Multimedia Data Compression Lecture 4 Quiz
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Questions and Answers

What is the purpose of compression in multimedia technology?

  • To increase the storage space required for multimedia data
  • To increase the bandwidth required for multimedia data
  • To reduce the total number of bits needed to represent multimedia information (correct)
  • To slow down the transmission of multimedia data

    • In the context of compression, what does a lossless compression scheme mean?

  • It reduces the resolution of multimedia files
  • It increases the entropy of the multimedia source
  • It only works with raw media files
  • It induces no information loss during the compression and decompression processes (correct)

    • How is the compression ratio (B0 compression ratio) calculated?

  • (B0 - B1) / B0
  • B0 / B1 (correct)
  • (B1 - B0) / B1
  • (B1 + B0) / 2

    • What does 'Entropy' represent in the context of information theory?

    <p>The minimum number of bits needed to encode a media source (B)</p> Signup and view all the answers

    What is the self information of an event A defined as?

    <p>-logbP(A) (B)</p> Signup and view all the answers

    In the example provided, if a source outputs two symbols 0 or 1, with P(0) = 0.25 and P(1) = 0.75, what is the information we get when receiving a 0?

    <p>$\log_2 (1/0.25)$ (D)</p> Signup and view all the answers

    What does the entropy η of an information source with alphabet S = {s1, s2,. , sn} indicate?

    <p>The amount of information contained in each symbol (B)</p> Signup and view all the answers

    In the context of information theory, what does the term 'self information' refer to?

    <p>The amount of information contained in a single symbol (B)</p> Signup and view all the answers

    What is the purpose of Run-Length Coding (RLC) in information theory?

    <p>To exploit memory present in the information source (C)</p> Signup and view all the answers

    What is the main principle behind Variable-Length Coding (VLC) in information theory?

    <p>Encoding symbols using fixed-length codes (A)</p> Signup and view all the answers

    In the context of information theory, what does 'Shannon-Fano Algorithm' aim to achieve?

    <p>Using a top-down approach to sort symbols (D)</p> Signup and view all the answers

    What does the entropy of an information source indicate?

    <p>The amount of information contained in each symbol (D)</p> Signup and view all the answers

    What is meant by 'memoryless source' in the context of information theory?

    <p>An information source that independently distributes symbols (C)</p> Signup and view all the answers

    'Self information' represents which aspect of a symbol in information theory?

    <p>The amount of information contained in a single symbol (D)</p> Signup and view all the answers

    'Variable-Length Coding' in information theory refers to what type of encoding?

    <p>Encoding symbols using variable-length codes (C)</p> Signup and view all the answers

    What does 'Run-Length Coding (RLC)' exploit in an information source?

    <p>Memory present in the information source (C)</p> Signup and view all the answers

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