| CPC G06K 7/1417 (2013.01) [G06K 19/06037 (2013.01)] | 14 Claims |
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1. A two-dimensional code comprising a plurality of lines arranged in a second direction at an interval, each line including a plurality of cells that indicate a plurality of bits and are arranged in series in a first direction orthogonal to the second direction, wherein
each of the plurality of cells is either a first data cell indicating a first value out of two values that the bits indicate, or a second data cell indicating a second value out of the two values that the bits indicate,
the first data cell includes a first density region indicating the first value at a first position in the second direction,
the second data cell includes a second density region indicating the second value at the first position, and a third density region adjacent to the second density region in the second direction,
a difference in density between the first density region and the second density region is greater than a difference in density between the first density region and the third density region,
in each of the plurality of lines, positions of opposite ends, in the second direction, of the first density region are aligned with positions of opposite ends, in the second direction, of the second density region, and
the third density region is arranged adjacent to opposite sides, in the second direction, of the second density region, and a width in the second direction of each of the third density regions arranged adjacent to the opposite sides of the second density region is substantially equal to half a width in the second direction of the second density region.
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