Extended DoF and achromatic inverse imaging for lens and lensless MPM camera based on Wiener filtering of defocused OTFs

Abstract

Optimal optical transfer function (OTF) is proposed for RGB inverse imaging with extended depth of focus (DoF) and diminished color aberrations. This optimal OTF is derived as the Wiener filter of broadband defocused OTFs. The performance of this new inverse imaging is demonstrated for optical setups with lens and lensless with a multilevel phase mask (MPM) instead of the lens. The later lensless system designed for the wavelength range (400-700) nm and DoF range (0.5-1000) m demonstrates the best performance.