Sony Ps3 eye Camera. Dust on the sensor issues.
Avid D.I.Y headtracker wants the IR filter removed....
Crack open camera lens, remove IR filter.
Sensors can see infra red, we can't, so we don't need the camera to see in that spectrum.
But wait IR leds need to be seen by the camera so we take the IR filter out.
Great. Good work. Top marks.
we do let DUST in.
and this is hard to detect when your camera is up and running.
Does your tracking "freak out" every now and then?
and no amount of fiddling will fix it?
Well try this:
Open the Cl -eye folder and run CL -eye test.
Remove band pass filters.
Set the camera to normal brightness etc.
Aim camera at blank sheet of clean white paper. ( aprox 100mm away is fine.)
Notice any small dark smudges?
Move the camera around, if the smudge moves, it's on the paper.
Find a not moving smudge.
Whip out a going IR led and Aim it at that dark smudge, quite close to the camera.
Does the IR led suddenly get LARGER and/or Distorted?
You may have dust on your sensor.
and that will ruin your head tracking at that teeny tiny spot on the sensor.
Cl eye test.jpg 576.47KB 0 downloads
The above pic is of my camera pointing at a white sheet of paper reasonably well lit.
It took me at least FOUR goes to get the TINY specs of dust off the sensor.
( unplug camera, unscrew lens housing. ( two screws on back of P.C.B, brush off dust, refit lens, plug in and test....)
Looks quite clean? I think so too.
I did have to use a pair of binoculars to see the specs but once I got the hang of
seeing them, blinking heck, they were like boulders on a billiard table.
To clean them off I used a really fine clean paintbrush. Synthetic sable I think.
Now the interesting thing is that this spec of dust on the sensor only really ruins the
tracking if the sensor and spec of dust and IR led happen to be perfectly lined up.
Waving your head around a metre away from the camera with your hat clip widget
probably WILL NOT DETECT the dust spec. Until you get it BANG ON, then it will.
and this is not easy to do on purpose but you can do it accidentally every now and then
while looking every way at once to see if Ice_age is on your tail...
Dust can get your killed!
Don't be a chump like me and put up with random tracking.
Check for dust!
PS. An after thought. The back of the lens can have dust on it too. This is less problematic but never the less...
Hold the lens pointing UP ( the back of the lens is down the front is up. ) now brush any dust off.
Holding the lens in this way will stop dust settling back onto the rear element. ( the one you just cleaned. )
It's all to do with gravity.
NEVER BLOW ON ANYTHING. You are just spreading moisture from your lungs everywhere.
If you must blow things off use clean canned air.... or a blower bulb.
but really you are just blowing dust everywhere....