- 국가/구분
- United States(US) Patent 등록
- 국제특허분류(IPC7판))
- G09G-005/10 IPC 상세 G06T-011/20 IPC 상세 G06T-011/40 IPC 상세
- 미국특허분류(USC)
- 345/147 ; 345/443 ; 345/432
- 출원번호
- US-0037412 (1998-03-10)
- 발명자/주소
-
McNamara Robert S.
McCormack Joel J.
Jouppi Norman P.
Claffey James T.
Knittel James M.
Seiler Larry D.
- 출원인/주소
-
Compaq Computer Corporation
- 대리인 /주소
- Sherry
- 인용정보
-
피인용 횟수 : 20
인용 특허 : 6
초록
A computer graphics system renders an image on a display device using improved pre-filtering techniques that minimize aliasing artifacts in the image, particularly at the endpoints of lines. To anti-alias the image, a plurality of edges are placed near a line in the image. An edge function represents the edge. This edge function is multiplied by a scale factor to produce a distance function. This scale factor is the reciprocal of the Euclidean length of the line. The distance function is evaluated to determine the distance of selected pixels from each edge in units of pixels. These distances determine the intensity value for each selected pixel. Pixels on or beyond an edge, with respect to the line, are given a minimum intensity value; pixels inside all edges are given intensity values corresponding to their distances from the edge. An intensity function describing a relationship between pixel distances from the edges and their corresponding intensity values is developed. The intensity function can be implemented in a look-up table or approximated with hardware.
대표청구항
[ We claim:] [1.]1. A computerized method for rendering an image defined by pixels, comprising the steps of:placing a mask a predetermined distance outside of a line of the image, the mask including a plurality of edges which bound the line, each of the plurality of edges being defined by distance evaluators;selecting a pixel within the mask;determining a distance value representing a distance of the selected pixel from a corresponding edge of the mask; anddetermining an intensity value for the selected pixel based upon the distance value, the determined intensity value improving the perceived quality of the images by reducing aliasing artifacts when the selected pixel is intensified according to the determined intensity value.
이 특허에 인용된 특허(6)
IPC분류
문의처
- 이메일
- helpdesk@kisti.re.kr
- 전화
- 080-969-4114