Patent ID: 6188788
Filing Date: 2001-02-13
Classification: A61K,H04N

Abstract:
A method for controlling the color level in the color output of a video decoder, comprising the steps of:deriving the color difference signals U and V in a YUV color format for a composite video signal;providing an ideal burst amplitude of the composite video color signal;measuring the actual burst amplitude of the composite video color signal;determining as a scale factor the ratio of the measured burst amplitude to the ideal burst amplitude of the composite video color signal with a recursive relationship requiring only addition and subtraction;determining a first and a second nominal correction factor for the U and V color difference signals, respectively, that represent a correction factor therefor,scaling the first and second nominal correction factors with the determined scale factor with a recursive relationship that represents the respective first and second nominal correction factors divided by the determined scale factor, which recursive relationship utilizes only addition and subtraction to provide on the output thereof respective scaled first and second correction factors, andscaling the color difference signals with the respective first and second scaled correction factors to provide scaled color difference signals U and V.