Phase estimation for Zernike circle polynomials using Phase Locked Loops for investigations of camera aberrations

Abstract

This paper proposes a method to investigate aberrations of cameras from phase recovered fringe patterns using first-order Phase Locked Loop (PLL). Images of fringe patterns of different spatial periods are captured using different cameras. First-order PLL is applied to recover phase information from the captured images. Zernike circle polynomials are fitted to the phase recovered and Zernike coefficients are computed using the Gaussian elimination method. Comparison of cameras in terms of aberrations is done using these Zernike coefficients. Phase is also recovered and fitted for fringe patterns captured using the same camera with different lens combinations.