Multiple color-image fusion and watermarking based on optical interference and wavelet transform |
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| Institution: | 1. Universitat de Barcelona (UB), Facultat de Física, Departament de Física Aplicada, Martí i Franquès 1, 08028 Barcelona, Spain;2. Electrical and Computer Engineering Department, University of Connecticut, 371 Fairfield Road, Storrs, CT 06269-4157, USA;3. Universidad Complutense de Madrid, Facultad de Ciencias Físicas, Departamento de Óptica, Ciudad Universitaria s/n, 28040 Madrid, Spain;1. Department of Optics, School of Information Science and Engineering, and Shandong Provincial Key Laboratory of Laser Technology and Application, Shandong University, Jinan 250100, China;2. College of Optoelectronics Engineering, Shenzhen University, Shenzhen 518060, China;3. College of Materials Science and Opto-Electronic Techology, University of Chinese Academy of Sciences, Beijing 100049, China;4. College of Electronic Science and Technology, Shenzhen University, Shenzhen 518060, China;1. Key Laboratory of Dependable Service Computing in Cyber Physical Society of Ministry of Education, College of Computer Science, Chongqing University, Chongqing 400044, China;2. Key Laboratory of Electronic Commerce and Logistics of Chongqing, Chongqing University of Posts and Telecommunications, Chongqing 400065, China;1. The School of Science, Hangzhou Dianzi University, Hangzhou 310018, China;2. Department of Electrical and Computer Engineering, National University of Singapore, 117583 Singapore;3. The school of Foreign Languages, Xidian University, Xi''an 710126, China;1. Department of Applied Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad, Jharkhand 826 004, India;2. School of Electrical and Electronic Engineering, IoE2 Lab, College of Engineering and Architecture, University College Dublin, Belfield, Dublin 4, Ireland;3. CREOL, The College of Optics & Photonics, University of Central Florida, Orlando, FL 32816, USA |
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| Abstract: | A novel multiple color-image fusion and watermarking using optical interference and wavelet transform is proposed. In this method, each secret color image is encoded into three phase-only masks (POMs). One POM is constructed as user identity key and the other two POMs are generated as user identity key modulated by corresponding secret color image in gyrator transform domain without using any time-consuming iterative computations or post-processing of the POMs to remove inherent silhouette problem. The R, G, and B channels of different user identity keys POM are then individually multiplied to get three multiplex POMs, which are exploited as encrypted images. Similarly the R, G, and B channels of other two POMs are independently multiplied to obtain two sets of three multiplex POMs. The encrypted images are fused with gray-level cover image to produce the final encrypted image as watermarked image. The secret color images are shielded by encrypted images (which have no information about secret images) as well as cover image (which reveals no information about encrypted images). These two remarkable features of the proposed system drastically reduce the probability of the encrypted images to be searched and attacked. Each individual user has an identity key and two phase-only keys as three decryption keys besides transformation angles regarded as additional keys. Theoretical analysis and numerical simulation results validate the feasibility of the proposed method. |
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| Keywords: | Multiple color-image fusion Watermarking Optical interference Wavelet transform |
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