All-optical extended depth of field imaging system

作者：Ben Eliezer E^*; Zalevsky Z; Marom E; Konforti N

来源：Journal of Optics A: Pure and Applied Optics , 2003, 5(5): S164-S169.

DOI：10.1088/1464-4258/5/5/359

• imaging systems
• OTF
• MTF
• extended depth of field

We describe a novel approach whereby a phase mask consisting of several spatially multiplexed Fresnel lenses (FL) positioned in the pupil of an imaging system increases the depth of field (DOF) significantly. Each FL acts essentially as a corrective lens with a slightly different focal length. Keeping the detector plane in a fixed location, each individual FL provides perfect imaging for different object planes, with a certain DOF tolerance around it. Allowing the individual DOFs to overlap slightly, the resulting composite DOF of the imaging system is highly extended. Nevertheless, the increased DOF is coupled with a reduction in image contrast and resolution. System analysis and simulation results are presented.

• 出版日期2003-9