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UGC NET CSE | June 2012 | Part 3 | Question: 19

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The quantiser in an image-compression system is a

  1. lossy element which exploits the psychovisual redundancy
  2. lossless element which exploits the psychovisual redundancy
  3. lossy element which exploits the statistical redundancy
  4. lossless element which exploits the statistical redundancy
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Answer : lossy element which exploits the psychovisual redundancy

Quantization, involved in image processing, is a lossy compression technique achieved by compressing a range of values to a single quantum value. When the number of discrete symbols in a given stream is reduced, the stream becomes more compressible. 

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