Finder pattern for optically encoded machine readable symbols

Details Finder pattern for optically encoded machine readable symbols Finder pattern for optically encoded machine readable symbols

1990-10-30

1993-02-23

LaRoche, Eugene R.

Registers

Records

Particular code pattern

235456, 235487, 283 93, 380 51, 382 56, G06K 1906, G06K 710, G06K 1900, G06K 936

Patent

active

051892928

ABSTRACT:
An optically encoded information bearing label containing a two dimensional array of data cells includes a finder pattern comprising a plurality of spots arranged in a predetermined geometric pattern substantially analogous to the predetermined geometric pattern of said two dimensional array of data cells. The finder pattern is detected by first scanning the image area to detect spots. The locations of detected spots are compared to the known geometry of the finder pattern in order to provide for rapid and reliable finding of the finder pattern and the information bearing label. Additionally, the detected finder pattern spots provide information for decoding the two dimensional data array in order to compensate for label magnification, tilt and other distortions.

REFERENCES:
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patent: 3200373 (1965-08-01), Rabinow
patent: 3513320 (1970-05-01), Weldon
patent: 3603728 (1971-09-01), Arimura
patent: 3693154 (1972-09-01), Riley
patent: 3801775 (1974-04-01), Acker
patent: 4286146 (1981-08-01), Uno et al.
patent: 4874936 (1989-10-01), Chandler et al.
patent: 4896029 (1990-01-01), Chandler et al.
patent: 4939354 (1990-07-01), Priddy et al.
USD-5 Automatic Identification Manufacturers Uniform Symbol Description. Presence/Absence Code.
Material Handling Institute Pittsburgh Pa 15238 1982.

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