Video processing

摘要

A method and apparatus for keying foreground and background areas of an image or objects within an image is described. The selected object or area is differentially lit with key light having a selected characteristic, such as a selected colour property or temporal variation. A first image is formed of the scene, and a key signal is derived from the image based on detection of the key light. A second image of the scene may also be formed in which the effect of the key light on the object or area is reduced. The method may allow objects or areas to be keyed into or out of an image.