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Recent progress on multi-domain optimization for ultra-thin cameras Amit Ashoka
 

Summary: H ___
Recent progress on multi-domain optimization for ultra-thin cameras
Amit Ashoka
and Mark A. Neifelda,b
a
Dept. of Electrical and Computer Engineering, University of Arizona, Tucson, AZ USA 85721
b
College of Optical Sciences, University of Arizona, Tucson, AZ USA 85721
ABSTRACT
Conventional imaging systems can suffer from significant aliasing and/or blur distortions when the detector array in the
focal plane under-samples the image. We propose to address this problem by engineering the optical PSF of the imaging
system followed by electronic post-processing to minimize the overall distortions. The optical PSF of the candidate
imaging system is modified by placing a phase-mask in its aperture-stop. We consider a particular parameterization of
the phase-mask and optimize its parameters to minimize the distortions. We obtain as much as 30% improvement in the
final imaging quality with the optimized optical PSF imager (SPEL) relative to the conventional imager.
Keywords: PSF engineering, aliasing, under-sampling, multiple images, imaging system, sub-pixel, phase-mask.
1. INTRODUCTION
Designing a high-resolution optical imaging system usually leads to an impulse-like optical point spread function (PSF).
This is justified as the resolution of a conventional optical imager is seen to be limited by its optical PSF [1]. However,
when such an optical system is followed by a semiconductor detector array, the resulting detector blur and/or aliasing

  

Source: Ashok, Amit - Department of Electrical and Computer Engineering, University of Arizona

 

Collections: Engineering