MULTIMEDIA AND QUALITY OF SERVICE
COMPRESSION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Is a lossless compression format
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Creates a dictionary of common letter combinations to encode words with fewer characters
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Creates a dictionary of smaller letters so less space is used
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Sends the dictionary with the data
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Doesn’t need to send the dictionary with the data
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Detailed explanation-1: -In dictionary compression, variable length substrings are replaced by short, possibly even fixed length codewords. Compression is achieved by replacing long strings with shorter codewords. The general scheme is as follows: The dictionary D is a collection of strings, often called phrases.
Detailed explanation-2: -Dictionary-based coding techniques replace input strings with a code to an entry in a dictionary. The most well known dictionary-based techniques are Lempel-Ziv Algorithms (Ziv and Lempel, 1977, 1978) and their variants (Storer and Szymanski, 1982; Welch, 1984).
Detailed explanation-3: -Dictionary encoding is a data compression technique that can be applied to individual columns of the following effective types: int. long. date. char1-char256.