30 August 2006 Sensing. Refresher on Complex Numbers

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Presentation transcript:

30 August 2006 Sensing

Refresher on Complex Numbers

World is practically continuous in time space color brightness 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

Charge Coupled Device From: