Recording method and decoding method for digital information usi

Image analysis – Applications

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G06K 900

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active

057455899

ABSTRACT:
A small block having a particular configuration that fills up an information recording area without clearances is set. The small block made up by giving marks of different values to cells arrayed in a direction of at least one row and column is selected as a modulation block. A primary pattern corresponding to recording-object information is extracted in the units of small blocks, the extracted patterns are associated with the modulation pattern in the units of cells in one-to-one correspondence, and their exclusive-ORs are calculated respectively. A secondary pattern is recorded by a process that small blocks composed of marks representing the values of the exclusive-ORs are arrayed in the units in order in the information recording area.

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