Acceleration of phase-only hologram generation by sub-image preiteration

Yoo Kwang Kim; Won jong Ryu; Yong Hyub Won

doi:10.1117/12.2543118

21 February 2020 Acceleration of phase-only hologram generation by sub-image preiteration

Yoo Kwang Kim, Won jong Ryu, Yong Hyub Won

Proceedings Volume 11306, Practical Holography XXXIV: Displays, Materials, and Applications; 113060H (2020) https://doi.org/10.1117/12.2543118
Event: SPIE OPTO, 2020, San Francisco, California, United States

Abstract

Holograms are a promising technology for realizing a natural three-dimensional display. While the holographic pattern records both the phase and intensity information of an object, the spatial light modulator, which is a device for reproducing it, is capable of modulating either phase or amplitude. Therefore, in order to realize a perfect holographic image, a complex hologram must be converted into a phase-only hologram. Currently, SLM resolution is 4k or less, but resolution needs to be increased to achieve better quality holograms. This will increase the computational complexity of the Fourier transform, which is needed for each iterate. Therefore, a way to create a phase-only-hologram with a minimum number of iterations is needed. It is known that in the iterative method, the initial predicted value greatly affects the result. In this study, we propose a method to make initial guess to obtain more accurate phase only hologram with fewer iteration times. To obtain the initial guess, the desired image was divided into several parts, and the phaseonly hologram corresponding to each was obtained and added again. We used hybrid-input-output iteration to maximize the effect of pre-iterated guess. When iterates the same number of times, the peak signal-to-noise ratio (PSNR) value obtained by using proposed pre-iterated guess was higher than using the random initial guess. In other words, the desired PSNR value can be reached with a smaller number of iterations by using proposed method. After 15 iterations, proposed initial guess have ~0.3dB higher PSNR value, which means one or two times of reduced iterations.

Conference Presentation

Citation Download Citation

Yoo Kwang Kim, Won jong Ryu, and Yong Hyub Won "Acceleration of phase-only hologram generation by sub-image preiteration", Proc. SPIE 11306, Practical Holography XXXIV: Displays, Materials, and Applications, 113060H (21 February 2020); https://doi.org/10.1117/12.2543118

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