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Imaging Using Alternate Point Spread Functions: Lenslets with Pseudo-Random Phase Diversity
 

Summary: Imaging Using Alternate Point Spread Functions: Lenslets
with Pseudo-Random Phase Diversity
Mark A. Neifeld and Amit Ashok
ECE Department/Optical Sciences Center
University of Arizona, Tucson, AZ 85721
Abstract: An optical imaging system's resolution can often be limited by the detector array
instead of the optics. We present alternate non-impulse like optical point spread functions that
overcome the distortions introduced by the detector array.
2005 Optical Society of America
The optical point spread function (PSF) is often viewed as the resolution-limiting element of an
imager [1]. For this reason conventional optical design procedures typically strive to achieve an
impulse-like PSF. When such a well-designed optical system is followed by a semiconductor
detector array, the resulting pixel blur and/or aliasing can become the dominant distortions
present in the overall imager. In this case it is necessary to revisit the optical design. The optical
PSF may now be viewed as a method of encoding the image measurement so as to better tolerate
the distortions introduced by the detector array. Within such a framework we find that an
impulse-like PSF can be suboptimal.
Figure 1 depicts a schematic example of the problem discussed above. In figure 1a we show the
image arising from a single point source in the object space of a conventional imager (i.e., one
that uses an impulse-like PSF). Figure 1b shows the image of the same point object in a slightly

  

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

 

Collections: Engineering