JPEG 2000 Compression: Lecture 8 Overview
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Questions and Answers

What is the main disadvantage of DCT-based JPEG compression?

  • Equal subbands
  • Robust under transmission errors
  • Facilitates progressive transmission
  • Noticeable block boundaries (correct)

    • Why is wavelet-based compression considered an improvement over DCT-based compression?

  • Higher compression ratio
  • Concentrated coefficients at lower frequencies
  • Use of uniform quantization
  • No need to block the image (correct)

    • What type of transformation is used in original JPEG compression?

  • Quantization Transformation
  • Discrete Cosine Transformation (DCT) (correct)
  • Discrete Fourier Transformation (DFT)
  • Discrete Wavelet Transformation (DWT)

    • What does JPEG 2000 offer that makes it more computationally expensive than original JPEG?

    <p>Overlap of blocks</p> Signup and view all the answers

    At low bit rates, which compression method experiences a sharp degradation in image quality?

    <p>DCT-based JPEG</p> Signup and view all the answers

    What feature of wavelet-based compression makes it more robust under transmission errors?

    <p>Concentrated coefficients at lower frequencies</p> Signup and view all the answers

    What is the main deficiency of the current JPEG standard in low bit rate compression performance?

    <p>It becomes unacceptable at low bit rates</p> Signup and view all the answers

    What is a limitation of the current JPEG standard in handling large images?

    <p>It does not allow for images larger than 64Kx64K pixels without quality degradation</p> Signup and view all the answers

    What is a drawback of the current JPEG standard in handling transmission in noisy environments?

    <p>It degrades badly when bit errors occur</p> Signup and view all the answers

    Why is the current JPEG standard not applied to compound documents?

    <p>It has poor performance when applied to text imagery</p> Signup and view all the answers

    What type of imagery is the current JPEG standard optimized for?

    <p>Natural imagery</p> Signup and view all the answers

    What is a major deficiency of the current JPEG standard in handling lossless and lossy compression?

    <p>It does not provide superior lossless and lossy compression in a single codestream</p> Signup and view all the answers

    What is a key limitation of the current JPEG standard regarding image size?

    <p>It does not allow for images larger than 64Kx64K pixels without quality degradation</p> Signup and view all the answers

    What issue does the current JPEG standard have when applied to computer-generated imagery (Graphics)?

    <p>It is optimized only for natural imagery</p> Signup and view all the answers

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