Calculation reduction method for color digital holography and computer-generated hologram using color space conversion

Tomoyoshi Shimobaba; Yuki Nagahama; Takashi Kakue; Naoki Takada; Naohisa Okada; Yutaka Endo; Ryuji Hirayama; Daisuke Hiyama; Tomoyoshi Ito

doi:10.1117/1.OE.53.2.024108

28 February 2014 Calculation reduction method for color digital holography and computer-generated hologram using color space conversion

Tomoyoshi Shimobaba, Yuki Nagahama, Takashi Kakue, Naoki Takada, Naohisa Okada, Yutaka Endo, Ryuji Hirayama, Daisuke Hiyama, Tomoyoshi Ito

Author Affiliations +

Optical Engineering, Vol. 53, Issue 2, 024108 (February 2014). https://doi.org/10.1117/1.OE.53.2.024108

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.

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Tomoyoshi Shimobaba, Yuki Nagahama, Takashi Kakue, Naoki Takada, Naohisa Okada, Yutaka Endo, Ryuji Hirayama, Daisuke Hiyama, and Tomoyoshi Ito "Calculation reduction method for color digital holography and computer-generated hologram using color space conversion," Optical Engineering 53(2), 024108 (28 February 2014). https://doi.org/10.1117/1.OE.53.2.024108

Published: 28 February 2014

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