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

Flashcards

Multimedia Compression Purpose

Reducing the bits needed to represent multimedia data.

Lossless Compression

Preserves all original data during compression and decompression.

Compression Ratio (B0)

Calculated as B0 divided by B1.

Entropy (Information Theory)

Minimum bits needed to encode a media source.

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Self-Information (event A)

-logâ‚‚P(A)

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Information from symbol 0

logâ‚‚(1/0.25)

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Entropy (η)

Amount of information per symbol in a source.

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Self-Information

Amount of information in a single symbol.

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Run-Length Coding (RLC)

Uses data redundancy to compress data.

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Variable-Length Coding (VLC)

Uses different code lengths for different symbols.

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Shannon-Fano Algorithm

Top-down approach to sort symbols in VLC.

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Entropy (source)

Average amount of information per symbol.

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Memoryless Source

Symbols are independent from each other.

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Variable-length codes

Codes with variable length.

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Run Length Coding

Compression technique using repeating patterns.

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