[opendtv] The curse of Bayer pattern sensors

  • From: Olivier Houot <olho_avatar_i@xxxxxxxxx>
  • To: opendtv@xxxxxxxxxxxxx
  • Date: Sat, 08 Feb 2014 16:08:31 +0100

This interesting discussion by John Galt of Panasonic exposes a logical
flaw of the design i was not aware of :


In short red and blue pixels have half the density of green ones.
Hence they provide half the sampling frequency of green ones.
You are supposed to have a low pass optical filter in front of your
sensor at half the sampling frequency.
If you optimize it for green, you let aliasing frequencies for red and
blue in.
If you optimize for red/blue, you throw away half the green bandwidth
(essentially luminance).

To me, it means a properly filtered 4K sensor would have a practical 2K

Also inside the discussion, the story of how Imax engineers measured the
resolution of their system to be less than 4K, and other interesting

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