It’s 4am Monday morning and I’m ready to punch through my screen!
I am not getting any IR reflection whatsoever!

I have a DI setup. My camera can see IR if I point the light directly into it, but when I get everything set up and touch the screen there are no blobs or anything.

I’m using regular glass and tracing paper and have tried putting the paper on the touch side and camera side of the screen with no results.

Please help! I will clarify and give more details if you need me to.

jordanfb - 07 July 2008 05:09 AM

It’s 4am Monday morning and I’m ready to punch through my screen!
I am not getting any IR reflection whatsoever!

I have a DI setup. My camera can see IR if I point the light directly into it, but when I get everything set up and touch the screen there are no blobs or anything.

I’m using regular glass and tracing paper and have tried putting the paper on the touch side and camera side of the screen with no results.

Please help! I will clarify and give more details if you need me to.

please provide a screenshot of touchlib (all those screens) it will allow of to see beter what kind of filters you added and what you see..

i can post some screenshots later today.
You said in the chat room that I need to remove the IR filter, my webcam may have that IR coating on the glass - which I hope isn’t the case - it is a logitech quickcam chat. Any experience with that model?
THe cam has two parts that may have the filter. THe IR filter might be inside the lens and I’ll have to somehow take it apart or the IR filter might be the piece of glass glued over the image sensor. There was no little filter that I could just easily take out like in the XBox webcams, so I’ll bet the glass has that stupid coating.

I see on this thread that several people used a logitec quickcam and removed the IR filter..
Yo can often recognise is by a small red reflection..

yeah, i’ve seen that thread and my cam is in the list.
I read further in the thread and found a couple people explaining that the filter is a thin piece of glass that you just pop off with a knife - that piece of glass in my cam just might be the IR filter. I’m hesitant though since it is glued to the image sensor, but right now I’ve got nothing to lose!!!!
HAVE YOU DONE THIS BEFORE? WAS YOUR IR FILTER A PIECE OF GLASS GLUED ON?

THANKS FOR THE HELP SO FAR…

I have an MS vx1000 webcam, after removing the lens holder i saw a red shiny piece of glass/plastic and removed that, and that did the trick.. it was pretty easy (although i did break it)

oh my! i found a how-to for my exact camera! this has got to be the winner for most difficult webcam IR mod! here is what it takes:  http://www.instructables.com/id/E2B12VANM8EP287H1D/

thanks for all your help

jordanfb - 07 July 2008 02:58 PM

yeah, i’ve seen that thread and my cam is in the list.
I read further in the thread and found a couple people explaining that the filter is a thin piece of glass that you just pop off with a knife - that piece of glass in my cam just might be the IR filter. I’m hesitant though since it is glued to the image sensor, but right now I’ve got nothing to lose!!!!
HAVE YOU DONE THIS BEFORE? WAS YOUR IR FILTER A PIECE OF GLASS GLUED ON?

THANKS FOR THE HELP SO FAR…

Nope, that’s not the IR filter… The filter is in between the two clear lenses inside the lens case; you can easy recognize it as a small blued square. I have two or three of those cameras from different versions and the filter is placed always the same. Be carefull dissasembling the lenses case to avoid damage the (sometimes plastic) lenses.

Cheers!

Okay, I have DI setup using a webcam w/ IR filter removed and two layers of photo negatives. My screen is thin glass (that’s regular old glass, not acryllic) w/ tracing paper attached on the camera side of the glass. I have one IR light w/ 36 leds that I think are rated at 920nm (whatever the common 900 rating is) and it has a diffuser directly on top of it.

So, with all that in mind here are two screen shots taken in a dark room w/ no projector on and no background subtraction (hitting th e “b” button). THis is what I get:

if you need me to take more I’ll do it. I’ll turn the projetor on, move my IR light around, remov background, etc.

You sure you are using the config.xml for rear illumination setups? If you are sitting in a dark room try the rear4-simplehighpass.xml. Rename it to config.xml and delete the old one. I think the one you are using is meant for FTIR setups?

The ir light is not spread evenly so that won’t really work well as you won’t be able to detects blobs on your complete screen.
Also you’re using only the brightness/contrast filter....
Check the config directory there is a Rear DI config file… please use that example (overwriting your existing one) however you’ll have to replace the avi file with the dsvlcapture part of your existing config file.. (sorry don’t have my old di config file here..

that puppy right there (see pic)
is that not the right Config? where is the the one you are referring to?

(this is touchlib beta 2.0 if that makes a difference)

Try and use this config.xml. Delete the old one in the folder \Touchlib\ and replace it with this.

delete this and replace it with the config.rar? I dont know how stupid this sounds, but what is .rar? I swear I have seen that extension before....

Delete that file yes. A .rar file is like a .zip file. You’ll need winrar to unpack it though.. http://rarlab.com