SINGLE-LENS EXTENDED DEPTH-OF-FIELD IMAGING SYSTEMS

摘要

An extended depth of field (EDOF) imaging system that has a correspondingextended depth of focus(EDOF'). The imaging system has an optical system (20) consisting of a singlelens element and anobjectwise aperture stop arrange substantially at a zero-coma axial positionThe single lens elementis configured so that the optical system has a select amount of sphericalaberration (SA) in the range0 2.lambda.= SA = 2.lambda., where .lambda. is an imagingwavelength The single lens element generates an amount ofaxial chromatic aberration that increases the EDOF while decreasing theaverage MTF of the opticalsystem relative to the optical system having no chromatic aberration Theimaging system has animage sensor for forming a digitized raw image of an object