30 August 2006

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30 August 2006

• Sensing

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Refresher on Complex Numbers

• http//www.clarku.edu/djoyce/complex/
• http//www.dspguide.com/ch30.htm

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(No Transcript)
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World is practically continuous
intimespacecolorbrightness
1011 dynamic range brightness
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Digital World

• Quantized in
• time
• space
• color
• brightness

how many frames/second?
how many pixels?
how many primaries?
how many bits/pixel?
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Outline

• Image formation
• Pinhole camera
• Point source (x-ray)
• Lens
• Sensors
• Film
• Image orthicon
• CCD

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Pinhole Camera
Features? Tradeoffs?
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Lens
Features? Tradeoffs?
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How TV Worked(in the old days)

• What is a cathode? What is a cathode ray? What is
  a cathode ray tube?
• What is a phosphor? What are "phosphorescence"
  and "fluorescence"?
• How does a "cathode ray tube" CRT work?
• How was the TV image acquired?
• What is a "raster" scan?
• What are horizontal and vertical "sync"?
• What is "interlace"? Why do that?
• What determines the "resolution"?
• What is "gamma" and why should it be corrected?
• How did they get color?
• How do decisions made in the 40's affect CG, CV,
  and IP today?

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Cathode Ray Tube
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Vidicon (tv camera)
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X-Ray
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X-Ray
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Charge Coupled Device
From http//www.science.ca/scientists/scientistpr
ofile.php?pID129