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What is CCD effective pixel resolution

Discussion in 'Camcorders, Action Cams & Video Editing Forum' started by snelly, Apr 11, 2003.

  1. snelly

    snelly
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    anyone actually know what this means? I have seen cameras with wildly different prices and different specs.

    Is this spec completely useless?

    DOes it bear any realtionship to the resolution of stills or video?

    Does it mean anything different for a 3ccd camera?

    I'm just curious OK!

    thanks

    Tim
     
  2. GrahamC

    GrahamC
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    A ccd chip has number of actual sensors on it, 'effective' is the number of these sensors that are actually used to take the picture.
     
  3. Origin

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    Many cameras interpolate between the pixels to give a higher resolution than the actual number of pixels on the sensor. In theory, this this could be done again and again to give an enormous resolution end-picture. It was decided that to stop manufacturers quoting outlandish [interpolated] resolutions, they should have to quote the actual (effective) number of pixels being used as the original source.

    With 3 CCDs it gets even more complicated, as one pixel in the finished picture file is the result of interpolation between many different pixels on the original sensors, plus image processing.

    Add to that the effects of JPEG/MPEG, which does all sorts of manipulation to compress the file, and what you end up with in your finished file, pixel-for-pixel, is nowhere near a simple pixel map of what the CCD "saw".

    Also, cameras with electronic image stabilisation waste a band of pixels around the edge of the picture to allow the picture to "slip", so although these might have a given resolution, it will likely be reduced if the image stabiliser is on.

    In summary, the more "effective" pixels the better, as these are the ones providing the original source for the picture, before all the processing stages start mangling things...
     

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