| Multimedia Compression |
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Multimedia compression is a general term referring to the Compression of data for any type of Multimedia , most notably graphics, Audio , and Video . EXPLANATION Because multimedia typically derives from data sampled by a device such as a Camera or a Microphone , and because such data contains large amounts of random noise, traditional lossless compression algorithms tend to do a poor job compressing multimedia. Multimedia compression algorithms, traditionally known as Codecs , work in a Lossy fashion: #Transform the data according to a model designed to reduce sample-to-sample correlation, concentrating the important signal in a few data values. #Quantize the data, most of which has become noise. Some codecs use a scalar quantizer followed by Run-length Encoding ; others use Vector Quantization . #Use Entropy Coding such as Huffman Coding to reduce the number of bits that the most common values use. This method is called Transform Coding . Multimedia compression has become the primary focus of compression research, primarily in a search for more efficient models. It is the most important part in Video Coding formats. See also: |
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