Method of detecting two-dimensional codes

Details Method of detecting two-dimensional codes Method of detecting two-dimensional codes

2006-05-22

2008-09-23

Chaudry, Mujtaba K. (Department: 2112)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C382S312000

Reexamination Certificate

active

07428688

ABSTRACT:
A method of detecting two-dimensional codes using a plurality of light and dark data bits arranged two-dimensionally. The method includes detecting the code as a gray scale value image, splitting the detected gray scale value image into image areas corresponding to the individual data bits, determining a binarizing threshold representing a specific gray scale value for the image areas, carrying out a respective binarizing of the gray scale value of the individual image areas by means of a binarizing threshold to produce a bit sequence which represents the data bits and consists of the values 0 and 1, supplying the bit sequence to an error correction algorithm to recognize and/or correct bit errors within the bit sequence, identifying uncertain image areas whose gray scale values each lie close to the binarizing threshold, and taking the uncertain image areas into special account in the error correction.

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