A video signal white level corrector wherein a digital memory is used to store a correction signal which is applied to a signal multiplier to remove white level shading which results from optic and beam misalignment of a scanner. Video signals are applied to a multiplier 10, the output therefrom being...http://www.google.com/patents/US4486781?utm_source=gb-gplus-sharePatent US4486781 - Video signal white level corrector
