Patent ID: 8072866

Claim:
A marker selecting method comprising: modulating information data in a two-dimensional manner in accordance with a specified modulation rule, to thereby obtain modulation data; generating at least one first marker in accordance with the modulation rule, each first marker defining a position reference for correcting a position-shift of the modulation data in a recording/reproducing procedure; preparing a first verification image and a second verification image and calculating a first correlation value which indicates a correlation between a template image and the first verification image and a second correlation value which indicates a correlation between the template image and the second verification image, the first verification image including a second marker having a pattern which is obtained by shifting a pattern of a generated first marker by a predetermined pixel amount, the second verification image including the modulation data, and the template image indicating the pattern of the first marker; and selecting one of the first markers having a pattern by which a peak of the first correlation value in the first verification image is greater than a peak of the second correlation value in the second verification image.