Patent ID: 8077775
Filing Date: 2011-12-13
Classification: H04N

Abstract:
1. A rate controller which adaptively adjusts a quantization parameter (QP) to control a bit rate of a video encoder, said rate controller comprising: a first circuit which calculates an estimated QP based on encoding bit rate information of a current frame and first complexity information of a previous frame; a second circuit which calculates a threshold value based on a video quality factor, a target bit rate and second complexity information of a previous interval of said current frame or of said previous frame; a comparator which asserts an adjust signal if said estimated QP is greater than said threshold value; a third circuit which calculates an adaptive QP when said adjust signal is asserted, wherein said adaptive QP is based on said estimated QP and said threshold value; and select logic which provides said adaptive QP as a next QP when said adjust signal is asserted and which otherwise provides said estimated QP as said next QP.