Title

Applications of digital holography in direct phase retrieval using transport of intensity and in 3D surface feature extraction

Date of Award

2021

Degree Name

M.S. in Electro-Optics and Photonics

Department

Department of Electro-Optics and Photonics

Advisor/Chair

Partha P. Banerjee

Abstract

Phase information plays an important role in three-dimensional (3D) imaging. Digital holography (DH) has been widely used in 3D imaging to reconstruct the phase distribution from optical fields. The transport of intensity equation (TIE) is a way to retrieve true or unwrapped phase from phase objects with multiple captures of intensity images along the light propagation direction. In this thesis, solving TIE with the help of the transport of phase equation (TPE) is first proposed. Combining TIE with TPE can further improve the accuracy of the Fourier transform based TIE solution with no extra captures of intensity images and little sacrifice of computational efforts. Next, the combination of DH and TIE is investigated to retrieve phase without any phase unwrapping and multiple captures of intensities. Finally, correlation of holograms is proposed to extract 3D surface features directly from 2D holograms. As an illustration, an application to face recognition is presented.

Keywords

Optics, digital holography, transport of intensity, transport of phase, phase retrieval, surface identification

Rights Statement

Copyright © 2021, author.

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