This is not a new topic. But it's still quite intriguing to computer vision research society. Most past research focused on analysing the visible spectrum. Very few of us noticed the invisible spectra including the near-infrared (NIR) spectrum. These lights are not sensible by human eyes but can be recorded by electronic devices. These invisible spectra offer some useful properties that we can not get from the visible one. I'm not going to discuss them here. One interesting point is to combine visible spectrum with the invisible ones and see what we can get.
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| Figure 1. A printed RGB cube. The NIR response doesn't depend on the colour
value, except for black, which is (in this case) made of NIR-absorbing
pigments. This image is taken from [1].
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You may follow [1] to find out more about NIR imaging and how to modify a NIR camera.
References
[1] C., Fredembach. "Near-Infrared Imaging", Clement's near-infrared page: http://ivrgwww.epfl.ch/research/topics/nir.html, Feb. 19, 2009 [Jul. 16, 2012].
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