Sigma/Foveon Questions
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From: David J Taylor on 25 Apr 2010 04:19 "Ray Fischer" <rfischer(a)sonic.net> wrote in message news:4bd3ec93$0$1610$742ec2ed(a)news.sonic.net... > David J Taylor <david-taylor(a)blueyonder.co.uk> wrote: >>> however, the total number doesn't change. there are 12 million on the >>> sensor and 12 million in the image, or however many the sensor has. >> >>There are 12 million monochrome pixels on the sensor, > > No, there are 4.6 million pixels. Any other claim is a lie. > >> interpolated to 12 >>million colour pixels. The sensor only has 3 million red pixels, but > > Learn what "pixel" means. > > -- > Ray Fischer > rfischer(a)sonic.net Ray, This part of the thread had evolved to being about Bayer in a hypothetical 12MP DSLR, and whether or not spatial interpolation was involved. Not Foveon. David
From: nospam on 25 Apr 2010 06:17 In article <zv0DJBEG8A1LFw7q(a)kennedym.demon.co.uk>, Kennedy McEwen <rkm(a)nospam.demon.co.uk> wrote: > Furthermore, a 640x480 sensor with a Bayer CFA is four interleaved > arrays of 320x240 red, green, blue and green pixels. The output is three > overlayed arrays of red green and blue pixels. Going from 320x240 to > 640x480 *IS* upsizing! except that's not how bayer works
From: David J Taylor on 25 Apr 2010 06:30 "nospam" <nospam(a)nospam.invalid> wrote in message news:250420100317330679%nospam(a)nospam.invalid... > In article <zv0DJBEG8A1LFw7q(a)kennedym.demon.co.uk>, Kennedy McEwen > <rkm(a)nospam.demon.co.uk> wrote: > >> Furthermore, a 640x480 sensor with a Bayer CFA is four interleaved >> arrays of 320x240 red, green, blue and green pixels. The output is >> three >> overlayed arrays of red green and blue pixels. Going from 320x240 to >> 640x480 *IS* upsizing! > > except that's not how bayer works How does it work, then? David
From: nospam on 25 Apr 2010 08:14 In article <hr15k0$b8n$1(a)news.eternal-september.org>, David J Taylor <david-taylor(a)blueyonder.co.uk.invalid> wrote: > >> Furthermore, a 640x480 sensor with a Bayer CFA is four interleaved > >> arrays of 320x240 red, green, blue and green pixels. The output is > >> three > >> overlayed arrays of red green and blue pixels. Going from 320x240 to > >> 640x480 *IS* upsizing! > > > > except that's not how bayer works > > How does it work, then? as i said a few posts back, each pixel calculates the missing components and pixels get reused. there are a number of papers online about various algorithms. here's one: <http://www.ece.gatech.edu/research/labs/MCCL/pubs/dwnlds/bahadir05.pdf>
From: Pete on 25 Apr 2010 08:33
On 2010-04-25 13:14:13 +0100, nospam said: > In article <hr15k0$b8n$1(a)news.eternal-september.org>, David J Taylor > <david-taylor(a)blueyonder.co.uk.invalid> wrote: > >>>> Furthermore, a 640x480 sensor with a Bayer CFA is four interleaved >>>> arrays of 320x240 red, green, blue and green pixels. The output is >>>> three >>>> overlayed arrays of red green and blue pixels. Going from 320x240 to >>>> 640x480 *IS* upsizing! >>> >>> except that's not how bayer works >> >> How does it work, then? > > as i said a few posts back, each pixel calculates the missing > components and pixels get reused. there are a number of papers online > about various algorithms. here's one: > <http://www.ece.gatech.edu/research/labs/MCCL/pubs/dwnlds/bahadir05.pdf> Thanks for the link, a most interesting document. -- Pete |