Inside the Digital Camera

1
Inside the Digital Camera
2
Digital Camera Cross Section

• The digital camera is a complex device
• The only part that is the same as film cameras is
  the lens.

3
Taking a Picture Step 1

• Camera is aimed at the scene
• Light reflected from the image passes through the
  lens of the camera.
• The lenses in digital cameras are different form
  those used in film cameras

4
Camera Lens Construction

• The quality of a lens is determined by the
  manufacture and the construction.
• Lens construction consists of elements,
  individual lenses placed in groups.
• The lens at the right has 16 elements in 5 groups

5
Digital Camera Cross Section
6
Taking a Picture Step 2

• The image is focused on a device that is
  sensitive to light.
• The majority of cameras us Charged Coupling
  Devices (CCD)
• Some cameras use CMOS devices.

7
CCD Sensors
8
Bayer Array

• To capture color images, each sensor on a CCD has
  to have a filter placed over it which only allows
  penetration of a particular color of light. 
• Virtually all current digital cameras can only
  capture one of the three primary colors in each
  sensor so they discard roughly 2/3 of the
  incoming light.
• The most common type of filter arrangement is the
  Bayer Array, based on how the human eye sees
  light.

9
Taking a Picture Step 3

• CCD generates an analog signal that represents
  the image

10
Taking a Picture Step 4

• The Analog to Digital Convertor changes the
  analog electrical signal into digital
  information.

ADC
11
Taking a Picture Step 5

• The Digital Signal processor converts the
  information into the file output information.

ADC
DSP
12
Taking a Picture Step 6

• The file information is sent to the flash storage
  media in the camera.

ADC
DSP