title: Rational phase mask to extend the depth of field in optical-digital hybrid imaging systems.
abstract: We propose a novel phase mask called the rational phase mask (RPM) to extend the depth of field in optical-digital hybrid imaging systems. Using the invariance to defocus of the modulation transfer function as the merit function, we adopt the simulated annealing algorithm to optimize the RPM together with the other three existing phase masks. Numerical comparisons prove the RPM's superiority.
authors.affiliation: Department of Precision Instrument and Mechanology, Tsinghua University, Beijing, China. zhou-f@mails.tsinghua.edu.cn
authors.forename: Feng
authors.initials: F
authors.lastname: Zhou
authors.forename: Guangwei
authors.initials: G
authors.lastname: Li
authors.forename: Haitao
authors.initials: H
authors.lastname: Zhang
authors.forename: Dongsheng
authors.initials: D
authors.lastname: Wang