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Low lux colour CMOS cameras?

Discussion in 'Electronic Design' started by Daniel Kelly \(AKA Jack\), May 18, 2004.

  1. Hi again,

    Does anyone know of a miniature color PAL CMOS camera sensative to 1 Lux or
    less?

    I have found very sensitive colour CCD cameras and fairly sensitive B&W CMOS
    cameras but no sensitive CMOS cameras.

    Thanks in advance,
    Jack
     
  2. CMOS cameras (or rather CMOS sensors) have a problem with low light.

    One of the problems is the difference in gain of the pixel amps.
    On low light CMOS cameras display all pixels in a different brightness.
    This is a little compensated for by on chip calibration of the individual
    pixel amps.
    The other factor is exposure time.
    Increasing exposure time may help somewhat.
    Reason of all this is tolerances in the CMOS fabrication process IIRC.
    There are some papers on this on the web.
    JP
     
  3. Graham W

    Graham W Guest

    The Philips ToUCam II Pro webcam is specced at 1 Lux but it *doesn't* use
    a CMOS sensor. As others have said, CMOS does not work well at low
    light levels.
     
  4. Ian Stirling

    Ian Stirling Guest

    <snip quoted message incorrectly placed at bottom>
    No.
    Broadly speaking, it'll be three times dimmer in the 3 lux camera.
    You need a camera several times more sensitive in order to have the
    same sensitivity when you convert it to a colour one by putting dyes
    above the pixels in various colours.
    The 1 lux camera may also be sensitive to infrared, which helps
    sensitivity, and does not have losses through dyes to contend with.
     
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