Patent ID: 8004209
Filing Date: 2011-08-23
Classification: H04N,H05B

Abstract:
1. A method of controlling a temporal variation of light emitted by an illumination system ( 65 ) from light having a start color point ( 14 , S) to light having a target color point ( 12 , T, T 1 , T 2 ), the start color point ( 14 , S) and target color point ( 12 , T, T 1 , T 2 ) comprising start and target color coordinates, respectively, in a first color space (XYZ, RGB vid , RGB ill ) which is perceptually non-uniform, the method comprising the steps of: converting the start and target color coordinates to converted start and target color coordinates, respectively, in a second color space (Lab, Lch) which is a color space perceptually more uniform to the human visual system than the first color space (XYZ, RGB generating an intermediate color point ( converting the converted intermediate color coordinates from the second color space (Lab, Lch) to intermediate color coordinates in the first color space (XYZ, RGB