Patent ID: 8559501
Filing Date: 2013-10-15
Classification: H04N

Abstract:
1. A method for adaptively determining a bit budget for encoding of video pictures, comprising the steps of selecting a group of at least three adjacent pictures and a bit budget for the selected group of pictures; pre-analyzing each of the pictures, wherein respective predicted residuals in the frequency domain are generated; based on the result of the pre-analysis, allocating bits to the pictures; and encoding each of the pictures with the allocated number of bits, wherein the step of pre-analyzing comprises the steps of extracting attention area information on block or macroblock level for each of the pictures that shall use Intra refresh, wherein Intra refresh means forced intra coding of specified picture portions; based on said extracted attention area information, generating for each selected picture an Intra refresh map indicating for blocks or macroblocks whether they will be Inter or Intra coded; generating for each picture a predicted residual according to the Intra refresh map; transforming the residuals into the frequency domain; calculating for each of the pictures a complexity index in the frequency domain; calculating a complexity proportion of each picture based on the complexity indices; and allocating to each picture an amount of bits according to its complexity proportion and the bit budget of the group of pictures.