Color image encryption based on fractional Fourier transforms and pixel scrambling technique

Jianlin Zhao; Hongqiang Lu; Qi Fan

doi:10.1117/12.725349

11 January 2007 Color image encryption based on fractional Fourier transforms and pixel scrambling technique

Jianlin Zhao, Hongqiang Lu, Qi Fan

Proceedings Volume 6279, 27th International Congress on High-Speed Photography and Photonics; 62793B (2007) https://doi.org/10.1117/12.725349
Event: 27th International congress on High-Speed Photography and Photonics, 2006, Xi'an, China

Abstract

Color image encryption based on fractional Fourier transform (FRT) and pixel scrambling technique is presented in this paper. In general, color (RGB) image cannot be directly encrypted using a traditional setup for optical information processing, because which is only adapted to process two-dimensional gray image. In the proposed method, a three-dimensional RGB image is decomposed to three two-dimensional gray images (R, G and B values of the color image), and the encryption operation will be done on each two-dimensional gray image, then the encoded color image is available by composing the three two-dimensional encrypted images. The decryption process is an inverse of the encryption. The optical encrypting systems based on the presented method is proposed and simulated. Some results of computer simulation are presented to verify the flexibility and the reliability of this method. The quality of decrypted images would be debased with the difference of the fractional order. The frustrated decryption of monochromic image will affect the color of decrypted image. At the end of this paper, an all-optical and photoelectric encryption/decryption systems solution are presented, and the principle of selecting optical devices are also given.

Citation Download Citation

Jianlin Zhao, Hongqiang Lu, and Qi Fan "Color image encryption based on fractional Fourier transforms and pixel scrambling technique", Proc. SPIE 6279, 27th International Congress on High-Speed Photography and Photonics, 62793B (11 January 2007); https://doi.org/10.1117/12.725349

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