Patent ID: 7668380
Filing Date: 2010-02-23
Classification: H04N

Abstract:
1. A method of rate control for one or more images transformed to obtain transform coefficients, which are partitioned into coding units that are each coded in a plurality of quality increments having respective significance values, comprising: defining subsets as collections of coding units including a first subset and a second subset that include different collections of coding units, at least one of said first or second subsets including two or more coding units and at least one image contributing one or more coding units to each of said first and second subsets; setting a list of requirements (LOR) for the subsets, said LOR including a first size requirement for said first subset and a second size requirements for said second subset, said first and second size requirements being different; using the significance values to select with a rate controller quality increments to satisfy the first size requirement for the first subset and the second size requirement for the second subset; and constructing an admissible codestream for said one or more images from the selected quality increments.