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Estimating Power Consumption: Olympus E-1 Scott Kirkpatrick Where does the power go? Major components Imager (analog + A2D), compression asic, DSP, memory and memory management, USB LCD for viewing pictures, histogram, etc. Lens controls – autofocus, autoexposure

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where does the power go
Where does the power go?
  • Major components
    • Imager (analog + A2D), compression asic,

DSP, memory and memory management, USB

    • LCD for viewing pictures, histogram, etc.
    • Lens controls – autofocus, autoexposure
    • Shutter and mirror mechanisms
    • Startup stuff – e.g., the dust-buster
  • Controls available to the photographer
    • Manual operation
    • Use of standby power-down
    • The “half-press”
    • Choice of Tif, RAW, JPG and quality level of output
  • Emphasise maximizing the number of pictures

per battery charge

how to measure this
How to measure this
  • Use a computerized external power supply
  • Operate with battery out of camera
    • (does this make it operate differently
      • For example, it won’t go into standby state
  • Fix voltage at 9V, monitor current used on a PC through GPIB card, connection to power supply
taking and saving pictures of various sizes
Taking and saving picturesof various sizes

From left: TIFF, SHQ, HQ, SQ, Raw file

effect of most available controls
Effect of most available controls
  • Matter less than the basic cost of operation
  • Battery is 1.5 A-hr (4X what a cellphone has). This covers 7.5 hr of operation with no pictures taken. Basic cost of operation is 0.2 A.
  • Taking a picture, focusing the lens, momentarily increases workload to .25 or .3 A. Still 5 to 7.5 hrs of operation.
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