

1

fYear

2011

fDate

3/1/2011 12:00:00 AM

Firstpage

53

Lastpage

58

Abstract

This work proposes a novel scheme for lossy compression of an encrypted image with flexible compression ratio. A pseudorandom permutation is used to encrypt an original image, and the encrypted data are efficiently compressed by discarding the excessively rough and fine information of coefficients generated from orthogonal transform. After receiving the compressed data, with the aid of spatial correlation in natural image, a receiver can reconstruct the principal content of the original image by iteratively updating the values of coefficients. This way, the higher the compression ratio and the smoother the original image, the better the quality of the reconstructed image.

Keywords

cryptography; data compression; image coding; image reconstruction; iterative methods; data compression; data encryption; encrypted image; flexible compression ratio; image reconstruction quality; iterative reconstruction; lossy compression; natural image; orthogonal transform; pseudorandom permutation; spatial correlation; Image compression; image encryption; image reconstruction;

fLanguage

English

Journal_Title

Information Forensics and Security, IEEE Transactions on

Publisher

ieee

ISSN

1556-6013

Type

jour

DOI

10.1109/TIFS.2010.2099114

Filename

5665768