Gradation representation method using binary-weighted computer-generated hologram

Masato Fujiwara; Naoki Takada; Hiromitsu Araki; Shohei Ikawa; Hiroaki Niwase; Yuki Maeda; Hirotaka Nakayama; Takashi Kakue; Tomoyoshi Shimobaba; Tomoyoshi Ito

doi:10.1117/1.OE.56.2.023105

24 February 2017 Gradation representation method using binary-weighted computer-generated hologram

Masato Fujiwara, Naoki Takada, Hiromitsu Araki, Shohei Ikawa, Hiroaki Niwase, Yuki Maeda, Hirotaka Nakayama, Takashi Kakue, Tomoyoshi Shimobaba, Tomoyoshi Ito

Author Affiliations +

Funded by: Grant-in-Aid for Scientific Research (C), Japan Society for the Promotion of Science through a Grant-in-Aid for Scientific Research (C), Japan Society for the Promotion of Science (JSPS), JSPS KAKENHI, Japan Society for the Promotion of Science KAKENHI, Japan Society for the Promotion of Science (JSPS) KAKENHI, Grant-in-Aid for Scientific Research (A)

Optical Engineering, Vol. 56, Issue 2, 023105 (February 2017). https://doi.org/10.1117/1.OE.56.2.023105

Abstract

We propose a simple gradation representation method for a reconstructed three-dimensional (3-D) image without controlling the brightness of the reference light. In the proposed method, we use multiple bit planes comprised of binary-weighted computer-generated holograms (CGHs) with various light transmittances. Binary-weighted CGH is generated by changing the white in the conventional binary CGH to gray. The light transmittance of a binary-weighted CGH is less than that of a conventional binary CGH. The object points of a 3-D object are assigned to multiple bit planes according to the gray level of the object points. The multiple bit planes are displayed sequentially in a time-division multiplex manner. Consequently, the proposed method realizes a gradation representation of a reconstructed 3-D object.

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Masato Fujiwara, Naoki Takada, Hiromitsu Araki, Shohei Ikawa, Hiroaki Niwase, Yuki Maeda, Hirotaka Nakayama, Takashi Kakue, Tomoyoshi Shimobaba, and Tomoyoshi Ito "Gradation representation method using binary-weighted computer-generated hologram," Optical Engineering 56(2), 023105 (24 February 2017). https://doi.org/10.1117/1.OE.56.2.023105

Received: 6 December 2016; Accepted: 6 February 2017; Published: 24 February 2017

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