Weaknesses and Speculation
The high cost of optical tracking systems has made this a limited area of research, although with inexpensive CMOS cameras this is becoming more viable and will likely be replacing radar and other lower resolution technologies in the near future.
Leveraging the millions of cameras being developed for Cell Phones, Web Cams, and other applications, CMOS cameras will likely win in short range applications due to costs, even though the visible wavelengths are less optimal.
Read more about this topic: Optical Motion Tracking
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