ELECTRONIC WATERMARK INSERTING METHOD, ELECTRONIC WATERMARK INSERTING APPARATUS, ELECTRONIC WATERMARK INSERTING PROGRAM, ELECTRONIC WATERMARK DETECTION METHOD, ELECTRONIC WATERMARK DETECTING APPARATUS, ELECTRONIC WATERMARK DETECTION PROGRAM, DATA TRANSMISSION METHOD, DATA TRANSMISSION SYSTEM, AND DATA TRANSMISSION PROGRAM

摘要

PPROBLEM TO BE SOLVED: To increase non-zero frequency components utilized for representing data among points provided to a frequency region. PSOLUTION: The electronic watermark inserting apparatus inserts non-zero frequency components representing data to an outermost circle in the frequency region and inserts non-zero frequency component for detecting rotation angles to an innermost circle. An electronic watermark detecting apparatus detects the non-zero frequency components for detecting rotation angles on the innermost circle by changing the radius to detect the angles and detects the non-zero frequency components for data on the outermost circle while changing the radius. PCOPYRIGHT: (C)2006,JPO&NCIPI