| http://www.w3.org/ns/prov#value | - This possibility is further reduced by maintaining the lower beam at a grazing height over the surface underlying the monitored region. [0138] While an embodiment such as described with FIG. 12 uses the vertical size of the image for the light pattern formed by the object intersecting the bottom beam, other embodiments may use other characteristics of the light patterns formed on the images.
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