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2012-08-27
, 13:40
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Posts: 395 |
Thanked: 509 times |
Joined on Jan 2011
@ Brisbane, Australia
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#3
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Found a piece of broken filter from where I took it out to compare before/after, top is holding piece of the filter infront of the LED and the bottom is without it.
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2012-08-30
, 15:56
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Posts: 395 |
Thanked: 509 times |
Joined on Jan 2011
@ Brisbane, Australia
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#4
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It would seem not many people find IR too interesting.
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2012-09-14
, 18:15
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Posts: 2,290 |
Thanked: 4,133 times |
Joined on Apr 2010
@ UK
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#5
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Is there a reason you are using 940nm LED's?
You should get a better night picture with a lower frequency.
The only benefit of using higher frequency IR is to make it more invisible to humans.
You should get a better night picture with a lower frequency.
The only benefit of using higher frequency IR is to make it more invisible to humans.
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2012-09-14
, 19:34
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Posts: 1,680 |
Thanked: 3,685 times |
Joined on Jan 2011
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#6
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How much was the spare camera?
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N900: One of God's own prototypes. A high-powered mutant of some kind never even considered for mass production. Too weird to live, and too rare to die.
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2012-09-14
, 19:54
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Posts: 2,222 |
Thanked: 12,651 times |
Joined on Mar 2010
@ SOL 3
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#7
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Originally Posted by sixwheeledbeast
isn't it the other way round? Seems more intuitive to assume a frequency higher on a band below visibility is more visible than a frequency far off the visible range.
Is there a reason you are using 940nm LED's?
You should get a better night picture with a lower frequency.
The only benefit of using higher frequency IR is to make it more invisible to humans.
/j
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Maemo Community Council member [2012-10, 2013-05, 2013-11, 2014-06 terms]
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MCe.V. foundation member
EX Hildon Foundation approved Maemo Administration Coordinator (stepped down due to bullying 2014-04-05)
aka "techstaff" - the guys who keep your infra running - Devotion to Duty http://xkcd.com/705/
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First USB hostmode fanatic, father of H-E-N
Maemo Community Council member [2012-10, 2013-05, 2013-11, 2014-06 terms]
Hildon Foundation Council inaugural member.
MCe.V. foundation member
EX Hildon Foundation approved Maemo Administration Coordinator (stepped down due to bullying 2014-04-05)
aka "techstaff" - the guys who keep your infra running - Devotion to Duty http://xkcd.com/705/
IRC(freenode): DocScrutinizer*
First USB hostmode fanatic, father of H-E-N
| The Following User Says Thank You to joerg_rw For This Useful Post: | ||
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2012-09-14
, 19:57
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Posts: 661 |
Thanked: 1,625 times |
Joined on Apr 2012
@ Croatia,Zagreb
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#8
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IR photography is awesome.Used to have an old camera and hacked it for this purpose 
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2012-09-14
, 20:32
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Posts: 2,290 |
Thanked: 4,133 times |
Joined on Apr 2010
@ UK
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#9
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Originally Posted by joerg_rw
No, although I do apologise were I said frequency I actually mean wavelength.
isn't it the other way round? Seems more intuitive to assume a frequency higher on a band below visibility is more visible than a frequency far off the visible range.
I deal with infra-red and cameras as part of my job.
Humans can see light between ~380nm and ~740nm.
IR covers from there to about 1mm.
IR LED's come in different wavelengths
I install these at work, the 850 is slightly visible (has a glow) whereas the 940 is invisible to the naked eye.
Using 850nm compared to white light reduces camera efficiency by ~25%, whilst at 950nM it can be reduced by over
60%.
Also less applicable here is the problem of focus shift, which is were a fixed lens camera becomes blurry while using IR.
The lower wavelength IR's reduce this effect.
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Last edited by sixwheeledbeast; 2012-09-14 at 20:35.
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2012-09-15
, 16:42
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Posts: 2,222 |
Thanked: 12,651 times |
Joined on Mar 2010
@ SOL 3
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#10
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Originally Posted by sixwheeledbeast
So actually "yes", since higher wavelength means lower frequency ;-)
No, although I do apologise were I said frequency I actually mean wavelength.
/j
__________________
Maemo Community Council member [2012-10, 2013-05, 2013-11, 2014-06 terms]
Hildon Foundation Council inaugural member.
MCe.V. foundation member
EX Hildon Foundation approved Maemo Administration Coordinator (stepped down due to bullying 2014-04-05)
aka "techstaff" - the guys who keep your infra running - Devotion to Duty http://xkcd.com/705/
IRC(freenode): DocScrutinizer*
First USB hostmode fanatic, father of H-E-N
Maemo Community Council member [2012-10, 2013-05, 2013-11, 2014-06 terms]
Hildon Foundation Council inaugural member.
MCe.V. foundation member
EX Hildon Foundation approved Maemo Administration Coordinator (stepped down due to bullying 2014-04-05)
aka "techstaff" - the guys who keep your infra running - Devotion to Duty http://xkcd.com/705/
IRC(freenode): DocScrutinizer*
First USB hostmode fanatic, father of H-E-N
I ordered a module on ebay, so I wouldn't break my current one.
I broke the one I bought, and broke my original one when I was removing it from the phone.
45 minutes later, disassembling and reassembling the phone twice (because after doing it once, the N900 doesn't turn on until you disassemble and reassemble again), I have a working infrared camera on my N900- other than the broken autofocus and damaged sensor from scratching it when removing the IR filter.
The light (in the "Light off" image) is from a 1.2v 20mA IR LED. I'll take some day pictures tomorrow, when it's day. Once my new module comes in, if I don't break it again I'll have nicer focused pictures.
Last edited by azkay; 2012-08-27 at 10:22.