INSERTING/EXTRACTING METHOD OF DIGITAL WATERMARK AND DEVICE THEREOF

摘要

PURPOSE: A digital watermark inserting/extracting method and a device thereof are provided to insert data such as logo to an input image by converting to a binary data and extract the watermark in the shape of logo visually. CONSTITUTION: A digital watermark inserting/extracting device includes a data conversion element(310) for converting an input data of a predetermined format to display in the watermark to a binary data, pseudo noise code generating element(320) for generating a random number as a pseudo noise code according to a predetermined key value, a multiplying element(330) for multiplying the random number with a predetermined constant according to the binary data, and an adder(130) for adding the watermark generated by the multiplication with the input image.