It all depends what you call 'high-end'. I'd certainly class the ARRI Alexa and Amira, and the REDs as high-end, and they're all single sensor Bayer. The Sony F65, F55 and F5 are all 'high-end' as far as I'm concerned, and they're all single-sensor CMOS as well. And that's not even starting on the DSLRs, at least one of which is good enough to be classed as 'high-end' for HDTV as far as the image performance is concerned.
At the other end of the scale, my home HD camcoreder is a Panasonic HC-x920 which has 3 CMOS sensors, and most cerianly isn't high-end (although it;s not far off as far as image performance is concerned).
And I can say all that for certain, no guess-work.As regards YPbPr processing's concerned, you can't think of it as low-pass filtering for any of the RGB channels, because the filtering depends on the colour and luminance level in most cameras. Coded signals save bandwidth, but the relationship between the coded bandwidths and the primary bandwidths isn't simple, because of non-constant-luminance coding.
A On 09/02/2014 13:27, John Shutt wrote:
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, John----- 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 wondering.---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways:- Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.
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