Patent ID: 7609290

Claim:
An apparatus for detecting motion in an area, the apparatus comprising: an imaging device having a field of view that is smaller than the area; means for moving the field of view to vary the portion of the area that is covered by the field of view; means for storing a first set of image data captured by said imaging device when the field of view covers a first portion of the area and for storing a second set of image data captured by said imaging device when the field of view covers a second portion of the area, the second portion including a sub area that overlaps a sub area of the first portion to define an overlapping area; means for determining a fixed object image portion in the overlapping area; means for adjusting at least one of the first set of image data and the second set of image data based on the fixed object image portion and generating two sets of adjusted image data, each of the two sets of adjusted image data including overlapping area data corresponding to the overlapping area; and means for comparing the overlapping area data of the two sets of adjusted image data to determine if any objects in the overlapping area have moved.