[opendtv] Re: The curse of Bayer pattern sensors

  • From: "John Shutt" <shuttj@xxxxxxxxx>
  • To: <opendtv@xxxxxxxxxxxxx>
  • Date: Sun, 9 Feb 2014 08:27:07 -0500

Not being a camera designer, I can't say for certain, but most high end cameras use a prism to split the incoming light into three primary color RGB paths, and have three light sensors, CCD, CMOS, or whatever devices they use these days. It would seem to me to be trivial to either physically or mathmathetically selectively filter each color appropriately.

Also, many video systems (downstream from the imaging element) don't work in the RGB space, but in the Y, R-Y, B-Y component space. I know from the good old analog (Betacam) days and the early digital (BetaSX) days that the Y channel was allocated twice the bandwidth (or number of bits) as either the R-Y or B-Y channels (a.k.a 4:2:2 sampling rate.) This too would stand in for a form of low pas filtering of the R and B channels, no?

Curious to hear other thoughts,


----- Original Message ----- From: "Olivier Houot" <olho_avatar_i@xxxxxxxxx>

Sorry for bringing up such a prehistorical concept, then, but i was
surprised by the fact, and thought other people on the list might be
unaware of it, too.

But then do you know how manufacturers usually work around the problem ?
Do they optimize for green, red/blue, or something in between ? (or
perhaps no low pass filter at all except lens natural MTF, and so much
the worse for sampling theory).

P.S. nice to see so many people are still monitoring Opendtv, i was

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