Patent ID: 7554740

Claim:
An apparatus for use with a viewing optical system, the viewing optical system operable for viewing a scene, the apparatus comprising: an image injector, comprising a first optical element having a first side, a second optical element having a second side, and a reflective material, wherein the first side adjoins the second side and the reflective material is positioned between the first side and the second side; and an image generator optically coupled to the second element and operable to generate an image, wherein the image injector is adapted to be placed adjacent to an input of the viewing optical system and is operable to pass energy from the scene therethrough into the input of the viewing optical system, a portion of the energy from the scene passing through the first optical element into the input of the viewing optical system without passing through the first side of the first optical element, and the reflective material is operable to reflect energy from the image generated by the image generator into the viewing optical system.