Flicker compensation for cameras

Abstract

In a method of compensating an image signal ( ) having a field frequency of substantially N times a mains frequency, in which N≧2, for AC light source induced fluctuations, the image signal ( ) and an average signal representing an average image signal content over a given time period are arithmetically processed ( ) to obtain a corrected signal ( ), in which at least N−1 differences between at least N−1 respective phases of the corrected signal ( ) on the one hand, and a selected phase (ph ) other than the N−1 phases of the corrected signal ( ), or an average over N fields of the image signal ( ), on the other hand, are integrated ( ), and in which at least N−1 integrated differences are processed ( ) to obtain a correction factor for the image signal ( ).