×

Information-embedding apparatus, encoder, tamper-detecting apparatus, information-embedding method, tamper-detecting method, and recording medium having program recorded therein for executing both of the methods

  • US 20060013488A1
  • Filed: 08/08/2003
  • Published: 01/19/2006
  • Est. Priority Date: 08/09/2002
  • Status: Active Grant
First Claim
Patent Images

1. An information-embedding apparatus comprising:

  • a characteristic information-calculating unit operable to calculate characteristic information in accordance with a frequency coefficient at a first frequency domain among frequency coefficients obtained by frequency transformation of a digital image signal; and

    an information-embedding unit operable to embed the characteristic information into a frequency coefficient at a second frequency domain among the frequency coefficients obtained by the frequency transformation of the digital image signal, thereby providing embedded data, the second frequency domain being different from the first frequency domain.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×