Determining relative motion as input

摘要: Input can be provided to a computing device based upon relative movement of user or other object with respect the device. In some embodiments, infrared radiation is used determine measurable aspects eyes user. Since human retina retro-reflector for certain wavelengths, using two different wavelengths measurement angles allow pupils quickly located and measured without requiring resource-intensive analysis full color images captured ambient light, which important portable, low power, relatively inexpensive devices. Various embodiments provide differing levels precision design that