| Optical encryption with cascaded fractional wavelet transforms |
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| 作者姓名： | BAO Liang-hua CHEN Lin-fei ZHAO Dao-mu |
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| 作者单位： | BAO Liang-hua?1，2，CHEN Lin-fei1，ZHAO Dao-mu??1 (1Department of Physics，Zhejiang University，Hangzhou 310027，China) (2Department of Physics，Zhejiang Education College，Hangzhou 310012，China) |
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| 基金项目： | Project (No. 10276034) supported by the National Natural ScienceFoundation of China |
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| 摘 要： | INTRODUCTION Recently, with the development of science andtechnology, more and more people become interestedin researching image encryption techniques. Manymethods have been proposed for optical image en-cryption. Random phase encoding methods and digi-tal holography techniques are effectively used inencrypting (Javidi and Nomura, 2000; Unnikrishnanet al., 2000a; Hennelly and Sheridan, 2003; Nishchalet al., 2004). Meantime some important properties oflight are used to realize encryptio…
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| 关 键 词： | 小波变换 CFWT 密码术 光学编码 解密 |
| 收稿时间： | 2006-01-06 |
| 修稿时间： | 2006-03-22 |
Optical encryption with cascaded fractional wavelet transforms |
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| BAO Liang-hua CHEN Lin-fei ZHAO Dao-mu.Optical encryption with cascaded fractional wavelet transforms[J].Journal of Zhejiang University Science,2006,7(8):1431-1435. |
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| Authors: | Liang-hua Bao Lin-fei Chen Dao-mu Zhao |
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| Institution: | (1) Department of Physics, Zhejiang University, Hangzhou, 310027, China;(2) Department of Physics, Zheijiang Education College, Hangzhou, 310012, China |
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| Abstract: | On the basis of fractional wavelet transform, we propose a new method called cascaded fractional wavelet transform to encrypt images. It has the virtues of fractional Fourier transform and wavelet transform. Fractional orders, standard focal lengths and scaling factors are its keys. Multistage fractional Fourier transforms can add the keys easily and strengthen information se-curity. This method can also realize partial encryption just as wavelet transform and fractional wavelet transform. Optical reali-zation of encryption and decryption is proposed. Computer simulations confirmed its possibility. |
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| Keywords: | Wavelet transform (WT) Cascaded fractional wavelet transform (CFWT) Encryption Decryption |
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