Method and device for providing cartoon outline in three-D video image system

Application Number  00128840 Application Date  2000.09.22
Publication Number  1316723 Publication Date  2001.10.10
Priority Information   1999/12/21 US 09/468,109; 1999/9/24 US 60/155,660  
Applicant(s) Name  Mintendo Co., Ltd.  
Inventor(s) Name  Yasumoto Yoshitaka  
Patent Agency Code  31100 Patent Agent  shen zhaokun
AbstractIn a 3D computer graphics system such as a 3D home video game console, efficient techniques for generating non-photorealistic effects such as cartoon outlining involve generating and displaying border lines at object edges based on contents of a pixel memory. Some techniques use depth (Z) values to determine which pixels are located at object edges, and selectively blend border coloration into those pixels which are then displayed. Object edges are located by comparing pixel depth values with neighboring pixel depth values (e.g., calculating a 'distance' value based on the absolute values of the distance(s) between a pixel's depth and depths of neighboring pixels). A desired border line color is blended into the pixel's color value based on the calculated distance value.