DISPLACEMENT SENSING BY COMPARING MATRICES OF POINTWISE MEASUREMENTS

摘要

Determining a displacement of a substantially rigid item (106) relative to a frame of reference (110) between a first time and a second time is described. At the first time, a first set of pointwise measurements of a physical property of the item taken at a plurality of fixed locations relative to the frame of reference (110) is acquired (202). At the second time, a second set of pointwise measurements of the physical property taken at the plurality of fixed locations is acquired (208). A first matrix derived from the first set of pointwise measurements is compared (212) to a second matrix derived from the second set of pointwise measurements to determine the displacement.