Wave-front Coding: A New paradigm for imaging systems

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Wave-front CodingA New paradigm for imaging
systems

• W. Thomas Cathey and Edward R. Dowski
• W. T. Cathey is with the Department of Electrical
  and Computer Engineering, University of Colorado.
• E. R. Dowski is with CDM Optics, Incorporated,
  4001 Discovery Drive, Suite 2110, Boulder,
  Colorado 80303-7816.

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Traditional Imaging Systems
In Focus
Lens
Objects
CCD
Output Image
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Traditional Imaging Systems
Out of Focus
Lens
CCD
Objects
Output Image
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Wave-front Coding
Intermediate Image
Objects
Wave-front Coding Optical Element
Image Processing
Lens
CCD
E. R. Dowski, Jr., and W. T. Cathey, Extended
depth of field through wave-front coding, Appl.
Opt. 34, 18591866 1995. Imaging Systems
Laboratory, Department of Electrical Engineering,
University of Colorado, Boulder, Colorado 80309.
Output Image
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Traditional Imaging System
Wave-front Coding Imaging System
Object
CCD
Object
CCD
Lens
Lens
Wave-front Coding Optical Element
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Traditional Imaging System
Wave-front Coding Imaging System
Object
CCD
Object
CCD
Lens
Lens
Wave-front Coding Optical Element
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Traditional Imaging System
Wave-front Coding Imaging System
In Focus
In Focus
Out of Focus
CCD
Out of Focus
CCD
In Focus
In Focus
PSFs
PSFs
Out of Focus
Out of Focus
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H
System
Impulse
PSF
Output Signal
Input Signal
In Focus
In Focus
PSFs
PSFs
Out of Focus
Out of Focus
Traditional Imaging System
Wave-front Coding Imaging System
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Ambiguity Function A(u,v)
Phase Function P(x)
u Spatial Frequency ? Misfocus Parameter
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Spatial Frequency
Low
Spatial Frequency
High
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Modulation Transfer Functions (MTFs)
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Wave-front Coding Imaging System
PSFs
Object
CCD
Lens
Intermediate Image
Wave-front Coding Optical Element
Phase Surface
Image Processing
Weiner Filter
Output Image
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Wave-front Coding Imaging System
PSFs
Object
CCD
Lens
Intermediate Image
Wave-front Coding Optical Element
Image Processing
Weiner Filter
Output Image
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Why Wave-front Coding?
Wave-front
CCD
Object
Lens
Wave-front
CCD
Object
Lens
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Applications Extended Depth of Field Imaging
Traditional System Image
Extended Depth of Field Image
Traces through both images
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Applications Extended Depth of Field Imaging
W. T. Cathey and E. Dowski, A new paradigm for
imaging systems, Appl. Opt. 41, 6080 (2002).
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Applications Actuator Images
Traditional Image
(a-d)Traditional Image (e) Wave-front Coded Image
Wave-front Coded Image
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Applications Fluorescence Imaging
Wave-front Coded Image
Traditional System Image
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Applications Achromatic Imaging
Traditional System Image
Wave-front Coded Image
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Kenneth Kubala, Edward Dowski, and W. Cathey
,Reducing complexity in computational imaging
systems, Optics Express, Vol. 11, Issue 18, pp.
2102-2108
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Applications Liquid Lens with Wave-front Coding
Chir-Weei Chang and Yung-Lin Chen Using liquid
lens in wavefront coded imaging system, Proc.
SPIE, Vol. 7061, 70610O (2008)
DOI10.1117/12.794930 .
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System PSFs
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Images of Liquid Lens System
Images of Liquid Lens System with Wavefront
Coding