IMAGE SCANNER

A hand-held image scanner can scan an object larger than the scanner itself. Successive multiple partial images scanned in the Y (or longitudinal) direction) are combined to form a single image by keeping track of the position and motion of the scanner in both the Y direction and the X (or latitudinal) direction. The scanner measures distance moved in either the X or the Y direction, but it cannot measure in both directions at once, nor does it scan when it moves in the X direction.