Holographic encryption of color video with 4K resolution using phase liquid crystal spatial light modulators
Dmitry A. Rymov, Anna V. Shifrina, Pavel A. Cheremkhin, Vladislav G. Rodin, V. V. Krasnov · Izmeritel`naya Tekhnika · 2023
The communications number and information size are significantly increasing. Transmission of various types information (including video information) should be fast and protected from unauthorized access. The use of optical encryption for this purpose makes it possible to encode large data arrays with high cryptographic strength. Most optical information encoding systems use coherent light, which results in an extremely low signal-to-noise ratio in decrypted images. Holographic encryption of color 4K video with digital information input and dynamically changeable encoding holograms by means of the liquid crystal spatial light modulators of high resolution was implemented for the first time. The method is based on optical convolution of the input image with the encoding hologram using spatially-incoherent light. Color encoding is carried out by sequential encryption of different color channels of each video frame. Decryption is carried out by numerical methods of inverse filtering with regularization. Results of this work can be used for creation of high resolution secure video communication systems of new generation.