| Summary: | 碩士 === 國立中央大學 === 通訊工程研究所碩士在職專班 === 98 === The development of networks and video coding techniques promote
the applications of multimedia communication. The objective of the
service of multimedia applications is not only to deliver videos with better
quality but also to maintain the compressed bit stream to meet the
requirements under various network situations. Therefore, the rate control
mechanism plays an important role in a practical encoding system.
The proposed methods can reflect the real status by utilizing the target
buffer level and the target bits allocation. First, on the allocation of target
buffer level, by using the ratio of remaining bits rather than linear decrease
from JM, the proposed method can adjust dynamically to meet the actual
buffer fullness. And then, on the allocation of target bits, by using the
comparison of the actual available bit rate and the expected available bit
rate rather than the average bit rate from JM, the proposed method
allocates more suitable number of bits to reflect the actual bit rate and
buffer fullness.
The experiment results are compared with JM 15.1 reference software.
It shows that the proposed methods fit the target rate more accurately, get
more stable video quality, and reduce the occupancy of the virtual buffer to
avoid buffer overflow or underflow problems.
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