Ericsson Ab

Philip Graham White

Matthew Compton

Kismat Singh

A method of obtaining a quantization value for macroblocks of a picture for video compression includes estimating, for a plurality of quantization values, a size of the picture in terms of a sum of all quantized coded coefficients. A linear relationship between a size of a macroblock and Activity of the macroblocks is assumed, where the Activity of the macroblock is the number of coded coefficients in the macroblock before discarding any coefficients or quantizing the remaining coefficients. The macroblocks are dividedinto groups by their Activity level such that substantially a same number of pre-quantization coefficients are in each group. An average Activity of each group is determined. A quantization value for each group is determinedfrom the assumed linear relationship between a number of bits per macroblock and Activity of the macroblocks and the average Activity of the group, as imposed by a predetermined bit rate.

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Eastleigh, United Kingdom

Philip Graham White