chapter  14
Distance Measurement
Pages 18

Distance measurement, at its most basic, is concerned with determining the length of a unidimensional line joining two points in 3-D space. O£entimes, a collection of distance measurements is called for, so that the shape, the orientation, or the changes in position of an object can be resolved. œerefore, one must consider not only the measurement of distances but also their spatial and temporal distributions. œe terminology “ranging” will be used in reference to systems that perform single sensorto-target measurements, “range imaging” for systems that collect a dense map or grid of spatially distributed range measurements, and “position tracking” for systems that record the time history of distance measurement to one or several targets.