05530759 is referenced by 366 patents and cites 6 patents.

A system for placing a visible "watermark" on a digital image is disclosed, wherein an image of the watermark is combined with the digital image. The pixels of the watermark image are examined, and for each pixel whose value is not a specified "transparent" value, the corresponding pixel of the original image is modified by changing its brightness but its chromaticities. This results in a visible mark which allows the contents of the image to be viewed clearly, but which discourages unauthorized use of the image.

Title
Color correct digital watermarking of images
Application Number
8/381807
Publication Number
5530759
Application Date
February 1, 1995
Publication Date
June 25, 1996
Inventor
Frederick C Mintzer
Shrub Oak
NY, US
Karen A Magerlein
Ossining
NY, US
Gordon W Braudaway
Yorktown Heights
NY, US
Agent
Richard M Ludwin
Assignee
International Business Machines Corporation
NY, US
IPC
H04K 1/00
View Original Source