초록 ▼

A method and apparatus for extracting information from an object within a large interrogation zone by utilizing a retroreflective backing to define the location of the object and/or information on the object, and an apparatus designed to eliminate from consideration all specularly and diffusely refl

A method and apparatus for extracting information from an object within a large interrogation zone by utilizing a retroreflective backing to define the location of the object and/or information on the object, and an apparatus designed to eliminate from consideration all specularly and diffusely reflected light otherwise present within the zone and thereby isolate the retroreflective backing within the zone. The apparatus then extracts the information which was defined by the retroreflective backing.

대표청구항 ▼

A method of sensing and identifying of information having an unknown position and orientation within a large interrogation zone, said method comprising: incorporating the information which is to be read on a retroreflective material designed to reflect incident electromagnetic radiation in a concent

A method of sensing and identifying of information having an unknown position and orientation within a large interrogation zone, said method comprising: incorporating the information which is to be read on a retroreflective material designed to reflect incident electromagnetic radiation in a concentrated cone surrounding the axes of incidence; irradiating the zone with electromagnetic radiation by a source having a predetermined location with respect to the zone, thereby establishing a known axis of incidence for the radiation from the source; sensing the zone for electromagnetic radiation which is reflected off of objects within the zone; locating the sensing means adjacent the known axis of incidence from the irradiation source, thus receiving radiation originating from the irradiation source and reflected by the retroreflective material, but tending to eliminate radiation from radiation sources which is specularly reflected by areas within the zone; selecting sensed radiation that has a magnitude greater than a predetermined value which is typical for diffuse reflection; and identifying information contained within the selected radiation.