Method of embeding and extracting digital watermark for authenticating digitial image

摘要

PURPOSE: A method for inserting and extracting digital watermarks for digital video authentication is provided to realize digital watermarks robust against transfer of an image or cropping. CONSTITUTION: An inputted image is converted into a predetermined format(S10). A template formed of pseudo noise sequence is inserted into the converted image(S20). The inputted image is divided by detection blocks, and the detection blocks are divided into a feature value block representing features of the inputted image, and a watermarking block to which watermarks are inserted(S30). The feature values representing the features of the inputted image are extracted from the detection blocks representing the feature value block(S40). The feature values are inserted into the watermarking block as watermarks(S50).