Process and apparatus for reading a dot matrix code marking on a

Details Process and apparatus for reading a dot matrix code marking on a Process and apparatus for reading a dot matrix code marking on a

1996-02-28

1999-04-06

Au, Amelia

Image analysis

Pattern recognition

Template matching

382309, 235462, G06K 903, G06K 962

Patent

active

058928464

ABSTRACT:
A process and associated apparatus can automatically read a dot matrix code marking on an article even when the marking has been partly obscured or damaged in some way. The process comprises capturing a video image of the dot matrix code and correlating points on the captured image with a mask of expected dot appearance, using a known two-dimensional correlation technique. However, the correlation is performed in accordance with certain thresholding and mask adjustment criteria to improve read reliability and map the possible dot pattern in preparation for an attempt at reading the code. After automatically reorientating the map of possible dots to a read orientation if necessary, decoding of the pattern of possible dots is then attempted by comparing it with a datum grid representing rows and columns of valid dot matrix codes. The process can output a signal affirming that a valid code has been found.

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patent: 5202552 (1993-04-01), Little et al.
patent: 5329107 (1994-07-01), Priddy et al.
patent: 5357095 (1994-10-01), Weyrauch et al.
patent: 5452373 (1995-09-01), Shou et al.

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