30 August 2006 Sensing. Refresher on Complex Numbers djoyce/complex/ .
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Transcript of 30 August 2006 Sensing. Refresher on Complex Numbers djoyce/complex/ .
Refresher on Complex Numbers
• http://www.clarku.edu/~djoyce/complex/
• http://www.dspguide.com/ch30.htm
Digital World
• Quantized in:– time– space– color– brightness
how many frames/second?
how many pixels?
how many primaries?
how many bits/pixel?
Outline
• Image formation– Pinhole camera– Point source (x-ray)– Lens
• Sensors– Film– Image orthicon– CCD
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?