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Article

Intra Prediction-Based Hologram Phase Component Coding Using Modified Phase Unwrapping

1
Department of Electronic Materials Engineering, Kwangwoon University, Seoul 01897, Korea
2
Electronics and Telecommunications Research Institute, Daejeon 34129, Korea
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Ting-Chung Poon
Appl. Sci. 2021, 11(5), 2194; https://doi.org/10.3390/app11052194
Received: 31 December 2020 / Revised: 16 February 2021 / Accepted: 23 February 2021 / Published: 3 March 2021
(This article belongs to the Special Issue Practical Computer-Generated Hologram for 3D Display)
In this paper, we propose a method for compressing the phase component of a full-complex hologram. The JPEG (Joint Photographic Experts Group) Pleno is undergoing standardization for compressing full-complex holograms. If the full-complex hologram is compressed in the form of amplitude and phase components, the three-dimensional information of the hologram may be better preserved. Therefore, in order to solve the disadvantages of the method of independently compressing real and imaginary parts, we propose a method for directly compressing phase information. We select the HEVC (High Efficiency Video Coding), which has the best performance in compressing holograms from previous studies, as the anchor codec, and propose an algorithm for converting the phase information into the form suitable for the HEVC. Since the phase component is very random, we propose a modified phase unwrapping technique to improve this. In addition, in order to make good use of the property of HEVC Intra coding, the phase unwrapping considering Intra prediction is applied, and the most suitable HEVC Intra coding condition is searched. Compared with the result of compressing the phase using the HEVC, the hologram was improved by 2 dB or more and the reconstruction result was improved by more than 4 dB at a compression ratio of 80:1. If the compression ratio is increased, the proposed method has better results. View Full-Text
Keywords: hologram compression; phase unwrapping; HEVC Intra prediction; full-complex hologram hologram compression; phase unwrapping; HEVC Intra prediction; full-complex hologram
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MDPI and ACS Style

Kim, J.-K.; Oh, K.-J.; Kim, J.-W.; Kim, D.-W.; Seo, Y.-H. Intra Prediction-Based Hologram Phase Component Coding Using Modified Phase Unwrapping. Appl. Sci. 2021, 11, 2194. https://doi.org/10.3390/app11052194

AMA Style

Kim J-K, Oh K-J, Kim J-W, Kim D-W, Seo Y-H. Intra Prediction-Based Hologram Phase Component Coding Using Modified Phase Unwrapping. Applied Sciences. 2021; 11(5):2194. https://doi.org/10.3390/app11052194

Chicago/Turabian Style

Kim, Jin-Kyum, Kwan-Jung Oh, Jin-Woong Kim, Dong-Wook Kim, and Young-Ho Seo. 2021. "Intra Prediction-Based Hologram Phase Component Coding Using Modified Phase Unwrapping" Applied Sciences 11, no. 5: 2194. https://doi.org/10.3390/app11052194

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