| 基于柱面衍射和彩色空间转换的单通道彩色图像加密 |
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| 引用本文： | 常柯明,陈叶,王莹,王君.基于柱面衍射和彩色空间转换的单通道彩色图像加密[J].红外与激光工程,2018,47(6):603003-0603003(6). |
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| 作者姓名： | 常柯明 陈叶 王莹 王君 |
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| 作者单位： | 1.四川大学 电子信息学院,四川 成都 610065 |
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| 基金项目： | 国家重点研发计划（2017YFB1002900） |
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| 摘 要： | 为了解决传统密码系统由于对称特性导致的安全性低的问题，提出了一种新的基于柱面衍射和彩色空间转换的单通道彩色图像加密方法。在加密过程中，首先将彩色图像变换为YCbCr4:2:0格式的单通道图像，然后经过两次柱面衍射和相位截断操作对图像进行加密。在解密过程中，将密钥与密文结合，经过两次柱面逆衍射后重建出彩色原图。由于柱面衍射过程是一个非对称的过程，此算法可以克服基于平面衍射的加密系统的对称特性，将其应用到基于相位截断的加密系统中可以进一步有效提高加密系统的安全性。仿真结果表明，该算法能够有效地对彩色图像进行单通道加密，不仅可以高质量地恢复原始彩色图像，而且加密系统具有较高的安全性。
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| 关 键 词： | 信息光学 彩色图像加密 柱面衍射 非对称加密 |
| 收稿时间： | 2018-01-11 |
Single-channel color image encryption using cylindrical diffraction and color space converting |
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| Affiliation: | 1.School of Electronics and Information Engineering,Sichuan University,Chengdu 610065,China |
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| Abstract: | In order to solve the problem of vulnerable to attacks caused by symmetry in traditional cryptographic systems, a new single-channel color image encryption using detour cylindrical diffraction and color space conversion algorithm was proposed in this paper. In the process of encryption, firstly, the color image was transformed into a single channel image in YCbCr4:2:0 format, then the image was encrypted by twice cylindrical diffraction and phase truncation operations. In the process of decryption, the keys were combined with the cipher text, and the color original image was reconstructed after twice inverse cylindrical diffraction. Because the cylindrical diffraction process was an asymmetric process, the proposed algorithm can overcome the symmetry characteristic of the encryption system based on plane diffraction. Applying it to the encryption system based on phase truncation can further improve the security of the encryption system. The simulation results show that the algorithm can effectively encrypt the color image with single channel, which not only can restore the original color image with high quality, but also has high security. |
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