Decoding device for two-dimensional codes by using first or seco

Details Decoding device for two-dimensional codes by using first or seco Decoding device for two-dimensional codes by using first or seco

1991-08-26

1994-01-04

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Recording apparatus

3582612, H04N 100, H04N 140

Patent

active

052765261

ABSTRACT:
A decoding device for two-dimensional codes employs a first serial reference line signal which assumes the value "1" only at the change point from black to white, and a second reference line signal which assumes the value "1" only at the change point from white to black, either of which is selected according to the color of the start pixel. The end of a reference line can be identified by the value "1" in both reference line signals. The decoding device can thus achieve high-speed development of two-dimensional codes without a large-scale logic circuit.

REFERENCES:
patent: 4097903 (1978-06-01), Nakagome et al.
patent: 4163260 (1979-07-01), Hisao et al.
patent: 4212036 (1980-07-01), Nakagome et al.
patent: 4982293 (1991-01-01), Ishii
patent: 5095512 (1992-03-01), Roberts et al.

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