title: Blind phase shift estimation in phase-shifting interferometry.
abstract: A blind phase shift estimation algorithm that allows simultaneous calculation of phases and phase shifts from three or more interferograms is presented. In phase-shifting interferometry, the phase shift errors introduce specific correlations between the calculated background intensity distribution and the fringe component. These correlations can be measured with a cross-power spectrum. By minimization of an objective function based on this cross-power spectrum, the actual phase shifts are estimated and used for phase recovery. The validity of this algorithm is verified by both the numerical simulation and the experiment results.
authors.affiliation: Department of Precision Mechanical Engineering, Shanghai University, Shanghai, China. hw-guo@yeah.net
authors.forename: Hongwei
authors.initials: H
authors.lastname: Guo
authors.forename: Yingjie
authors.initials: Y
authors.lastname: Yu
authors.forename: Mingyi
authors.initials: M
authors.lastname: Chen
mesh_terms: D000465:Algorithms; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D007368:Interferometry / Q000379:methods; D008858:Microscopy, Phase-Contrast / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity