| 摘要 |
PCT No. PCT/US92/10265 Sec. 371 Date Feb. 23, 1995 Sec. 102(e) Date Feb. 23, 1995 PCT Filed Nov. 25, 1992 PCT Pub. No. WO93/16411 PCT Pub. Date Aug. 19, 1993The invention includes a method used with a camera that is aimed toward a field of view by a light beam that produces a light pattern indentifying at least a part of the field of view. The method photographs the field of view without photographing the light pattern produced by the light beam. The method includes the steps of receiving light, producing signals representative of the received light, intermittently reading the signals to create a video photograph, where the intermittent reading results in intermissions between readings, recognizing the intermission and causing the light beam to produce the light pattern during intermissions only. The beam produces a light pattern on an object within or near the camera's field of view, thereby identifying at least a part of the field of view. The radiant energy source is often a laser and the radiant energy beam is often a laser beam. A detection mechanism detects the intermissions and produces a signal that causes the radiant energy source to project the radiant energy beam. The detection mechanism is typically an electrical circuit including a retriggerable multivibrator or other functionally similar component. In several other embodiments, a radiant energy source produces a constant beam of radiant energy. In one embodiment, a filtering mechanism detects and filters the radiant energy beam before it impinges on a sensor within the camera. In another embodiment, a filtering mechanism detects and filters the energy beam after it impinges on the camera's sensor, but before the camera produces a visual image of the field of view. In another embodiment using a pulsed beam, a modulation signature of the energy beam is decoded and suppressed before reaching the visual image created by the camera.
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