A superresolution method for interference fringes obtained by parallel four-step phase-shifting digital holography is proposed. A complex amplitude distribution of an object wave is derived from a recorded hologram by parallel phase-shifting interferometry using two pixels without any interpolation procedures. Multiple distributions are derived by changing one of the two pixels when conducting phase-shifting interferometry. The angular spectrum distribution of the object wave is obtained by both the Fourier transforms and synthesis of the spectrum distribution from the Fourier-transformed images in the spatial frequency domain. Available space bandwidth is extended to half of that of an image sensor.
© 2014 Optical Society of America
Original Manuscript: December 16, 2013
Revised Manuscript: January 16, 2014
Manuscript Accepted: January 27, 2014
Published: March 14, 2014
Vol. 9, Iss. 5 Virtual Journal for Biomedical Optics
Tatsuki Tahara, Yonghee Lee, Yasunori Ito, Peng Xia, Yuki Shimozato, Yuki Takahashi, Yasuhiro Awatsuji, Kenzo Nishio, Shogo Ura, Toshihiro Kubota, and Osamu Matoba, "Superresolution of interference fringes in parallel four-step phase-shifting digital holography," Opt. Lett. 39, 1673-1676 (2014)