Estimation of i frame average rate quantization parameter (qp) in a group of pictures (gop)

Abstract

Rate-QP estimation for an I picture is disclosed which involves the steps of: providing an input group of pictures (GOP); selecting an input I picture within the GOP; and outputting, to a computer readable medium, a bit rate corrected Rate-QP, R(QP), for the input I picture. The outputting step may involve calculating intra luma and chroma Rate-QP estimates from corresponding intra luma and chroma histograms; offsetting the intra chroma Rate-QP estimate to form an offset intra chroma estimate; and setting a bit rate corrected Rate-QP for the input I picture to a corrected sum of the previous estimates. The histograms are formed with estimates of intra prediction coefficients, where an intra/non-intra mode is selected that results in a lowest SATD for each macroblock in the GOP. The methods may be implemented into a computer program, possibly resident in an advanced video encoder.

Dependencies are inferred from the claim text.