Assumptions
R and 1/D are monotonic non-decreasing functions of l and 1/Q
- min Rn + ? Dn
- larger Q, higher distortion, less rate
Variations in Q dominate those in l.
- ?D/?R is faster for ?Q than it is for ??
- more efficient to control rate by changing Q instead of making mask more or less complex
Q is the dominating parameter:
- Q?0 ? R??, D?0, ??
- Q?? ? D??, R?0, ??