首页|Eccentric-rotation-scanned ptychography and its application in multispectral watermarking
Eccentric-rotation-scanned ptychography and its application in multispectral watermarking
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NSTL
Elsevier
Due to the uncertainty that may occur during one experiment, the repetition of the same sample experiment is particularly important. Here we propose a novel eccentric-rotation-scanned ptychography (eRSP), eccentric rotation scanning is used to collect diffraction patterns instead of traditional mesh scanning. In the process of collecting diffraction patterns, only the single variable of rotation angle needs to be controlled. The position error is reduced from two-dimensional to one-dimensional, and the difficulty of experimental operation is greatly reduced. The repeatability of the experiment has been significantly improved. Rotating scanning can also avoid the raster grid pathology. In this paper, the theory of eRSP is introduced, and the feasibility of this method has been analyzed by simulation and optical experiment. A multi-spectral information hiding system based on eRSP was proposed. The double random-phase encoding system with a color random phase mask is embedded into a retractable cylinder. A super-continuum white laser source is used as the incident beam, records the ciphertext diffraction pattern by rotating the cylinder and embedded them into the host image. Additional eccentric distance key, rotation angle key, spectrum key and telescopic distance key are introduced, which greatly enhance the system security. Numerical simulations are implemented to demonstrate the feasibility, security and robustness of the proposed scheme.
NSTL
Elsevier
