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By Feng Wu

Visible info is among the richest and so much bandwidth-consuming modes of conversation. to satisfy the necessities of rising functions, strong information compression and transmission thoughts are required to accomplish hugely effective conversation, even within the presence of starting to be conversation channels that supply elevated bandwidth.Presenting the result of the author's years of study on visible data Read more...

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To encode DCT coefficients related to different resolutions, differently optimized variable length codes are provided in the spatial scalable mode. MPEG-2 also defines a method of temporal scalability, which allows prediction of additional inserted pictures either from the base layer sequence or from an enhancement layer sequence. 4 MPEG-4 MPEG-4 is an innovative video standard. It tries to make a breakthrough on the hybrid video coding framework by considering video contents. The most famous concept introduced by MPEG-4 is object-based coding, although it has never been adopted by the industry.

2) si ∈A s j ∈A The conditional entropy of Si given S j is defined as the expected value of the entropies of the conditional distributions. 5) s j ∈A si ∈A = −E p(si ,s j ) log p(Si | S j ). 6) As we have discussed, entropy is a measure of the uncertainty of a random variable. It is also a measure of the amount of information required on average to describe the random variable. However, mutual information is a measure of the amount of information that one random variable contains about another random variable.

Its video compression ratio is about 26:1. MPEG-1 was the first video standard to be widely adopted by the industry. It provides video and audio compression for CD. 261, MPEG-1 first introduces bidirectionally predictive coding. It is known as B picture coding, where two reconstructed pictures are used for motion compensation. One is the most recently reconstructed picture and another is the closest future reconstructed picture. By using both past and future pictures for prediction, MPEG-1 can get better coding performance.

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