Method and apparatus for calculating a chroma key of an object evolving on a coloured background

Abstract

Abstract The method involves separating a subject image from a background area and defining a subject zone, a background area and a transition zone. The electronic image coordinates are transformed into polar coordinates and calculations performed (10-15). These calculations allow the size of the coloured background to be defined. The size is defined by a volume which is in the form of an open cone with an angle alpha and which has an axis of symmetry passing through a chromatic and luminance null in the colour space and a point representing the background colour.

Inventors

• 👤 Alain Demay
• 👤 Michel Le Lan

Bibliographic Details