Abstract
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.
Highlights
The holography was first proposed by Gabor in 1948 [1] and has been researched and developed in many fields due to its ability to fully record 3D information
We tried a method to directly compress the phase information to overcome the drawbacks of the method of independently compressing real and imaginary parts
We selected the HEVC as the anchor codec and proposed a modified unwrapping algorithm with three directions to transform it into phase information in a form suitable for the HEVC Intra prediction
Summary
The holography was first proposed by Gabor in 1948 [1] and has been researched and developed in many fields due to its ability to fully record 3D information. A hologram in the form of a complex number expressed in a floating-point format may be expressed as a pair of real (RE) and imaginary numbers (IM), or amplitude (AM) and phase (PH) Since these pairs display the same information, but show different characteristics, there is a possibility that the effect on compression will be different. When the real and imaginary components are independently compressed, the phase information of the hologram may not be considered, and the quality of the reconstruction result of the hologram may not be proportional to the quality of the hologram. We tried to infer the characteristics of the phase component of the hologram by compressing the real and imaginary components in different ways. We try to efficiently compress phase information that is very difficult to compress
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
