title: Color computer-generated hologram generation using the random phase-free method and color space conversion.
abstract: We propose two calculation methods of generating color computer-generated holograms (CGHs) with the random phase-free method and color space conversion in order to improve the image quality and accelerate the calculation. The random phase-free method improves the image quality in monochrome CGH, but it is not performed in color CGH. We first aimed to improve the image quality of color CGH using the random phase-free method and then to accelerate the color CGH generation with a combination of the random phase-free method and color space conversion method, which accelerates the color CGH calculation due to down-sampling of the color components converted by color space conversion. To overcome the problem of image quality degradation that occurs due to the down-sampling of random phases, the combination of the random phase-free method and color space conversion method improves the quality of reconstructed images and accelerates the color CGH calculation. We demonstrated the effectiveness of the proposed method in simulation, and in this paper discuss its application to lensless zoomable holographic projection.
authors.forename: Tomoyoshi
authors.initials: T
authors.lastname: Shimobaba
authors.forename: Michał
authors.initials: M
authors.lastname: Makowski
authors.forename: Yuki
authors.initials: Y
authors.lastname: Nagahama
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Endo
authors.forename: Ryuji
authors.initials: R
authors.lastname: Hirayama
authors.forename: Daisuke
authors.initials: D
authors.lastname: Hiyama
authors.forename: Satoki
authors.initials: S
authors.lastname: Hasegawa
authors.forename: Marie
authors.initials: M
authors.lastname: Sano
authors.forename: Takashi
authors.initials: T
authors.lastname: Kakue
authors.forename: Minoru
authors.initials: M
authors.lastname: Oikawa
authors.forename: Takashige
authors.initials: T
authors.lastname: Sugie
authors.forename: Naoki
authors.initials: N
authors.lastname: Takada
authors.forename: Tomoyoshi
authors.initials: T
authors.lastname: Ito