Digital watermark information superimposing method, digital...

Details Digital watermark information superimposing method, digital... Digital watermark information superimposing method, digital...

H - Electricity

04

L

H04L 9/32 (2006.01) G06T 1/00 (2006.01) H04N 5/91 (2006.01) H04L 12/64 (2006.01)

Patent

CA 2289406

A method and apparatus for superimposing digital watermark information to a video signal are provided. The method comprises the steps of determining before conversion a format of a video signal that is to have digital watermark information superimposed thereon and determining a format of the video signal after conversion from said video signal before conversion. A unit block size of the video signal before conversion is then determined that includes a whole number of pixels in both the horizontal and vertical directions so that when said video signal before conversion is converted to the format of the video signal after conversion, a resulting unit block size of said video signal after conversion also includes a different whole number of pixels in both the horizontal and vertical directions. The conversion is accompanied selectively by an interpolating process or a thinning process in the horizontal direction or the vertical direction or a time direction between consecutive frames or fields.

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