Lin MIAO¹, Kouichi NITTA¹, Osamu MATOBA^1*, and Yasuhiro AWATSUJI²

¹Department of Systems Science, Graduate School of System Informatics, Kobe University, Kobe 657-8501, Japan
²Division of Electronics, Graduate School of Science and Technology, Kyoto Institute of Technology, Kyoto 606-8585, Japan

(Received May 22, 2013; Revised September 3, 2013; Accepted September 20, 2013)

Parallel phase-shifting digital holography (PPSDH) enables the instantaneous recording of three-dimensional fields. The three-dimensional field can be reconstructed using a computer by numerical scalar wave propagation. In PPSDH, we record a space-division multiplexed hologram that includes the required phase retardation in the spatial distribution of the reference wave and then interpolate the data at blanked pixels for each phase retardation to obtain the complex amplitude distribution of an object wave. The recorded quality of the multiplexed hologram influences the reconstruction quality. In this study, we investigate the effect of the intensity quantization of a multiplexed hologram on the reconstruction quality. We compare the influence of intensity quantization in PPSDH with that in the conventional phase-shifting method. Random noise is also added to the multiplexed hologram. The required intensity quantization level is helpful for selecting a digital image sensor.

Key words: digital holography, parallel phase-shifting digital holography, intensity quantization

^*E-mail address: matoba@kobe-u.ac.jp