Patent ID: 7403209
Filing Date: 2008-07-22
Classification: G06T

Abstract:
1. A method of rendering an image, said image being formed by compositing one or more graphical primitives according to a compositing tree, said compositing tree comprising a plurality of nodes each representing a graphical primitive of said image or an operation for combining said graphical primitives, said method comprising the steps of: representing at least one video frame of a video sequence by a first image node; representing at least one video frame of the video sequence by a second image node; compositing the video frame represented by the first image node with a corresponding path graphical primitive for extracting a predetermined shape of an image represented by a first primitive node of said compositing tree, according to at least one of an in compositing operation and an out compositing operation represented by a first composite node of said compositing tree, in order to generate a first composite image; compositing the video frame represented by the second image node with a further corresponding path graphical primitive represented by a second primitive node of said compositing tree, according to the at least one compositing operation represented by a second composite node of said compositing tree, in order to generate a second composite image; compositing the first and second composite images together, according to at least one of a plus compositing operation and an over compositing operation represented by a third composite node of said compositing tree, in order to render said image, wherein one or more attributes of said video frames are changeable by changing an attribute of the third composite node; and displaying said image on a display device.