Extended Depth of Field Through Wavefront Coding
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Imaging Systems Laboratory,
Department of Electrical Engineering
University of Colorado,
Boulder, Colorado 80309
Extended Depth of Field Through Wavefront Coding
Edward R. Dowski, Jr. and W. Thomas Cathey
Tue Oct 31 12:24:24 MST 1995
Abstract:
We have designed an
optical/digital system that delivers near
diffraction limited imaging performance with a large depth of field.
This system is the standard incoherent
optical system modified by a phase mask, with digital processing of the
resulting intermediate image.
The phase mask
alters or codes the
received incoherent wavefront in such a way that the PSF and OTF do not appreciably
change as a function of misfocus.
Focus independent digital filtering of the intermediate image is used to
produce a combined optical/digital system
that has a nearly diffraction limited PSF. This high resolution extended
depth of field is obtained through the expense of increased dynamic range
of the incoherent system. We use both the ambiguity function
and the method of stationary phase to design these phase masks.
Key Words: Extended Depth of Field, Extended Depth of Focus, Wavefront Coding
Ed Dowski
Tue Oct 31 12:23:40 MST 1995