1. A system for generating orientation information, the system comprising: a reflector; an image collection system configured to generate a first set of image data and a second set of image data, wherein the first set of image data includes a stronger indication of the reflector than the second set of image data; and a processor configured to use the first set of image data and the second set of image data to generate orientation information related to the reflector, wherein the orientation information characterizes rotation of the reflector about an axis; wherein the image collection system comprises an imager and first and second light sources that generate light of different wavelengths, the first light source and the second light source having similar illumination angles and wherein a wavelength-selective filter is located between the light sources and the imager, the first set of image data being generated in response to a reflected portion of light from the first light source and the second set of image data being generated in response to a reflected portion of light from the second light source.