Image recognition edge detection method and system

Details Image recognition edge detection method and system Image recognition edge detection method and system

1991-02-07

1992-05-19

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

382 8, 382 48, G06K 900

Patent

active

051154773

ABSTRACT:
A system and method for delineating the edges of an object in an image frame formed of a two dimensional array of pixels represented by a plurality of gray scale values representing the gray scales of the pixels. A reference contrast level based on the distribution of contrast levels between contiguous pixels is established, and the contrast levels of pairs of pixels in square groupings of four contigous pixels are compared with the reference contrast level. A two dimensional array of elements corresponding to the arrangement of the square groupings of pixels is formed in which each element has a first value only if the contrast level between a pair of pixels in a square grouping is greater than the reference contrast level.

REFERENCES:
patent: 4220972 (1980-09-01), Geokezas et al.
patent: 4519041 (1985-05-01), Fant et al.
patent: 4561104 (1985-12-01), Martin
patent: 4606066 (1986-08-01), Hata et al.

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