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07-03-2006, 12:22 PM
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#406
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Constant Bitrate
Join Date: Feb 2006
Posts: 112
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Quote: Originally Posted by at_b
Just a observation, when i tried out the nitemax in darkness, higher f number (f1.6) made the ocassional lights appear like bright suns in the displays while lower f(1.4 i belive) didn t wash out the screen as much and made everything look a lot better
I hope that helps
I'm guessing that it is actually the other way around. A lower f-Number is a larger aperature (larger iris opening) and therefore more sensitive to bright lights.
If you are using an adjustable iris lens, the f-Number rating is usually the lowest the lens can reach with a wide-open iris. Closing the iris will increase the f-Number proportionally.
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07-03-2006, 01:29 PM
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#407
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Constant Bitrate
Join Date: Feb 2005
Location: Boston,MA
Posts: 204
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Quote: Originally Posted by NiteMax Mark
I'm guessing that it is actually the other way around. A lower f-Number is a larger aperature (larger iris opening) and therefore more sensitive to bright lights.
If you are using an adjustable iris lens, the f-Number rating is usually the lowest the lens can reach with a wide-open iris. Closing the iris will increase the f-Number proportionally.
Well even thought I expected the same thing I found out that by closing the iris my glare increased! That is for relatively open iris settings, when the iris was almost closed then it was all dim of course, no more glare but no detail also. I guess there is less contrast of the surrounding and the bright light wen the lens is bigger so the ccd can compensate better? i don't really know...
__________________
Will never be DONE! There is always something to add
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12-03-2006, 01:30 PM
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#408
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Variable Bitrate
Join Date: Nov 2006
Location: Romania
Posts: 297
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?
Quote: Originally Posted by NiteMax Mark  Pretty much everything is still available.
Mark, just left you a message on private. Any answer for me?
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12-03-2006, 06:19 PM
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#409
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Raw Wave
Join Date: Apr 2005
Location: Boston, MA
Posts: 1,800
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Quote: Originally Posted by spaceskater Well even thought I expected the same thing I found out that by closing the iris my glare increased! That is for relatively open iris settings, when the iris was almost closed then it was all dim of course, no more glare but no detail also. I guess there is less contrast of the surrounding and the bright light wen the lens is bigger so the ccd can compensate better? i don't really know...
Now that I have capture working on my carpc, I'm thinking of trying to drive the Iris through software, capturing a single frame like twice a second, and then using a PIC or something to control how open the iris is.
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12-27-2006, 05:07 PM
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#410
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FLAC
Join Date: Mar 2005
Location: NY
Posts: 1,142
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how is that going?
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Carputer Progress: Here we go again...
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12-27-2006, 05:15 PM
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#411
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Raw Wave
Join Date: Apr 2005
Location: Boston, MA
Posts: 1,800
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Quote: Originally Posted by Genesisfactor how is that going?
Got sidetracked in dependency hell with my media player. Every time I update one thing, something else breaks. Haven't touched anything carpc in like 10 days in disgust. 
I don't think HW-wise , there would be anything that difficult about driving the iris, though software, that's a bit of a different story. I'd be worried about cpu utilization.
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12-27-2006, 05:34 PM
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#412
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FLAC
Join Date: Mar 2005
Location: NY
Posts: 1,142
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If it ain't broke :P...
I'm soryr to hear that. Still didn't get DSL to work either, so i know what you mean. I feel like the moron who can't get Unattended XP to install correctly lol.
__________________
Carputer Progress: Here we go again...
THE GF THEME
Genesis has speed
Genesis has class
Genesis sent money
before your a__;)
Join the fight against carputters. EMAIL ME!
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12-27-2006, 05:41 PM
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#413
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Raw Wave
Join Date: Apr 2005
Location: Boston, MA
Posts: 1,800
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Quote: Originally Posted by Genesisfactor If it ain't broke :P...
I'm soryr to hear that. Still didn't get DSL to work either, so i know what you mean. I feel like the moron who can't get Unattended XP to install correctly lol.
It's a pain, I had to ***** with it before I put it in. The thing that really bothers me is that the code that won't compile (smpeg) hasn't changed in like 4 or 5 years, but it was on the system before. The only thing I can think of is that in the last four years there was some change in the friend syntax in C++, unfortunately, my C++ is rusty as all hell and the reason it was previously working was because I installed it as a package through apt.
I think I'm done using linux testing distros from now on and sticking with stable ones. Way too much of a moving target.
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12-27-2006, 06:18 PM
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#414
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Constant Bitrate
Join Date: Feb 2006
Posts: 112
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Quote: Originally Posted by shotgunefx Now that I have capture working on my carpc, I'm thinking of trying to drive the Iris through software, capturing a single frame like twice a second, and then using a PIC or something to control how open the iris is.
Some auto-iris lenses accept video as an input and they'll do all of the work for you in terms of managing the iris. The DSP Based Ultra CCD Boards have drive outputs for the two main kinds of auto-Iris. It would be much better to let the CCD Board and lens do the job together they were desinged for.
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12-28-2006, 02:32 AM
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#415
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Raw Wave
Join Date: Apr 2005
Location: Boston, MA
Posts: 1,800
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Quote: Originally Posted by NiteMax Mark Some auto-iris lenses accept video as an input and they'll do all of the work for you in terms of managing the iris. The DSP Based Ultra CCD Boards have drive outputs for the two main kinds of auto-Iris. It would be much better to let the CCD Board and lens do the job together they were desinged for.
The thing is Mark, I tried letting the camera do it, and it still was horrible with the glare.
I haven't tried many, but the only one that worked acceptable in my book was the giant Compustar one I have. But that thing had a lot of options I doubt I'll ever find on a small lens. It works from the video signal but has several adjustment screws to impact the processing (center weighted <-> point weighted, etc)
Here's a pic with the auto-iris lens (Not the compustar)
And the vid...
6mb divx
Maybe there is something I'm missing, but it still gets blinded pretty bad.
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12-28-2006, 02:20 PM
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#416
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FLAC
Join Date: Mar 2005
Location: NY
Posts: 1,142
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lol that reminds me...got any more of those huge lenses shotgun?
__________________
Carputer Progress: Here we go again...
THE GF THEME
Genesis has speed
Genesis has class
Genesis sent money
before your a__;)
Join the fight against carputters. EMAIL ME!
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12-28-2006, 03:02 PM
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#417
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Raw Wave
Join Date: Apr 2005
Location: Boston, MA
Posts: 1,800
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Quote: Originally Posted by Genesisfactor lol that reminds me...got any more of those huge lenses shotgun?
I think it's a no go. I saw the guy a couple months ago, he said he thought he tossed them but would check. Haven't seen him since.
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12-28-2006, 04:16 PM
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#418
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FLAC
Join Date: Mar 2005
Location: NY
Posts: 1,142
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dude...i would have to be paid to throw those things out THEY ARE THE HOTNESS. Those lenses are so big, you can look through clothes!
__________________
Carputer Progress: Here we go again...
THE GF THEME
Genesis has speed
Genesis has class
Genesis sent money
before your a__;)
Join the fight against carputters. EMAIL ME!
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12-29-2006, 02:37 PM
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#419
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Raw Wave
Join Date: Apr 2005
Location: Boston, MA
Posts: 1,800
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Quote: Originally Posted by Genesisfactor dude...i would have to be paid to throw those things out THEY ARE THE HOTNESS. Those lenses are so big, you can look through clothes!
He had tons of stuff like that. Was really into CCTV, so he'd buy things just to buy them, then when he moved, he had to ditch a lot.
I just found the control boxes off of those IR cameras with illuminators. Apparently they were from Atari and used for motion capture.
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01-03-2007, 05:53 PM
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#420
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Low Bitrate
Join Date: Dec 2005
Posts: 78
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Wow this thread still lives on! Heck I haven't posted on this board since last June.  I need to get back to getting my nitemaxx setup moving. 
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