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김진겸(Jin-Kyum Kim),오관정(Kwan-Jung Oh),김진웅(Jin-Woong Kim),김동욱(Dong-Wook Kim),서영호(Young-Ho Seo) 한국방송·미디어공학회 2021 방송공학회논문지 Vol.26 No.2
In this paper, we propose a method of compressing digital hologram standardized data provided by JPEG Pleno. In numerical reconstruction of digital holograms, the addition of random phases for visualization reduces speckle noise due to interference and doubles the compression efficiency of holograms. Holograms are composed of completely complex floating point data, and due to ultra-high resolution and speckle noise, it is essential to develop a compression technology tailored to the characteristics of the hologram. First, frequency characteristics of hologram data are analyzed using various wavelet filters to analyze energy concentration according to filter types. Second, we introduce the subband selection algorithm using energy concentration. Finally, the JPEG2000, SPIHT, H.264 results using the Daubechies 9/7 wavelet filter of JPEG2000 and the proposed method are used to compress and restore, and the efficiency is analyzed through quantitative quality evaluation compared to the compression rate.
김진겸(Jin-Kyum Kim),김경진(Kyung-Jin Kim),김우석(Woo-Suk Kim),이윤혁(Yoon-Huck Lee),오관정(Kwan-Jung Oh),김진웅(Jin-Woong Kim),김동욱(Dong-Wook Kim),서영호(Young-Ho Seo) 한국방송·미디어공학회 2019 방송공학회논문지 Vol.24 No.1
This paper introduces the analysis and development of digital holographic data codec technology to effectively compress hologram data. First, the generation method and data characteristics of the hologram standard data set provided by JPEG Pleno are introduced. We analyze energy compaction according to hologram generation method using discrete wavelet transform and discrete cosine transform. The quantization efficiency according to the hologram generation method is analyzed by applying uniform quantization and non-uniform quantization. We propose a transformation method quantization method suitable for hologram generation method through transform and quantization experiments. Finally, holograms are compressed using standard compression codecs such as JPEG, JPEG2000, AVC/H.264 and HEVC/H.265 and the results are analyzed.