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    • 2. 发明申请
    • AUTOFOCUS ASSIST LIGHTING USED FOR RANGEFINDING
    • 自动辅助照明用于测距
    • WO2010074735A1
    • 2010-07-01
    • PCT/US2009/006626
    • 2009-12-18
    • EASTMAN KODAK COMPANYSPENCE, John Patrick
    • SPENCE, John Patrick
    • G02B27/28G03B13/20G03B13/36G02B27/09G02B27/32
    • G01S17/46G01S17/88G02B27/40G03B13/20G03B15/02H04N5/23212H04N5/235
    • Autofocus (AF) assist lighting can be useful as a camera rangefinder in low light conditions. When ambient light conditions are inadequate for determining camera-to-subject distance using through-the-lens autofocus (TTL-AF) procedures, the AF assist light is used to attempt to raise the light level enough that the camera-to-subject distance can be determined using TTL-AF. If a camera-to-subject distance is not determined when the AF assist light is used, a camera-to-subject distance based on tabulated values is determined using an empirical model of AF assist luminance increment versus distance. If a camera-to-subject distance can be determined using TTL-AF when the AF assist light is used, but the lighting conditions are inadequate, the camera-to-subject distance used for capturing an image is a weighted combination of the TTL-AF camera-to-subject distance and a camera-to-subject distance based on a set of tabulated values determined using an empirical model of AF assist luminance increment versus distance.
    • 自动对焦(AF)辅助照明在低光照条件下可用作相机测距仪。 当环境光条件不足以使用透镜自动对焦(TTL-AF)程序确定相机对被摄体距离时,AF辅助光用于尝试提高足够的光线水平,以使相机对被摄体的距离 可以使用TTL-AF确定。 如果在使用AF辅助光的情况下未确定摄像对象距离,则使用AF辅助亮度增量与距离的经验模型来确定基于列表值的摄像对象距离。 如果使用AF辅助灯时可以使用TTL-AF确定摄像对象距离,但是照明条件不足,则用于拍摄图像的相机对被摄体的距离是TTL- 基于使用AF辅助亮度增量与距离的经验模型确定的一组列表值的AF摄像机到被摄体距离和摄像机到被摄体距离。