Multiple threshold encoding of machine readable code

Details Multiple threshold encoding of machine readable code Multiple threshold encoding of machine readable code

1991-08-19

1994-01-11

Hajec, Donald

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Records

Particular code pattern

235454, 235456, 358429, 358455, G06K 1906, G06K 710

Patent

active

052784002

ABSTRACT:
A method and apparatus for applying coded data to a substrate and decoding the data in which the data are encoded in cells having a determined number of pixels. The pixels are coded, preferably by binary printing, in accordance with the number of coded pixels and not their position. In decoding of the cells, the gray scale levels of the pixels are sensed, and converted to digital signals. The digital signals are summed, for all of the pixels of the cell, and compared with multiple threshold levels in order to recover the data.

REFERENCES:
patent: 4708920 (1987-11-01), Orensteen et al.
patent: 4788598 (1988-11-01), Ochi et al.
patent: 4790566 (1988-12-01), Boissier et al.
patent: 4822986 (1989-04-01), Guthmueller et al.
patent: 4939354 (1990-07-01), Priddy et al.
patent: 5008950 (1991-04-01), Katayama et al.

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