| Summary: | 碩士 === 國立嘉義大學 === 資訊工程學系研究所 === 97 === The paper proposes a new rate-estimation metric instead of the mean of absolute
difference (MAD) in the H.264/AVC to improve the bandwidth utilization. It is called
DCT-spectral bit-amount abundance (DBA) that to compute DBA costs no heavy
burden in the rate controlling. The DBA of macroblock (MB) can not only have a good
mapping of coding bit count and, particularly, but also be well-predicted from a
predictive MB found in the decoded reference frame. The QP decision by the
rate-quantization-complexity R-Q-C equation constructed by DBA is quite effective.
For complying with a one-pass type of video-coding, the rate controller uses the
predicted value of DBA from the stored frame rather than the actual one under
one-pass constraint in rate-controlling. So, we also address an efficient matching
method using a circle-contrast mean vector (CCMV) to find the highest-correlation
predictive MB of coding MB (CMB) for proper DBA estimation. Experiment results
show that the proposed rate controlling applying DBA searched by DCMV to
H.264/AVC can quite outperform the rate controlling suggested by JM15.1 in terms of
PSNR and buffer fullness stabilization with negligible extra computational load.
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