Patent ID: 9049446
Filing Date: 2015-06-02
Classification: H04N

Abstract:
1. A method of adapting a Quantization parameter of digitally encoded video, comprising: using a look-ahead encoding pass to provide look-ahead bit costs for each macroblock in a picture of interest; calculating an activity metric for each macroblock in the picture of interest; determining at least an accumulated look-ahead bit cost threshold for a low macroblock activity category, wherein the low macroblock activity category comprises macroblocks having an activity metric below a pre-determined level; sorting the macroblocks according to the calculated activity metrics of each macroblock to provide sorted macroblocks; adding sorted macroblocks to the low macroblock activity category in ascending activity order and accumulating bit costs of the added sorted macroblocks up to the determined accumulated look-ahead bit cost threshold; applying a change in quantization parameter, Qp, to the macroblocks of the picture of interest comprising decreasing the Qp value of the macroblocks in the low macroblock activity category; and wherein the determined accumulated look-ahead bit cost threshold is determined by providing an accumulated look-ahead bit cost threshold based upon: