Re: 'Son of Apollo' EVA cameras...
- From: meiza<meiza@xxxxxxxx>
- Date: Thu, 2 Mar 2006 23:47:15 +0200 (EET)
Kevin Willoughby <KevinWilloughby@xxxxxxxxxxxxxxx> wrote:
In article <dtem93$1qu$1@xxxxxxxxxxxxx>, meiza@xxxxxxxx says...
Kevin Willoughby <KevinWilloughby@xxxxxxxxxxxxxxx> wrote:
3, [...] To the extent that "sharpness" is a function of resolution, itYes, chroma is the majority of the signal for human perception
is more correlated to the lumance resolution than the chroma resolution.
Please reread what I said. Sharpness is more correlated to lumance than
chroma.
Yes, sorry, I accidentally interchanged the terms here, you're right.
The brightness is more important than the hue.
I'd encourage you to learn about more digital cameras. Nearly all
consumer digi-cams use Bayer patterns.
Ok, you're right again, I thought you meant the 45 degree tilted
Kodak sensors, which are the minority.
The GRGB mask / Bayer pattern is the thing which we have been talking
about all along. For full color, your resolution can be approximated
to be one quarter of the amount of monochrome pixels in the worst case.
Not much more for multicolored and uncontinuous data and easily more
for more grey or green landscapes and soft changes. It depends on
the functions interpolating the data at non-measured locations and
they are optimized for on-earth typical photography. (Getting 9
million 3-color pixels from 4.5 million greens, 2.3 million reds and
2.3 million blues.)
This system works fine for static landscapes, but is horrid for moving
subjects. The three successive exposures are at different times, so
moving objects aren't sharp, they are blurred.
True. They'd probably be good for rover science cameras and not for
driving stuff (that wouldn't be quality-critical anyway) or handhelds.
By the way, this multi-filter technique was used way back, in 1915,
for color photographs:
http://www.loc.gov/exhibits/empire/object.html
Moving smoke looks funny since it moved while the filter was changed.
Many digital video cameras have prisms to separate light to three
Mostly cost. (Note that some lower priced dSLRs don't use pentaprisms
for cost reasons.) There are also light-loss issues -- with beam
splitters, each color exposure receives at best 1/3 of the available
light; in practice, beam splitters cost you two full stops.
That prism price thing must be the limitation.
The light power? So does the filter mask cost light power. A green
photon has only a half chance to hit a green sensor, and a blue or
red one only one in four to hit their own sensors. I wonder why
they don't do super-sharp super-fast maskless black & white digital
cameras. :)
.
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