The variable length code design of a complete quadtree-based video
codec is addressed, in which we jointly optimize the entropy-coding
for the parameters of motion-compensated prediction together with the
residual coding.
The quadtree coding scheme selected for this optimization allows easy
access to the rate-distortion costs, thus making it possible to
perform rate-distortion optimized bit allocation without exhaustive
computation.
Throughout the paper, we view the quadtree coder as a special case of
tree-structured entropy-constrained vector quantization and derive a
design algorithm which iteratively descents to a (locally) optimal
quadtree video codec.
Experimental results evaluate the performance of the proposed design
algorithm.
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