Patent ID: 7611067

Claim:
A printed material comprising: a first coded pattern area repeatedly formed on a recording material as a background image, the first coded pattern area containing image identification information; and a second coded pattern area recorded as a background image on the recording material, the second coded pattern area containing a coordinate value, wherein: the first coded pattern area and the second coded pattern area are provided to convey information about an image formed on the recording material; the first coded pattern area is composed of a first plurality code blocks, each of the code blocks having one of a plurality of pattern configurations, each of the pattern configurations has a corresponding numerical code value; the numerical code values of the code blocks in the first coded pattern area are further encoded, and the further encoding of the numerical code values of the code blocks in the first coded pattern area including at least (1) a first step of adding the numerical code value of each code block to a numerical code value obtained from a code block in the second coded pattern area and (2) a second step of replacing the numerical code value of the code block in the first coded pattern area with a numerical code value derived in part from the process of the first step.