Method and apparatus for embedding text watermark

摘要

A text is inserted as watermark into digital data by using wavelet transform and discrete cosine transform. The method of inserting a text into digital data comprises the steps of: converting said digital data to have a 2-dimensional image format; converting the text to have the 2-dimensional image format; and inserting the converted text into the converted digital data by using DCT and DWT. The text is extracted from the text watermarked digital data by recovering the converted text of the 2-dimensional format using the text watermarked digital data and the original digital data; and extracting the text form the recovered text of the 2-dimensional format.