Image analysis – Image enhancement or restoration – Image filter
Reexamination Certificate
2005-09-06
2005-09-06
Dastouri, Mehrdad (Department: 2623)
Image analysis
Image enhancement or restoration
Image filter
C382S274000, C382S205000
Reexamination Certificate
active
06941026
ABSTRACT:
Visual information regarding intensity and intensity-based gradient information is used in a multi-step process for accurately locating and decoding an encoded visual symbol matrix. A symbol is preprocessed with filtering and morphology. A set of coarse locations of candidate symbols is filtered according to coarse geometric criteria to determine which image locations are most viable. Depending upon the symbol type, and information about the edges of the symbols, additional symbol-specific filtering and refinements can be applied or skipped. For 2D matrices filtering according to intensity variance criteria is followed by an edge-locating refinement and by identifying finder patterns and timing patterns. Once finder patterns and timing patterns are precisely located, the data region is decoded. Where a data region does not decode validly, another pass is run, using the non-morphed image, resulting in an overall saving of time, as rejections may require operator intervention.
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Desai Ranjit
Nadabar Sateesh Gopalakrishna
Cognex Corporation
Dastouri Mehrdad
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