Patent ID: 8199823

Claim:
A method of Rate-QP estimation for a B picture, comprising: (a) providing an input group of pictures (GOP); (b) selecting an input B picture within the input group of pictures; and (c) outputting, to a computer readable medium, a bit rate corrected Rate-QP, R(QP) , for the input B picture, comprising: (d) calculating an intra luma (Y) Rate-QP estimate from an intra luma (Y) histogram; (e) calculating an intra chroma (C) Rate-QP estimate from an intra chroma (C) histogram; (f) offsetting the intra chroma (C) Rate-QP estimate to form an offset intra chroma (C) estimate; (g) calculating a non-intra luma (Y) Rate-QP estimate from a non-intra luma (Y) histogram; (h) calculating a non-intra chroma (C) Rate-QP estimate from a non-intra chroma (C) histogram; (i) offsetting the non-intra chroma (C) Rate-QP estimate to form an offset non-intra chroma (C) estimate; and (j) setting a Rate-QP for the input B picture to a sum of: (i) the intra luma (Y) Rate-QP estimate; (ii) the offset intra chroma (C) Rate-QP estimate; (iii) the non-intra luma (Y) Rate-QP estimate; and (iv) the offset non-intra chroma (C) Rate-QP estimate.