Patent ID: 6671001
Filing Date: 2003-12-30
Classification: H04N

Abstract:
An offset level detection method for auto color gain control of analog video signals for finding an optimal offset level to determine inputs for the auto color gain control, which comprises the steps of:defining an offsetmax of the analog video signals and determining a first offset level and search parameters; detecting and extracting the analog video signals; increasing the first offset level when the offset level of the video signals is higher than the first offset level; decreasing the first offset level when the offset level of the video signals is lower than the first offset level; updating the first offset level until the search is complete; setting the first offset level as a first min; determining a second offset level and search parameters according to the first min; detecting and extracting the analog video signals; determining whether the offset level of the video signals is higher than the second offset level; increasing the second offset level when the offset level of the video signals is higher than the second offset level; updating the second offset level until the search is complete; setting the second offset level as a second min; and averaging the first min and the second min to obtain the optimal offset level.