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The problem of efficient bit allocation for dependent video coding within the context of ascribing a quantizer to each macroblock (MB) within a frame is addressed in this letter. Strongly dependent MBs exhibit significant discontinuities on their operational distortion-rate (D-R) convex hulls that nullify the assumptions made for the use of the coordinate-wise steepest-descent (SD) algorithm. A qualified slope concept and a near-neighborhood look-ahead modification are introduced to circumvent these problems and are experimentally evaluated on a set of H.263+ encodings.
Circuits and Systems for Video Technology, IEEE Transactions on (Volume:19 , Issue: 7 )
Date of Publication: July 2009