Digital Cameras CPSC 453 Fall 2018 Sonny Chan The Digital - - PowerPoint PPT Presentation

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Digital Cameras CPSC 453 Fall 2018 Sonny Chan The Digital - - PowerPoint PPT Presentation

Sep 05, 2022 412 likes •586 views

Digital Cameras CPSC 453 Fall 2018 Sonny Chan The Digital Revolution ca. 1990s Is it always better to have more megapixels? W. Boyle & G. Smith AT&T Bell Labs, 1969 Charge-Coupled Devices Photons converted to electrical

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SLIDE 1

Digital Cameras

CPSC 453 – Fall 2018 Sonny Chan

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SLIDE 2

The Digital Revolution

  • ca. 1990s
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SLIDE 3

Is it always better to have

more megapixels?

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SLIDE 4
  • W. Boyle & G. Smith

AT&T Bell Labs, 1969

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SLIDE 5

Charge-Coupled Devices

  • Photons converted to

electrical charge

  • Stored in capacitor array
  • More photons = greater

charge

  • Charges read from array

to produce an image

  • 2009 Nobel Prize in

Physics

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SLIDE 6

Active Pixel Sensors

  • CMOS sensors
  • Each pixel has its own

active amplifier

  • Ability for continuous read
  • Cheaper than CCD
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SLIDE 7

What about

colour?

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SLIDE 8

Colour Images: Bayer Mosaic

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SLIDE 9
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SLIDE 10

Which one takes a better picture?

Nikon D100 6.1 megapixels iPhone 8 12 megapixels

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SLIDE 11

Digital Camera Image Sensors

[from rickclinephotography.com]

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SLIDE 12

Remember the

modern camera’s goal?

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SLIDE 13

Smart Phone Lenses

Do these things actually work???

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SLIDE 14

Why two cameras?

Apple iPhone 8 and iPhone X

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SLIDE 15

Lytro Illum - where did all the dials and buttons go?

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Things to Remember

  • CCD/CMOS sensors allow us to capture digital images
  • a Bayer Mosiac of coloured filters lets us take colour pictures
  • More megapixels isn’t always better
  • we want to get as much light onto each pixels as possible