JPEG Image Compression: DCT Transform
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Questions and Answers

What is the primary reason for the effectiveness of the DCT transform coding method in JPEG?

  • The ability of humans to notice high spatial frequency components
  • The visual acuity in distinguishing closely spaced lines
  • The high accuracy in distinguishing gray and chroma
  • The spatial redundancy in images due to slowly changing content (correct)
  • What is the result of reducing high spatial frequency contents in an image?

  • Increased accuracy in distinguishing closely spaced lines
  • Improved visual acuity in distinguishing gray and chroma
  • Reduced spatial redundancy (correct)
  • Increased spatial redundancy
  • What is the purpose of chroma subsampling in JPEG?

  • To improve the visual acuity in distinguishing gray and chroma
  • To reduce the amount of data required to store an image (correct)
  • To reduce the spatial redundancy in an image
  • To increase the accuracy in distinguishing closely spaced lines
  • What do psychophysical experiments suggest about human perception of image quality?

    <p>Humans are less likely to notice the loss of high spatial frequency components</p> Signup and view all the answers

    What is the typical block size used in the DCT transform coding method in JPEG?

    <p>8 × 8</p> Signup and view all the answers

    What is the primary reason for the spatial redundancy in images?

    <p>Much of the information in an image is repeated.</p> Signup and view all the answers

    Which of the following statements is a direct consequence of Observation 1?

    <p>Much of the information in an image is repeated.</p> Signup and view all the answers

    What is the main purpose of reducing high spatial frequency components in an image?

    <p>To reduce the spatial redundancy in the image.</p> Signup and view all the answers

    Which of the following is a direct application of Observation 2?

    <p>Reducing high spatial frequency components in an image.</p> Signup and view all the answers

    What is the main reason for using chroma subsampling in JPEG?

    <p>To take advantage of human visual system's limited acuity for color.</p> Signup and view all the answers

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