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Optical Engineering

Calculation reduction method for color digital holography and computer-generated hologram using color space conversion
Author(s): Tomoyoshi Shimobaba; Yuki Nagahama; Takashi Kakue; Naoki Takada; Naohisa Okada; Yutaka Endo; Ryuji Hirayama; Daisuke Hiyama; Tomoyoshi Ito
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Paper Abstract

A calculation reduction method for color digital holography (DH) and computer-generated holograms (CGHs) using color space conversion is reported. Color DH and color CGHs are generally calculated on RGB space. We calculate color DH and CGHs in other color spaces for accelerating the calculation (e.g., YCbCr color space). In YCbCr color space, a RGB image or RGB hologram is converted to the luminance component (Y), blue-difference chroma (Cb), and red-difference chroma (Cr) components. In terms of the human eye, although the negligible difference of the luminance component is well recognized, the difference of the other components is not. In this method, the luminance component is normal sampled and the chroma components are down-sampled. The down-sampling allows us to accelerate the calculation of the color DH and CGHs. We compute diffraction calculations from the components, and then we convert the diffracted results in YCbCr color space to RGB color space. The proposed method, which is possible to accelerate the calculations up to a factor of 3 in theory, accelerates the calculation over two times faster than the ones in RGB color space.

Paper Details

Date Published: 28 February 2014
PDF: 7 pages
Opt. Eng. 53(2) 024108 doi: 10.1117/1.OE.53.2.024108
Published in: Optical Engineering Volume 53, Issue 2
Show Author Affiliations
Tomoyoshi Shimobaba, Chiba Univ. (Japan)
Yuki Nagahama, Chiba Univ. (Japan)
Takashi Kakue, Chiba Univ. (Japan)
Naoki Takada, Kochi Univ. (Japan)
Naohisa Okada, Chiba Univ. (Japan)
Yutaka Endo, Chiba Univ. (Japan)
Ryuji Hirayama, Chiba Univ. (Japan)
Daisuke Hiyama, Chiba Univ. (Japan)
Tomoyoshi Ito, Chiba Univ. (Japan)

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