Friday, March 6, 2009
Wii Remote IR sensitivity
One of the open questions about using the Wii Remote's infrared-sensitive camera has been which part of the infrared spectrum it was most sensitive to. Our plan to track retroreflective strips on the course will work best if we flood the scene with IR illumination in the right range.
There is no official word on the subject from Nintendo, but there is anecdotal evidence that the optimal wavelength is 940 nm.
I have tested IR illuminators at five different fixed wavelengths: 850, 870, 890, 940, and 950 nm. My results agree with those above - the Remote's camera seems to be most sensitive to illumination at 940 nm.