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Optical Engineering

Sub-pixel accuracy location estimation from digital signals
Author(s): Jean-Pierre Fillard
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Paper Abstract

Identification of the spatial location of images in 1-D, 2-D, or even 3-D situations is often a requirement from sampled and digitized images which refer to regular independent linearly distributed pixels. The high-precision evaluation of the position requires interpolation calculations between the spatial samples to obtain a precision better than the geometrical pitch of the elementary pixels. Two calculation methods are discussed to attain such a subpixel accuracy: The first one proceeds from the well-known method of calculating the "centroid" of the samples in the direct space; the second one relies on the retrieval of the Fourier phase frequency dependence in the frequency domain. Both specifications are evaluated and the specific case of a 3-D signal is discussed. Both methods are independent of the analytical model for the function.

Paper Details

Date Published: 1 November 1992
PDF: 7 pages
Opt. Eng. 31(11) doi: 10.1117/12.59956
Published in: Optical Engineering Volume 31, Issue 11
Show Author Affiliations
Jean-Pierre Fillard, Univ. de Montpellier II (France)


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