Hello everyone!

This is my first post.. which expains a bit that im new to multitouch interfaces and technologies

Im trying to build a DI-Rear illumination setup.

The camera I have just purchased is a Philips SPC1000NC which looked to have an easy removable IR-Filter (small square of glass with a pink/red tint) on the back of the lens. This I have removed and placed a piece of a HD Floppy.

It still looks that the camera is receiving the same amout or atleast “too less” IR light, did I remove the wrong part of the lens? Also it still receives alot of normal light, like when holding a buring cigaret in front of it. Which IR leds should be best for this cam? 920nM?

For a test setup without projector, only to check if the camera and IR illuminators (which I have ordered) are working; Is it neccasary to have a special filter (like lee filter, mylar, vellum...) or something on the piece of clear glass? Is it also possible to use a mirror as diffusor?

PS: Let me know if any pictures are neccasary.

Greets,

WHiTE

It still looks that the camera is receiving the same amout or atleast “too less” IR light, did I remove the wrong part of the lens? Also it still receives alot of normal light, like when holding a buring cigaret in front of it. Which IR leds should be best for this cam? 920nM?

IR LEDs with 880nM are recommended, because most CCD chip can’t detect IR light with higher frequencies..

spc1000nc has a cmos chip.. sensor.. or is that something else?

CMOS sensors have a bit more sensitivity to the upper IR wavelengths than CCDs.

My Logitech has a CMOS sensor and it picks up my 940 nm IR LEDs just fine.

My SPC 1000 works fine with 940 nm LEDs. I modded it myself yesterday with a piece of exposed negative film as replacement for the IR-Filter. No problems here, everything is working just fine

IR LEDs with 880nM are recommended, because most CCD chip can’t detect IR light with higher frequencies..

You mean.. lower frequencies ?

kihaki - 14 September 2008 12:23 PM

My SPC 1000 works fine with 940 nm LEDs. I modded it myself yesterday with a piece of exposed negative film as replacement for the IR-Filter. No problems here, everything is working just fine

IR LEDs with 880nM are recommended, because most CCD chip can’t detect IR light with higher frequencies..

You mean.. lower frequencies ?

I think he means larger ‘wavelength’, because it isnt measured in frequency (Hz). FYI nm == nanometer.

Falcon4ever - 15 September 2008 03:58 AM

kihaki - 14 September 2008 12:23 PM

My SPC 1000 works fine with 940 nm LEDs. I modded it myself yesterday with a piece of exposed negative film as replacement for the IR-Filter. No problems here, everything is working just fine

IR LEDs with 880nM are recommended, because most CCD chip can’t detect IR light with higher frequencies..

You mean.. lower frequencies ?

I think he means larger ‘wavelength’, because it isnt measured in frequency (Hz). FYI nm == nanometer.

Wavelength = 1/ Frequency * speed. So Larger Wavelength = lower frequency.
Wavelength and Frequency measure exactly the same thing. So larger wavelength is the same as lower frequency (If we assume the speed of light is a constant). But whatever..

Don’t argue, build more natural interfaces NOW

This is my first post.
I have couple of problems

1. I bought Logitech Quick cam $ 29 and it has 30 fps and works fine. Now the problem is if i run with skype and stuff like that it works fine; however when i run any of applications it will reboot my system.

2. Also my cam is able to detect Ir light i checked it using remote control so does it mean that i donot have to remove any kind of filter.

Please help me ASAP.