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Pseudorandom phase masks for superresolution imaging from subpixel shifting

Summary: Pseudorandom phase masks for superresolution imaging
from subpixel shifting
Amit Ashok and Mark A. Neifeld
We present a method for overcoming the pixel-limited resolution of digital imagers. Our method combines
optical point-spread function engineering with subpixel image shifting. We place an optimized pseudo-
random phase mask in the aperture stop of a conventional imager and demonstrate the improved
performance that can be achieved by combining multiple subpixel shifted images. Simulation results
show that the pseudorandom phase-enhanced lens (PRPEL) imager achieves as much as 50% resolution
improvement over a conventional multiframe imager. The PRPEL imager also enhances reconstruction
root-mean-squared error by as much as 20%. We present experimental results that validate the predicted
PRPEL imager performance. 2007 Optical Society of America
OCIS codes: 110.0110, 110.4190, 100.6640, 100.3020.
1. Introduction
Semiconductor detector arrays are rapidly replacing
film as the recording medium of choice within many
modern imagers.1 This trend has led to a preponder-
ance of digital cameras in nearly all applications
ranging from consumer photography to modern bio-
medical imaging. Digital imager design, therefore,
is becoming an increasingly important activity. With-


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


Collections: Engineering