好书共享：Compressed video communication

Malatown

Introduction
Since the digital representation of raw video signals requires a high capacity, low
complexity video coding algorithms must be defined to efficiently compress video
sequences for storage and transmission purposes. The proper selection of a video
coding algorithm in multimedia applications is an important factor that normally
depends on the bandwidth availability and the minimum quality required. For
instance, a surveillance application may only require limited quality, raising
alarms on identification of a human body shape, and a user of a video telephone
may be content with only sufficient video quality that enables him to recognise the
facial features of his counterpart speaker. However, a viewer of an entertainment
video might require a DVD-like service quality to be satisfied with the service.
Therefore, the required quality is an application-dependent factor that leads to a
range of options in choosing the appropriate video compression scheme. Moreover,
the bit and frame rates at which the selected video coder must be adaptively
chosen in accordance with the available bandwidth of the communication medium.
On the other hand, recent advances in technology have resulted in a high
increase of the power of digital signal processors and a significant reduction in the
cost of semiconductor devices. These developments have enabled the implementation
of time-critical complex signal processing algorithms. In the area of
audiovisual communications, such algorithms have been employed to compress
video signals at high coding efficiency and maximum perceptual quality. In this
chapter, an overview of the most popular video coding techniques is presented and
some major details of contemporary video coding standards are explained. Emphasis
is placed on the study and performance analysis of ITU-T H.261 and H.263
video coding standards and a comparison is established between the two coders in
terms of their performance and error robustness. The basic principles of the ISO
MPEG-4 standard video coder are also explained. Extensive subjective and
objective test results are depicted and analysed where appropriate.
Ch2:Overview of Digital Video Compression Algorithms
CH3:Flow Control in Compressed Video Communications
Ch4:Error Resilience in Compressed Video Communications
CH5 :Video Communications Over Mobile IP Networks
Ch6:Video Transcoding for Inter-network Communications

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