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1. (WO2018042283) A METHOD OF CONTROLLING LIGHTING SOURCES, CORRESPONDING SYSTEM AND COMPUTER PROGRAM PRODUCT

Pub. No.:    WO/2018/042283    International Application No.:    PCT/IB2017/055033
Publication Date: Fri Mar 09 00:59:59 CET 2018 International Filing Date: Tue Aug 22 01:59:59 CEST 2017
IPC: H04N 1/60
Applicants: OSRAM GMBH
OSRAM S.P.A. - SOCIETA' RIUNITE OSRAM EDISON CLERICI
Inventors: ALFIER, Alberto
LI, Xiaolong
Title: A METHOD OF CONTROLLING LIGHTING SOURCES, CORRESPONDING SYSTEM AND COMPUTER PROGRAM PRODUCT
Abstract:
Colour points in a gamut area of a colour space, for reproduction by a plurality of e.g. LED light radiation sources (LI, L2, L3) of different colours, are identified by calculating successive points on the perimeter (E) of the gamut area, with said successive points having, in an HSV system (HSV_C), angular coordinate values representative of respective hue values. The method includes: selecting an increment step value for said angular coordinate, and calculating, from a starting colour point, a next colour point on the perimeter (E) of the gamut area, as a function of the increment step value (δ) selected for the angular coordinate, - calculating a metric (e.g. SDCM) indicative of the distance between the starting colour point and the next colour point, - applying to the calculated metric an acceptance test with at least one acceptance threshold, and i) if the calculated metric passes the acceptance test, calculating a further next colour point by using said next colour point as a new starting colour point, and ii) if the calculated metric fails the acceptance test, selecting an updated value for said angle increment step, and re-calculating the next colour point from the starting colour point by using the updated value.