An investigation of methods for determining depth from focus
Ens, J.
Lawrence, P.
Intense Technologies, Richmond, Ont.;
This paper appears in: Pattern Analysis and Machine Intelligence, IEEE Transactions on
Publication Date: Feb 1993
Volume: 15,
Issue: 2
On page(s): 97-108
ISSN: 0162-8828
References Cited: 32
CODEN: ITPIDJ
INSPEC Accession Number: 4396873
Digital Object Identifier: 10.1109/34.192482
Current Version Published: 2002-08-06
Abstract
The concept of depth from focus involves calculating distances to
points in an observed scene by modeling the effect that the camera's
focal parameters have on images acquired with a small depth of field.
This technique is passive and requires only a single camera. The most
difficult segment of calculating depth from focus is deconvolving the
defocus operator from the scene and modeling it. Most current methods
for determining the defocus operator employ inverse filtering. The
authors reveal some fundamental problems with inverse filtering:
inaccuracies in finding the frequency domain representation, windowing
effects, and border effects. A general, matrix-based method using
regularization is presented, which eliminates these problems. The new
method is confirmed experimentally, with the results showing an RMS
error of 1.3%
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