Patent ID: 7929727

Claim:
A method for detecting an object from its background or surroundings comprising the steps of: viewing an area with a viewing device comprising a first filter and a second filter, while with the first filter selectively and varyingly changing the sensitivity of the viewing device to certain wavelengths of light (electromagnetic radiation) lying in the ultraviolet (UV) range such that the first filter passes visible light plus a variable bandpass of UV light, and with the second filter selectively and varyingly changing the sensitivity of the viewing device to certain wavelengths of light (electromagnetic radiation) lying in the infrared (IR) range such that the second filter passes visible light plus a variable bandpass of IR light; and determining the presence of an object when a visual difference between the object and background is discerned when the sensitivity of the viewing device is changed to pass a certain mixture of input of UV, IR and visible light, wherein the visual difference between the object and background is a difference in color or tonality.