Patent ID: 8397999

Claim:
A two-dimensional code which is present on an object and formed to have a rectangular region delineated by a plurality of borders differentiated from a background on the object, comprising: a plurality of code blocks including a plurality of data code blocks and a plurality of error-correction code blocks, the data code blocks being blocks in which data are coded, the error-correction code blocks being for correcting an error in the data code blocks, the data code blocks and the error-correction code blocks being composed of a plurality of cells which are aggregated; a first specific pattern used to specify the positions of the cells; and a second specific pattern used to distinguish the code blocks from the background on the object, wherein the code blocks, the first specific pattern and the second specific pattern are arranged in the rectangular region, the first specific pattern is located at a specified corner of the rectangular region, the second specific pattern is located along one or more borders of two first borders along which the first specific pattern is located, the second specific pattern being adjacent to the first specific pattern, the first borders being part of the borders of the rectangular region, the error-correction code blocks are located along second borders which are different from the one or more borders of the two first borders, the second borders being part of the borders of the rectangular region, and one or more of the error-correction code blocks are arranged along each of the second borders.