초록 ▼

A digital watermark is inserted into multimedia data containing two image fields by placing a positive watermark into a first field and a negative watermark into a second field. The positive watermark and negative watermark are opposite of one another. The two fields can be interlaced fields of a fi

A digital watermark is inserted into multimedia data containing two image fields by placing a positive watermark into a first field and a negative watermark into a second field. The positive watermark and negative watermark are opposite of one another. The two fields can be interlaced fields of a field-based video signal or alternate rows of a frame-based video signal. The watermark is extracted from field-based watermarked data by separating the watermarked data into two fields and subtracting one of the fields from the other field to generate a watermarked signal. The resultant watermarked signal is processed in a conventional manner to extract and detect the watermark.

대표청구항 ▼

[ What is claimed is:] [1.] A method of inserting a watermark into data comprising the steps of:receiving data to be watermarked in the form of a first and a second field;inserting a first watermark into a first field for generating a first watermarked field;inserting a second watermark, opposite of

[ What is claimed is:] [1.] A method of inserting a watermark into data comprising the steps of:receiving data to be watermarked in the form of a first and a second field;inserting a first watermark into a first field for generating a first watermarked field;inserting a second watermark, opposite of the first watermark, into a second field for generating a second watermarked field; andcombining said first watermarked field and said second watermarked field for generating field-based watermarked data.