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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/28354

Title: A Chaos-based Visual Encryption Mechanism in JPEG2000 Medical Images
Authors: Chin-Feng Lin;Wen-Thong Chang;Ching-Yi Li
Contributors: NTOU:Department of Electrical Engineering
國立臺灣海洋大學:電機工程學系
Keywords: Chaos;Visual encryption;JPEG-2000;Medical image
Date: 2007-09-01
Issue Date: 2011-10-21T02:37:15Z
Publisher: Journal of Medical and Biological Engineering
Abstract: Abstract:In this paper, we have developed a chaos-based visual encryption mechanism which can be applied in the JPEG2000 medical image. The main idea for using chaos sequence is to increase the unpredictability compared with other kinds of random sequences. Thus, our mechanism is based on an all-pass filtering implementation of a 2D chaotic phase scrambler, and a chaos-based permutation scheme. A way to realize the all-pass filtering is to scramble the phase spectra of the input JPEG2000 image by adding 2D chaotic signal to randomize reference phase spectra as pre-filtering, and then subtract the same reference phase spectra as post-filtering, to recover the original phase spectra of the most-important low-resolution sub-image. A single-layer chaotic image pixel scanning order encryption is applied to the least-important detail sub-images. Simulation results show when a correct deciphering parameter is put in, the signal will be completely recovered, and the peak signal-to-noise ratio (PSNR) value of the decrypted image is 61.9901 dB when using lossless JPEG2000 compression mode and 35 dB when using 10:1 JPEG2000 compression mode. In addition, the PSNR loss is about 3dB for the proposed loss visual encryption mechanism. As long as there is an input parameter error, for example, with 0.00000001% initial point error, it will make an error chaotic array, and the image will not be recovered.
Relation: 27(3), pp.144-149
URI: http://ntour.ntou.edu.tw/handle/987654321/28354
Appears in Collections:[電機工程學系] 期刊論文

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