Subpixel localization of synthetic references in digital images by use of noncomposite and composite augmented templates

Wim M. Ruyten

doi:10.1117/12.467975

22 May 2002 Subpixel localization of synthetic references in digital images by use of noncomposite and composite augmented templates

Wim M. Ruyten

Author Affiliations +

Proceedings Volume 4667, Image Processing: Algorithms and Systems; (2002) https://doi.org/10.1117/12.467975
Event: Electronic Imaging, 2002, San Jose, California, United States

Abstract

A new method is presented for the localization of synthetic references (SRs) in digital images based on normalized correlation. An augmented search template is used, which consists not only of occupied pixel fractions of the SR, but also of derivatives of these fractions with respects to shifts along the image axes. Resulting correlation values are higher than those based on standard correlation, especially for small SRs and unfavorable subpixel displacements between template and scene. The augmented template is also used to determine the location of the SR to subpixel accuracy. The precision of this determination is affected less by systematic and random error than is the case for centroiding or sampled correlation interpolation, and can be estimated explicitly from the calculated correlation value. Numerical examples are given and the algorithm is demonstrated on data taken in wind-tunnel tests under different lighting conditions. In particular, the situation is considered in which imaged SRs display poor contrast, mixed contrast, or are affected by other experimental artifacts such as specular reflection and partial occlusion. In these cases, successful subpixel localization is accomplished by treating the template as a composite set of overlapping 3-by-3 subtemplates.

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Wim M. Ruyten "Subpixel localization of synthetic references in digital images by use of noncomposite and composite augmented templates", Proc. SPIE 4667, Image Processing: Algorithms and Systems, (22 May 2002); https://doi.org/10.1117/12.467975

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