Modified steepest-descent for bit allocation in strongly dependent video coding

Authors:
Keith L. Ferguson;Nigel M. Allinson
Affiliations:
Council of Scientific and Industrial Research, Meraka Institute, Pretoria, South Africa;University of Sheffield, Sheffield, UK
Venue:
IEEE Transactions on Circuits and Systems for Video Technology
Year:
2009

Citing 3
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Abstract

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.