Patent ID: 8189677

Claim:
A method of Rate-QP estimation for a P picture, comprising: (a) inputting an input group of pictures (GOP) to a computer; (b) selecting, on the computer, an input P picture within the input group of pictures; and (c) outputting, from the computer to a computer readable medium, a bit rate corrected Rate-QP, R(QP), for the input P picture; (d) wherein the outputting step comprises: (i) calculating an intra luma (Y) Rate-QP estimate from an intra luma (Y) histogram; (ii) calculating an intra chroma (C) Rate-QP estimate from an intra chroma (C) histogram; (iii) offsetting the intra chroma (C) Rate-QP estimate to form an offset intra chroma (C) estimate; (iv) calculating a non-intra luma (Y) Rate-QP estimate from a non-intra luma (Y) histogram; (v) calculating a non-intra chroma (C) Rate-QP estimate from a non-intra chroma (C) histogram; (vi) offsetting the non-intra chroma (C) Rate-QP estimate to form an offset non-intra chroma (C) estimate; and (vii) setting a Rate-QP for the input P picture to a sum of: (a) the intra luma (Y) Rate-QP estimate; (b) the offset intra chroma (C) Rate-QP estimate; (c) the non-intra luma (Y) Rate-QP estimate; and (d) the offset non-intra chroma (C) Rate-QP estimate.