| 摘要 |
A multispot autofocus system, usable with a camera, includes a radiation emitter (32) for emitting visible or infrared radiation. The radiation is divided into at least three discreet beams (36a,b,c) of radiation by one or more holographic and/or diffractive optical elements (42). The beams of radiation are directed to different areas (65,67) of a scene to be recorded. An amount of radiation reflected from the scene is measured. A correct focus position of an optical system of the camera is determined based on the amount of radiation reflected from the scene which is measured. <MATH> |
