Post on 12-Jan-2016
WAVE-FRONT CODING:A NEW PARADIGM FOR IMAGING SYSTEMSW. Thomas Cathey and Edward R. DowskiW. 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.
LensCCDObjects
Output Image
Traditional Imaging Systems
In Focus
Lens CCDObjects
Output Image
Traditional Imaging Systems
Out of Focus
Wave-front Coding
Lens CCD
ObjectsIntermediate Image
Wave-front CodingOptical Element Image
Processing
Output Image
E. R. Dowski, Jr., and W. T. Cathey, “Extended depth of field through wave-front coding,” Appl. Opt. 34, 1859–1866 1995.Imaging Systems Laboratory, Department of Electrical Engineering, University of Colorado, Boulder, Colorado 80309.
Object Lens CCD
Traditional Imaging System
Object Lens CCD
Wave-front Coding Imaging System
Wave-front CodingOptical Element
Object Lens CCD
Traditional Imaging System
Object Lens CCD
Wave-front CodingOptical Element
Wave-front Coding Imaging System
CCD
PSFs
In Focus
Out of Focus
In Focus
Out of Focus CCD
In Focus
Out of Focus
In Focus
Out of Focus
PSFs
Traditional Imaging System Wave-front Coding Imaging System
Input Signal
System
Output Signal
H
Impulse PSF
PSFs
In Focus
Out of Focus
In Focus
Out of Focus
PSFs
Traditional Imaging System Wave-front Coding Imaging System
Ambiguity Function A(u,v)
u: Spatial Frequencyψ: Misfocus Parameter
Phase Function P(x)
Spatial Frequency
Spatial Frequency
High
Low
Modulation Transfer Functions (MTFs)
Object Lens CCD
Wave-front CodingOptical Element
Wave-front Coding Imaging System
Intermediate Image
Image Processing
Output Image
PSFs
Weiner FilterPhase Surface
Object Lens CCD
Wave-front CodingOptical Element
Wave-front Coding Imaging System
Intermediate Image
Image Processing
Output Image
PSFs
Weiner Filter
Why Wave-front Coding?
Object Lens CCD
Wave-front
Object Lens CCD
Wave-front
Applications: Extended Depth of Field Imaging
Traditional System Image
Extended Depth of Field Image
Traces through both images
Applications: Extended Depth of Field Imaging
W. T. Cathey and E. Dowski, “A new paradigm for imaging systems,” Appl. Opt. 41, 6080 (2002).
Applications: Actuator Images
(a-d)Traditional Image(e) Wave-front Coded Image
Traditional Image
Wave-front Coded Image
Applications: Fluorescence Imaging
Traditional System Image Wave-front Coded Image
Applications: Achromatic Imaging
Traditional System Image
Wave-front Coded Image
Kenneth Kubala, Edward Dowski, and W. Cathey ,”Reducing complexity in computational imaging systems,” Optics Express, Vol. 11, Issue 18, pp. 2102-2108
Applications: Liquid Lens with Wave-front CodingChir-Weei Chang and Yung-Lin Chen “Using liquid lens in wavefront coded imaging system,” Proc. SPIE, Vol. 7061, 70610O (2008); DOI:10.1117/12.794930 .
Images of Liquid Lens System
Images of Liquid LensSystem with Wavefront Coding