Image Compression and Encoding
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Questions and Answers

What is the maximum compression ratio achieved by run-length encoding in the best case?

  • 128:1
  • 64:1 (correct)
  • 256:1
  • 32:1

    • What is the result of run-length encoding in the worst case scenario?

  • A compression ratio of 2:1
  • An expansion of 256:1
  • An expansion of 127:128 (correct)
  • A compression ratio of 1:1

    • What type of image data is CCITT encoding suitable for?

  • Grayscale images
  • Monochrome 1-bit per pixel image data (correct)
  • Colour images
  • General data

    • What organization defined the CCITT encoding standard?

    <p>International Telecommunications Union (ITU)</p> Signup and view all the answers

    How does CCITT encoding handle encoded or decoded data that does not end at a byte boundary?

    <p>By inserting unused bits at the end of each scan line</p> Signup and view all the answers

    Where can the detailed description of the CCITT encoding algorithm be found?

    <p>ITU Recommendations T.4 and T.6</p> Signup and view all the answers

    What is the primary technique used in JPEG encoding?

    <p>Discrete Cosine Transform</p> Signup and view all the answers

    What is the benefit of using DCT in JPEG encoding?

    <p>It is designed specifically for compression of sampled continuous-tone images</p> Signup and view all the answers

    How many colour components can each image sample consist of when using JPEG encoding?

    <p>One, two, three, or four</p> Signup and view all the answers

    How are the colour component values stored in JPEG encoding?

    <p>Each component value occupies a byte</p> Signup and view all the answers

    What is the role of the encoder in JPEG encoding?

    <p>To control the algorithm and the information loss</p> Signup and view all the answers

    Where can the parameter values for DCTDecode be obtained from?

    <p>Either from the encoded data or the filter parameter dictionary</p> Signup and view all the answers

    What is the primary purpose of the EncodedByteAlign parameter in CCITTFaxDecode?

    <p>To ensure byte alignment of each encoded scan line</p> Signup and view all the answers

    What happens when a filter reaches EOD during decoding?

    <p>It skips to the next byte boundary following the encoded data</p> Signup and view all the answers

    What is the primary factor affecting the compression ratio of CCITT encoding?

    <p>The length of the scan line</p> Signup and view all the answers

    What is the minimum compression ratio achievable with CCITT encoding?

    <p>75:1</p> Signup and view all the answers

    What is the purpose of the optional parameters in the CCITTFaxDecode filter?

    <p>To customize the decoding process for specific data</p> Signup and view all the answers

    What is the primary advantage of using the CCITTFaxDecode filter?

    <p>It is compatible with the PDF convention for sampled image data</p> Signup and view all the answers

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