Back to results
US 7,605,872 B2Granted
Video contrast adjusting method and system
AssigneeMediatek Inc.
InventorHong-Hui Chen
Life of this patent
Estimating the term…
Abstract
Methods and systems for adjusting color-saturation contrast of the video signal. Statistical information based on chrominance or luminance measures is analyzed to derive a gain function. The gain function is also determined according to the detection result of an exceptional situation during statistical analysis. The gain function is applied to the video signal to modify the amplitude of the chrominance signal.
Claims28
A method for adjusting the contrast of a video signal, comprising:
- conducting statistical computation to retrieve statistical information of an amplitude of a chrominance signal;
- detecting an occurrence of an exceptional situation according to the statistical information;
- deriving a gain function based on the statistical information and the detection result of the exceptional situation;
- and
- applying the gain function to the video signal to modify the amplitude of the chrominance signal;
- wherein the statistical information is a distribution analysis of the amplitude of the chrominance signal;
- and
- conducting the statistical computation further comprises dividing possible values of the amplitude of the chrominance signal into groups, and counting a number of pixels belonging to each group.
5 more elements
A system for adjusting the contrast of a video signal, comprising:
- a memory, collecting and storing statistical information of an amplitude of a chrominance signal;
- a computing unit, conducting statistical computation by accessing statistical information from the memory, and detecting an occurrence of an exceptional situation according to the statistical information;
- a gain function generator, deriving a gain function based on the statistical information and possibly the exceptional situation calculated and detected by the computing unit;
- and
- a gain stage, applying the gain function derived by the gain function generator to the video signal to generate an enhanced video signal by modifying the amplitude of the chrominance signal;
- wherein the statistical information retrieved by the computing unit is a distribution analysis of the amplitude of the chrominance signal;
- and the computing unit divides possible values of the amplitude of the chrominance signal into groups, and counts a number of pixels belonging to each group.
4 more elements
Dependencies are inferred from the claim text.