METHOD FOR INSERTING ADDITIONAL INFORMATION, METHOD FOR DETECTING ADDITIONAL INFORMATION, DEVICE FOR INSERTING ADDITIONAL INFORMATION AND DEVICE FOR DETECTING ADDITIONAL INFORMATION

摘要

FIELD: water mark technologies. ^ SUBSTANCE: method includes generation of plural portions of additional information. Said plurality is converted to information of electronic water mark. Dimensions of insertion areas are set dependent on value of information. Information is inserted on basis of respective control signal. ^ EFFECT: higher efficiency. ^ 5 cl, 35 dwg