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7‐2: High‐contrast Encoding Method for Amplitude‐only Computer Generated Hologram
Author(s) -
An Jungkwuen,
Shin Bongsu,
Lee Chang-Kun,
Choi Chil-Sung,
Yoo Chorong,
Sung Geeyoung,
Kim Hojung,
Song Hoon,
Chung Jae-Seung,
Seo Juwon,
Won Kanghee,
Lee Sung-Hoon,
Kim Sunil,
Seo Wontaek,
Kim Yongkyu,
Kim Young,
Kim Yun-Tae,
Lee Hong-Seok,
Lee Duckhyung
Publication year - 2018
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1002/sdtp.12489
Subject(s) - holography , amplitude , encoding (memory) , optics , computer science , holographic display , artificial intelligence , computer vision , physics
The new encoding methods are proposed and demonstrated for amplitude‐only computer‐generated hologram (CGH). Traditionally, the amplitude‐only encoding method proposed by Burch, has been used over 50 years, because it is the deterministic solution for generating an ideal hologram added by its conjugated hologram. Since the amplitude‐only hologram cannot represent negative values, the result of Burch's encoding should always be added by some values, so that none of data is less than zero. It means that the electric‐field of zero amplitude mapped into the medium gray level in a spatial light modulator (SLM). In ideal holographic display, it does not cause any problem on reconstructing holograms, but the medium gray level actually adds the noise at the practical holographic display. We introduce the encoding methods which can map the zero amplitude into the zero gray level. These encoding methods can increase the contrast ratio of an amplitude‐only hologram by reducing unnecessary scattering and stray lights.