Patent ID: 8305633

Claim:
A registering apparatus comprising: a first image data acquiring unit that acquires first image data from a predetermined first region on a recording medium; a second image data acquiring unit that acquires second image data from a second region that includes the first region; a third image data acquiring unit that acquires third image data from a third region that does not include the first region on the recording medium and differs from the second region when a correlation value between the second image data and the first image data is equal to or greater than a predetermined first threshold value; and a registering unit that determines whether a correlation value between the third image data and the first image data is less than a second threshold value and, if the correlation value is less than the second threshold value, registers the first image data as registration data that are image data to be used in authentication of the recording medium, and if the correlation value is equal to or greater than the second threshold value, does not register the first image data as the registration data.