DIGITAL WATERMARK EMBEDDING DEVICE, DIGITAL WATERMARK DETECTING DEVICE, DIGITAL WATERMARK EMBEDDING METHOD, DIGITAL WATERMARK DETECTING METHOD AND PROGRAM

• Main Authors: YAMAMOTO KANA, KATAYAMA ATSUSHI, TSUTSUGUCHI KEN, ANDO SHINGO, TANIGUCHI YUKINOBU
• Format: Patent
• Language: English
• Published: 03.02.2014
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; PICTORIAL COMMUNICATION, e.g. TELEVISION

PROBLEM TO BE SOLVED: To provide a digital watermark embedding device capable of embedding much more information without reducing reliability in detection of a digital watermark and also without making the digital watermark conspicuous visually.SOLUTION: In a digital watermark embedding device 1, an embedding sequence generating section 10 generates an information sequence by replacing embedding information with any values which are made correspondent beforehand, included in K kinds of different values (K is an integer equal to or more than 3) which are changed in accordance with displacement. Based on a diffusion sequence, the generated information sequence is displaced, thereby generating the embedding sequence. A pattern superimposing section 40 superimposes a digital watermark into an input signal based on the embedding sequence and outputs a watermark embedded signal I'.