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Modified Steepest-Descent for Bit Allocation in Strongly Dependent Video Coding

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2 Author(s)
Keith L. Ferguson ; Council of Sci. & Ind. Res. (CSIR), Meraka Inst., Pretoria, South Africa ; Nigel M. Allinson

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.

Published in:

IEEE Transactions on Circuits and Systems for Video Technology  (Volume:19 ,  Issue: 7 )