Composing layered synthetic graphics filters with limited scopes of operation
US6043824A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 27, 1997 |
| Grant date | Mar 28, 2000 |
| Priority date | — |
| Expiry date | Jun 27, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T15/503
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A computerized two-dimensional illustration system composes an image of a scene with layered synthetic graphics filters or lenses. The scene is defined by an ordered list of shapes. Some of the shapes in the ordered list of shapes are lenses. Each lens is a shape that has a fill color which is an operator rather than a constant. The operator of a selected lens performs a filtering function on the shapes ordered below it in the list of shapes. To compose a selected lens in the scene, the system computes an under-list of shapes for the selected lens. The under-list of shapes identifies shapes in the ordered list of shapes to which the filtering function of the selected lens may apply. After computing the under-list for a selected lens, the system freezes the shapes in the under-list and applies the filtering function of the selected lens to the shapes in the under-list. When a lens is frozen, it is replaced with a list of shapes that are formed independently of other shapes in the list of shapes. The scope of operation of the selected lens can be reduced by grouping the selected lens with other shapes in the scene as either a lens-in cluster or a lens-out cluster. A lens-in cluster l…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.