Abstract: A reflector can have a conical shape. The shape can tapers from a wide base to an apex. The apex can include an aperture, a mirror, and a set of one or more optical elements. A mirror is location in a cavity and is positioned within an overhang enclosure of the device in a plane approximately parallel to a circular cross section of the conical shape. The mirror can reflect environmental light that is reflected by the reflector into the aperture or reflect light emitting from the aperture onto the reflector. Stray light reflected by the mirror is absorbed by the cavity walls. A set of one or more optical elements can be positioned at least partially within a volumetric region of the reflector. The one or more optical elements focus light passing through the aperture to an image sensor.

Abstract: A calibration method can begin by positioning a calibration image source around and substantially proximate to the exterior surface of a panoramic optical device that utilizes a conical quadric reflector having an aperture in its apex. The calibration image source can be made of a material that is substantially transparent to allow the passage of environmental light and can utilize a predetermined color palette having a calibration feature, such as a geometric shape and/or a line, which is in a known location. A quadric image of the calibration image source can then be captured. Coordinates for a visual image center of the calibration image can be determined by an image center calibration program using the location of the calibration feature. The visual image center can be the point around which a quadric image is transformed into a visually-correct panorama. The determined visual image center coordinates can be stored.

Abstract: A system (20) of targeted broadcasting in a cellular communication system during an event can include at least one mobile unit (25) having stored therein scheduling information relating to an event, a designated location for the event, and a designated group channel for monitoring such event. The mobile unit can further be programmed to monitor (67) for the event in a designated location and on a designated group channel during a predetermined time window and receive (71) a targeted message during the event on the designated group channel if a current location of the mobile unit matches the designated location stored. The mobile unit can be programmed to transmit at least one group call message response in response to receiving the group call message only when the mobile unit is in the designated location. The system can further include fixed network equipment (26) that transmits data related to the event.