Background pattern image generating method

摘要: A block where basic units of a background pattern are arranged two-dimensionally is formed so as to stably read buried information from printed pattern. Binary or multivalued number assigned the express information. When binary (bit) made up patterns in double size, error correction can be if an occurs only one while reading block. In each pattern, diagonal lacking its center part drawn, and isolated dots placed along other diagonal. With this, ensuring stability after by scanner, uniformness appearance object ensured.