30 august 2006
DESCRIPTION
30 August 2006. Sensing. Refresher on Complex Numbers. http://www.clarku.edu/~djoyce/complex/ http://www.dspguide.com/ch30.htm. World is practically continuous in time space color brightness. 10 11 dynamic range brightness. Digital World. Quantized in: time space color brightness. - PowerPoint PPT PresentationTRANSCRIPT
30 August 2006
Sensing
Refresher on Complex Numbers
• http://www.clarku.edu/~djoyce/complex/
• http://www.dspguide.com/ch30.htm
World is practically continuous intimespacecolorbrightness
1011 dynamic range brightness
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
Pinhole Camera
Features?
Tradeoffs?
Lens
Features?
Tradeoffs?
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?
Cathode Ray Tube
Vidicon (tv camera)
X-Ray
X-Ray
Charge Coupled Device
From: http://www.science.ca/scientists/scientistprofile.php?pID=129