ELECTRONIC WATERMARK INSERTER, ELECTRONIC WATERMARK DETECTOR, ELECTRONIC WATERMARK INSERTING METHOD AND ELECTRONIC WATERMARK DETECTING METHOD TO BE USED THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide an electronic watermark inserter capable of improving the secrecy of an inserted electronic watermark. SOLUTION: A video analyzer 3 analyzes an input image 101, determines the insertion strength of the electronic watermark to be inserted for each pixel of the input image 101 and outputs insertion strength information 104 to an electronic watermark inserter 1 and a deviation information pattern inserter 2. According to the insertion strength information 104, the electronic watermark inserter 1 inserts an electronic watermark pattern 105 stored in an electronic watermark pattern storage 4 into the input image 101. According to the insertion strength information 104, a key information pattern 106 stored in a key information pattern storage 5 is inserted into a processing image 102, in which the electronic watermark pattern is inserted, and outputted to the outside by the key information pattern inserter 2.