Abstract: A computer input device includes a camera for capturing an image of a pattern on a surface. A processor in the computer input device determines equations for lines from the image of the pattern, applies the line equations to a transform to form transformed line equations, and uses the transformed line equations to determine the height of the computer input device above the surface.

Abstract: In an input device, a camera captures images of a surface. Using the images, the input device determines its orientation. Data representing the orientation of the input device and data representing the captured image are communicated from the input device to a host computing device.

Abstract: A pad for a computer input device includes a top surface over which the input device is slid and a bottom surface, opposite the top surface, for contacting a support surface. The bottom surface having a raised pivot portion allowing movement of the pad about the pivot portion.

Abstract: A system and method for freeing a pet from a portable holding cage. A portable holding cage is provided with a door that can be locked in a closed position by an electromechanical locking mechanism. The operation of the electromechanical locking mechanism is controlled by a systems controller. The systems controller monitors alarm signals transmitted to it from a remote smoke detector. The transmitted alarm signals can be audible alarm signals, radio alarm signals or optical alarm signals. Once the alarm signal is received and identified by the systems controller, the systems controller activates the electromechanical locking mechanism and opens the door to the holding cage.

Abstract: A lawn edging system and methods for edging a lawn are disclosed. The system includes a plurality of individual, integrally formed lawn edging units. Each unit includes a first portion and a substantially perpendicular second portion. The second portion includes a central section, having a length equal to the length of the first portion, and two end areas, which, when combined with the length of the central section, define a length greater than that of the first portion. The end areas are preferably rounded, but may be boxed, pointed, or scalloped. In use, an end area on one unit overlaps an end area of an adjacent unit while the first portions of the adjacent units abut. The second portion preferably includes an aperture for accepting a stake to anchor the unit into the ground. The aperture may be centrally located, or there may be a plurality of evenly spaced apertures. The design of the lawn edging device enables a plurality of lawn edging units to be nested compactly and packaged for sale or storage.