The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 29, 2012
Filed:
Dec. 20, 2007
Kismat Singh, Bitterne, GB;
Philip Graham White, Eastleigh, GB;
Matthew Patrick Compton, Winchester, GB;
Kismat Singh, Bitterne, GB;
Philip Graham White, Eastleigh, GB;
Matthew Patrick Compton, Winchester, GB;
Ericsson AB, Stockholm, SE;
Abstract
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.