A method and apparatus for detecting motion in digitized images involves the use of discrete cosine transforms. A first step involves securing transponders along a length of an underground utility line at regular spaced intervals. The bridge circuit has switches controlled according to the PWM signal such that a driving current alternately flows to and from a load. The export converter generates a document using scene images captured in a virtual world based on user-specified camera positions. In addition, the interface device communicatively can couple the plurality of memory arrays to the processor module using the plurality of routing elements and the interconnects. At least a portion of the first via is between the first footprint and the opening.