Method and system for identifying objects in an image

Details Method and system for identifying objects in an image Method and system for identifying objects in an image

2005-06-28

2005-06-28

Werner, Brian (Department: 2621)

Image analysis

Pattern recognition

Feature extraction

C382S218000, C382S266000

Reexamination Certificate

active

06912309

ABSTRACT:
Methods and apparatus for identifying objects in an image include processing the image with a gradient operator to produce a gradient magnitude and direction for each pixel. A number of different gradient directions in a portion of the processed image is determined. The portion of the processed image is identified as an object if the number of different gradient directions exceeds a threshold number of gradient directions. The determination of the gradient directions can be simplified by employing a lookup table.

REFERENCES:
patent: 5867592 (1999-02-01), Sasada et al.
patent: 5936674 (1999-08-01), Kim
patent: 5940539 (1999-08-01), Kondo et al.
patent: 6208763 (2001-03-01), Avinash
patent: 6658145 (2003-12-01), Silver et al.
patent: 6661842 (2003-12-01), Abousleman
patent: 6697537 (2004-02-01), Norimatsu

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