By Feng Wu
Visible details is among the richest and such a lot bandwidth-consuming modes of communique. to fulfill the necessities of rising functions, strong information compression and transmission suggestions are required to accomplish hugely effective conversation, even within the presence of transforming into conversation channels that supply elevated bandwidth.Presenting the result of the author's years of study on visible data compression and transmission, Advances in visible information Compression and verbal exchange: assembly the necessities of recent functions presents a theoretical. Read more...
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Extra resources for Advances in Visual Data Compression and Communication: Meeting the Requirements of New Applications
It is a 2D MV, whose direction indicates the moving direction and magnitude is the moving distance. 2 An example of motion estimation and compensation. the corresponding blocks in the reconstructed picture toward the input picture. We can observe that the prediction is much more similar to the input picture than the reconstructed picture. For the first picture, there is no reconstructed picture available and thus it is compressed directly without motion compensation. This picture is called an intra picture.
This is the basis of variable length coding (VLC). How to design the set of codewords and how to assign them to the symbols are just the problems to be solved in source coding. The optimization of source coding aims to make the excepted coding length L(S) equal to the entropy H(S). There are several source coding methods that are optimal and can reach information entropy. We will discuss Huffman coding and arithmetic coding in the following sections. 1 Huffman Coding An optimal prefix code for a given distribution can be constructed by a simple algorithm proposed by Huffman , widely known as Huffman coding.
We can observe that the prediction is much more similar to the input picture than the reconstructed picture. For the first picture, there is no reconstructed picture available and thus it is compressed directly without motion compensation. This picture is called an intra picture. Correspondingly, the pictures coded by using motion compensation are called inter pictures. As we have discussed, neighboring pixels have similar values. 3a. The spatial redundancies are exploited by transform. Discrete cosine transform (DCT) is widely used in most existing image and video coding standards.
Advances in Visual Data Compression and Communication: Meeting the Requirements of New Applications by Feng Wu