Simultaneous optical image compression and encryption using error-reduction phase retrieval algorithm

作者：Liu Wei^*; Liu Zhengjun; Liu Shutian

来源：Journal of Optics, 2015, 17(12): 125701.

DOI：10.1088/2040-8978/17/12/125701

• optical compression
• encryption
• inverse problem
• phase retrieval

We report a simultaneous image compression and encryption scheme based on solving a typical optical inverse problem. The secret images to be processed are multiplexed as the input intensities of a cascaded diffractive optical system. At the output plane, a compressed complex-valued data with a lot fewer measurements can be obtained by utilizing error-reduction phase retrieval algorithm. The magnitude of the output image can serve as the final ciphertext while its phase serves as the decryption key. Therefore the compression and encryption are simultaneously completed without additional encoding and filtering operations. The proposed strategy can be straightforwardly applied to the existing optical security systems that involve diffraction and interference. Numerical simulations are performed to demonstrate the validity and security of the proposal.

• 出版日期2015-12
• 单位哈尔滨工业大学