**Tatsuki Tahara 1,2,3,\*, Reo Otani <sup>4</sup> and Yasuhiro Takaki <sup>5</sup>**


Received: 22 October 2018; Accepted: 26 November 2018; Published: 28 November 2018

**Abstract:** The quality of reconstructed images in relation to the bit depth of holograms formed by wavelength-selective phase-shifting digital holography was investigated. Wavelength-selective phase-shifting digital holography is a technique to obtain multiwavelength three-dimensional (3D) images with a full space-bandwidth product of an image sensor from wavelength-multiplexed phase-shifted holograms and has been proposed since 2013. The bit resolution required to obtain a multiwavelength holographic image was quantitatively and experimentally evaluated, and the relationship between wavelength resolution and dynamic range of an image sensor was numerically simulated. The results indicate that two-bit resolution per wavelength is required to conduct color 3D imaging.

**Keywords:** three-dimensional imaging; digital holography; multiwavelength digital holography; color holography; phase-shifting interferometry; phase-shifting digital holography
