Bitstream Processing and Analysis for Video Communication Systems
Date Issued
2005
Date
2005
Author(s)
Chang, Yung-Chi
DOI
en-US
Abstract
In this dissertation, the algorithm analysis, architecture design and applications
for bitstream processing for video communication systems are presented.
Bitstream plays an important role in digital multimedia era since
all video content are represented in bitstream and a lot of important and useful information is hidden in it.
First, we proposed an efficient video streaming system with the help of the coded bitstream.
A new transmission model is proposed for the realization of a content-aware video streaming.
We separate enhancement from encoding.
The streaming
server can adaptively decide quality-enhanced region by selective
enhancement according to both object information from the encoding
side and user-defined region from the receiver side. Besides,
the motion information in the content itself can also be used
as reference. The proposed system
provides better quality in users' interest regions with no
bit-rate or complexity overhead.
In addition, we design an MPEG-4 FGS encoder for this streaming system.
The computational complexity of FGS coding is analyzed to explore an efficient FGS encoder
implementation.
We reorder current MPEG-4 FGS coding flow such that the
picture-level maximum can be acquired in advance and bit-plane
data can be dynamically adapted.
It is completely compatible with MPEG-4.
With several proposed
hardware-oriented optimization approaches, a hardwired FGS
block-level processing core is proposed.
Next, we present the bitstream parsing analysis and an efficient
and flexible bitstream parsing processor design.
The critical part in bitstream parsing is explored.
We proposed novel approaches to parse the data partitioned bitstreams.
An efficient instruction set optimized for bitstream processing, especially for DCT
coefficient decoding, is designed.
In our implementation, it is integrated into an MPEG-4 video decoding
system successfully and achieves real time bitstream decoding under the specification of MPEG-4 Advanced Simple
Profile Level 5.
Both flexibility and computation power are provided at the same time.
Moreover, we perform statistical analysis to model the
error propagation in MPEG-4 bitstream with data partitioning.
With the help of the symbols in the bitstream and its structure,
we explore the error propagation effect under various error detection conditions.
It is shown that errors detected in forward section of texture data may be propagated from motion data,
while those in DCT coefficients mostly result from themselves.
Furthermore, the motion marker
is the major error source for several error conditions detected in motion part. According to these
characteristics, we propose motion marker assumption and backtracking-based strategies.
The experimental results show that more accurate error localization in bitstream domain is achieved.
Subjects
位元流
視訊串流
視訊通訊
bitstream
video streaming
video communication
Type
thesis
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