科研之友
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摘要
We analyse the di. raction result of optical. eld after Cosine zone plate, and theoretically deduce its transform matrix. Under some conditions, its di. raction distribution is a mixture of fractional Fourier spectra. Then we use Cosine zone plate and its di. raction result to image encryption. Possible optical image encryption and decryption implementations are proposed, and some numerical simulation results are also provided.
