Re[2]: Monochrome Display
WILLIAM_MARINELLI++at++ntsc.navy.mil
Tue, 04 Mar 97 07:35:13 EST
>>>>> "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.
The stimulation approach involves the use of actual night vision
goggles where the visual display would emit light that would
best cause the NVG output to resemble what one would see in the
real aircraft at night. A somwhat traditional hack includes
tweaking the color tables and the gamma correction curves.
Unfortunately current display technology doesn't really
approximate the night sky terribly well.
The simulation might use what amounts to viewing the display
through two toilet paper tubes where the displayed image is
monocrome green and NVG effects such as noise, blooming, halos,
automatic gain control in shadowed regions, etc.
Just off the top of my head, Performer issues in NVG would
include:
(1) A culling volume larger than the viewing volume because
light sources can have a significant effect on the scene
illumination.
(2) An Isector from the eyepoint to the moon and other
significant light sources to see if the light sources are
occluded by the terrain.
(3) If NVGs are simulated, noise injestion could be accomplished
throug glDrawPixels, I suppose.
My .02 worth.
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on Mon Aug 10 1998 - 17:54:50 PDT