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Optical Engineering

Extension of subpixel augmented template matching to imperfectly rendered binary targets
Author(s): Wim M. Ruyten
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Paper Abstract

In a previous work, a new method was introduced for correlation matching of binary targets (e.g., a light, uniform target on a dark, uniform background). This new method was based on the use of an augmented search template that contains not only the occupied pixel fractions of the synthetic reference that is being located, but also the derivatives of these pixel fractions with respect to shifts of the template along the image axes. In the present work, the augmented template technique is extended to cases in which a binary target is used for image registration, but is not rendered as a binary image feature due to experimental artifacts such as specular reflection, mixed image contrast, or partial occlusion. It is shown that subpixel localization of the target can still be accomplished, by extending the concept of a single augmented template to a composite one, which consists of overlapping three-by-three subtemplates. Examples of noncomposite and composite augmented template matching are demonstrated experimentally.

Paper Details

Date Published: 1 March 2004
PDF: 9 pages
Opt. Eng. 43(3) doi: 10.1117/1.1646182
Published in: Optical Engineering Volume 43, Issue 3
Show Author Affiliations
Wim M. Ruyten, Sverdrup Technology, Inc. (United States)

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