White balance method for image projection system, measures absolute power of each beam using sensor and sets beam power for each primary color accordingly

摘要

A projector produces a color image on a projection surface, or several projectors produce multiple sub-images to form a single color image on the projection surface. A control and evaluation unit (26) controls absolute power measurements of the radiation of each light beam using a sensor (56), and further calculations and settings are carried out accordingly. An Independent claim is included for an apparatus for white balance.