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A New Image Encryption Method using Quad-tree based Fresnelet Transform

쿼드트리 방식의 프레넬릿 변환을 이용한 영상의 암호화 기법

Seo, Young-ho;Lee, Yoon-hyuk;Kim, Dong-wook
서영호;이윤혁;김동욱

  • Received : 2015.08.19
  • Accepted : 2015.09.25
  • Published : 2015.12.31

Abstract

This paper proposes a new method which traces significant element of 2-dimensional natural images and encrypts them by using Fresnelet transform (FRNLT). After analyzing property of the subbands obtained by the FRNLT, we estimated the information for ciphering 2D images. Considering FRNLT levels, energy of subbands, and visual effect, we estimated the optimized point for encryption. By selecting various levels and encrypting region, we can encrypt 2D image with various robustness. Encryption effectiveness was showed by analyzing numerical result, executing time for encryption, area of encrypted region, and visual observation. Therefore encryption for various application can be applied by using the suggested parameters without additional analysis. Identifying the experimental result, in the case of $L_{TH}=4$ and $L_{TH}=4$, an image was not recognized through encrypting only 0.42% among the entire data.

Keywords

Encryption;Discrete Fresnelet Transform;Quad Tree;Subband Energy

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Acknowledgement

Supported by : National Research Foundation of Korea (NRF)