| http://www.w3.org/ns/prov#value | - Because the surface of the object observed by the optical mouse sensor 301 may be either linearly flat in the x-y plane, or may be a nonlinear surface such as a sphere, in other embodiments, the mathematical algorithms 302-3 can be adjusted to map the x-axis and y-axis displacement data into spherical coordinates, cylindrical coordinates, or other system of coordinates in order to calculate the ob
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