26 July 1993 High-pass matched filtering for optical character recognition with character-background contrast invariance
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Proceedings Volume 1983, 16th Congress of the International Commission for Optics: Optics as a Key to High Technology; 19834R (1993) https://doi.org/10.1117/12.2308590
Event: 16th Congress of the International Commission for Optics: Optics as a Key to High Technology, 1993, Budapest, Hungary
Abstract
Contrast invariant recognition for multiobject scenes by means of a high-pass filter (HPF) combined with a phase only filter (POF) or a classical matched filter (CMF) is theoretical and numerically analysed. Objects with two kinds of contrast variations connected with the background level and signal amplitude are considered.
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María S. Millán, María S. Millán, } "High-pass matched filtering for optical character recognition with character-background contrast invariance", Proc. SPIE 1983, 16th Congress of the International Commission for Optics: Optics as a Key to High Technology, 19834R (26 July 1993); doi: 10.1117/12.2308590; https://doi.org/10.1117/12.2308590
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