Patent ID: 6186405
Filing Date: 2001-02-13
Classification: G06K

Abstract:
An optically readable dot code including a plurality of blocks arranged adjacent to each other, each block comprising:a marker section for recognizing the block,a data dot pattern section as a modulation area which is modulated to be structurally discriminated from the marker section and to represent modulated information, and which includes a plurality of dots arranged such that each bit value of the modulated information is represented by a corresponding dot; anda block header section as a non-modulation area which contains block address data indicative of an address assigned to the block;wherein the marker section, the data dot section and the block header section are positioned in a predetermined arrangement with respect to each other; andwherein, in addition to the block address data, the block header section further includes (i) information indicative of a modulation method applied to the modulated information represented by the data dot pattern section of the block, and (ii) restoration parameter data necessary to process the modulated information to restore the modulated information to predetermined perceptible information.