Re: Re[2]: Monochrome Display
Angus Dorbie (dorbie++at++bitch.reading.sgi.com)
Wed, 5 Mar 1997 03:53:37 +0000
On Mar 4, 12:50pm, Rémi Arnaud wrote:
> Subject: Re: Re[2]: Monochrome Display
> WILLIAM_MARINELLI++at++ntsc.navy.mil wrote:
> >
> >
> > >>>>> "Rimi" == Rimi Arnaud <remi++at++remi.asd.sgi.com> writes:
> >
> > Rimi> Y.Kanou wrote:
> > >> Is there a fast way to display monochrome images rather than
> > >> color images?
> > >>
> > >> I know intensity(Y) is calculated by Y=0.3*R+0.59*G+0.11*B. But
> > >> I think this needs pixel-level calculation and costs much.
> > >>
> > >> I would like to find a more efficient way if any.
> > >>
> > >> Thanks in advance.
> > >>
> >
> > Rimi> The easiest way is to add a small pasive electronic device
> > Rimi> that does the above signal merging from the R,G,B
> > Rimi> signal. Some displays directly have this capability (like the
> > Rimi> color tunning on your TV)
> >
> > Rimi> Sometime a little of electronic is better than lot of
> > Rimi> software !
> >
> > An application of such a tradeoff involves the use of simulation
> > for night vision goggles.
>
> It was not mentioned by Y.Kanou. Is it for a NVG simulation ? In that
> case you certainly can have some time between a color display and the
> switch to a monochrome display. So It can be done by having a Monochrome
> database as adviced by a previouspost.
>
> The #1 problem in NVG simulation is to get a low level luminance, with a
> lot of contrast. If you reduce the luminance by changes in the image
> generator you end up using only a few bits of the DAC's and have a
> poor output signal with not enough contrast.
>
> One posibility is to keep the maximum luminance in the Image Generator,
> so you have a good signal with a lot of resolution, and to add a luminance
> information to the projector. Now, the display technology has the same
> problem, so to have a good result a solution is to add a filter on the
> green tube that reduce the global luminance after the projector.
>
> Anybody has more idea on that subject ?
Two polarising filters on the "toilet roll tubes" with an adjustable
angle on the second for gain control. If you motorised the filter you
could even have high quality AGC.......garage VR.
This might be quite nice if added to something like n-Visions goggles.
Cheers,
Angus.
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on Mon Aug 10 1998 - 17:54:51 PDT