camera sensitive to IR

[bk227865]

The cheap camera lens seems to have no IR filter.
So this may account for a lot of the blue fringes we see around bright spots in the photograps.

seems to be a cost saving tactic on many cheap digital camera's

The infrared light is detected as blue light , but has a different refraction index, so it shows up as an out of focus blue fringe around bright objects.

I have included a picture shining an remote to the camera to show the effect.

The remote emmits no visible light , yet the camera detects a blue lightsource.

[bk227865]

If you place a filter in front of the lens that filter out the VISIBLE light you can even make an "X-ray" camera out it for extra fun stuff.

Im not gonna explain that any further here , just look it up on google with words like "sony" "x-ray" "camera" and maybe "clothes" :twisted: :twisted: :twisted:

[knowsleyroader]

If you place a filter in front of the lens that filter out the VISIBLE light you can even make an "X-ray" camera out it for extra fun stuff.

Im not gonna explain that any further here , just look it up on google with words like "sony" "x-ray" "camera" and maybe "clothes" :twisted: :twisted: :twisted:

Spoilsport ! :wink:

[NexNo]

actually i've never seen a mobile phone camera or any pc-webcam that has an ir-filter. they all show ir-light. :wink:

[Bonzo]

I would go as far as to say: you are all wrong!
Our cameras have IR filters.
All webcams do!

The only problem is; it's not good enough..
Get yourself a cheap logitech camera, dismantle it, remove a small square piece of glass.

Connect the camera and see how much interference IR is giving!

The filters remove IR "radiation" light, but not enough to dampen a IR remote signal..

[NexNo]

I completly disassembled two webcams until now and there was no such thing unless the lens itself has ir-filter capabilitys. that doesn't have to mean that that's the standart case, but the pictures the cams took looked pretty much the same even with all crap removed. I don't think cheap cams (and pretty much all cams are cheap unless it's a digicam for 200$ or more) include an ir-filter.

[knowsleyroader]

If you place a filter in front of the lens that filter out the VISIBLE light you can even make an "X-ray" camera out it for extra fun stuff.

Im not gonna explain that any further here , just look it up on google with words like "sony" "x-ray" "camera" and maybe "clothes" :twisted: :twisted: :twisted:

Did you take that with your wizard ?

[Bonzo]

I completly disassembled two webcams until now and there was no such thing unless the lens itself has ir-filter capabilitys. that doesn't have to mean that that's the standart case, but the pictures the cams took looked pretty much the same even with all crap removed. I don't think cheap cams (and pretty much all cams are cheap unless it's a digicam for 200$ or more) include an ir-filter.

Well, the IR filter I picked out if my Logitech quick cam looks like a normal piece of glass, but if you see it from the side, you either get a green/turquoise color or red/pink color from it..
Look at your lenses; got the same color reflections?

[NexNo]

nope. no reflections at the lens as far as I can see it. and no little piece of glass either. maybe logitech does that since it's a more expensive cam? mine was really cheap.. reeeally cheap ^^ like 8 euros or so. an old "pencam" that I teared appart got rid of the plastic case and "built" a new case out of sticky tape ;) looks like a phreaky cocoon but is 1/3 the size of the original.

[bk227865]

Did you take that with your wizard ?

Yes,

Some remote controls have a black looking piece of plastic in front.
That is actually a filter that let's IR pass through but not visible light.

So i demollished an old remote control and with the makeshift black plastic filter taped in front of the lens i took a picture. Then i took a regular picture for comparison.

As you can see the leaves on the tree's are much lighter when viewed in IR. That is because they reflect IR radiation , (protecting themself from getting sunburned)

Ideally the sky in the IR image should register as very dark blue , but too much normal red light is seeping through the plastic filter.

[mrwell]

LOL, all cameras I've test since I was a child can detect IR beams from a remote. no matter if they have IR filters or not... No I'm 30 years old :twisted:

[hanmin]

Interesting... I get the same thing with my Charmer camera.

However, I was trying to shine my IR Remote to act as a torch light in total darkness, but doesn't seems to work. I need a much stronger IR light source.

[tweakradje]

When our son was born I bought a wireless video camera. Then after doing some research I removed the IR filter (there is a professional name for it, can't remember) and bought myself 8 powerfull IR leds, connected them to 12V.
It was like daylight in the middle of the night ;O)

The IR sensitivity of CMOS and CCD generaly doesn't go to much down the spectrum. Heat from a body is below that range.

Cheers

[cozzykim]

http://www.kaya-optics.com/products/overview.shtml

For a good, basic explanation of NIR

[NexNo]

When our son was born I bought a wireless video camera. Then after doing some research I removed the IR filter (there is a professional name for it, can't remember) and bought myself 8 powerfull IR leds, connected them to 12V.
It was like daylight in the middle of the night ;O)

Wow, that's what I call surveillance :twisted: ... big parent is watching you... ^^

[molski]

The cheap camera lens seems to have no IR filter.
So this may account for a lot of the blue fringes we see around bright spots in the photograps.

seems to be a cost saving tactic on many cheap digital camera's

The infrared light is detected as blue light , but has a different refraction index, so it shows up as an out of focus blue fringe around bright objects.

I have included a picture shining an remote to the camera to show the effect.

The remote emmits no visible light , yet the camera detects a blue lightsource.

A few days ago, I was making a photo of my laptop and when I looked into the camera, I saw a little light blinking what turns out to be the infrared port of my laptop, but it soesn't bother me at all, did not have any problems yest with the pictures I took.

[knowsleyroader]

Did you take that with your wizard ?

Yes,

Some remote controls have a black looking piece of plastic in front.
That is actually a filter that let's IR pass through but not visible light.

So i demollished an old remote control and with the makeshift black plastic filter taped in front of the lens i took a picture. Then i took a regular picture for comparison.

As you can see the leaves on the tree's are much lighter when viewed in IR. That is because they reflect IR radiation , (protecting themself from getting sunburned)

Ideally the sky in the IR image should register as very dark blue , but too much normal red light is seeping through the plastic filter.

So If I go to a boot sale and find any old type remote with a docking big brown/black front cover over the ir would that work ?

[NexNo]

guys guys guys this will clear it all up ...
just read this
http://www.hoagieshouse.com/IR/
found here http://www.hackaday.com/entry/1234000110036028/

have fun browsing :wink: