Game Development Reference
In-Depth Information
would be inescapable. In the industry, HDMI (High-DefinitionMultimedia Interface)
has defined 30, 36, and up to 48-bit color for more vivid color display.
2.3 Video Coding Tools
As referred in Sect.
2.2.1
, after digitalization, the data size of digital video increases
significantly. However, there are a lot of redundancies in the digitalized video sig-
nal. In detail, there exists great correlation among the spatial neighboring pixels and
the temporal successive frames. These redundancies can be categorized into spa-
tial redundancy, temporal redundancy, statistical redundancy, and set redundancy.
In brief, spatial redundancy means correlation among the neighboring pixels in the
picture. And temporal redundancy denotes the correlation between successive pic-
tures. For statistical redundancy, it denotes not only the statistical distribution of
the sampled pixels but also the entropy code to represent the video signal. The set
redundancy means common information found in more than one image or videos
in the set of similar images and videos. The substance of video coding is to reduce
these redundancies existing in the video signal, and according to the characteristics
of redundancy, many coding tools have been developed for video coding and can be
categorized into prediction coding, transform coding, entropy coding, in-loop filter,
etc. Figure
2.9
illustrates the overall timeline for the image and video compression
techniques. This section will give a brief overview of the following subsections.
2.3.1 Prediction Coding
The basic idea of prediction coding is to transmit a differential signal between the
original signal and a prediction for the original signal, instead of the original signal.
Fig. 2.9
Development of coding tools
