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US 2010/0150241 A1Published application
Video coding
AssigneeBritish Telecommunications public limited company
InventorsMichael Erling NILSSON, Stephen C. Appleby
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Abstract
A video signal is coded using predictive coding. The degree of quantisation that is applied is varied as a function of measures of predictive power, the idea being that a picture that is useful as a predictor for other pictures is worth coding well. These measures are formed in a pre-analysis of the pictures to obtain, for each macroblock analysed, a measure that depends on its similarity to a region for which it is a potential predictor. Preferably these measures are cumulative.
Claims10
A method of coding a video signal, comprising:
- (a) analysing pictures to obtain, in respect of each region thereof analysed, a measure of predictive power, each measure being dependent on the similarity of the region to another region for which it is to be used as a predictor, and
- (b) coding the signal, using differential coding, with a resolution that varies as a function of the measures of predictive power;
- wherein measure of predictive power is calculated cumulatively in that, when a region is similar to the region for which it is to be used as a potential, the measure depends also upon the measure calculated in respect of the latter.
Dependencies are inferred from the claim text.