公开(公告)号：US5544252A

公开(公告)日：1996-08-06

申请号：US939130

申请日：1992-09-02

申请人： Tadao Iwaki ,  Yasuyki Mitsuoka ,  Nobuyuki Kasama

发明人： Tadao Iwaki ,  Yasuyki Mitsuoka ,  Nobuyuki Kasama

IPC分类号： G02B7/28 ,  G01B11/00 ,  G01C3/06 ,  G02B7/36 ,  G06K9/74 ,  H04N5/232 ,  G06K9/64

CPC分类号： G06K9/748 ,  G02B7/36

摘要： A rangefinding/autofocusing apparatus utilizes a joint transform correlator of a Fourier correlation optical system. A pair of imaging lens systems form a pair of object input images. A lens driving mechanism drives the imaging lens systems in a parallel manner. The pair of object input images are recorded for display. A reference input image is displayed concurrently along with the recorded object input images in an offset relation relative to each other. A photodetector disposed on the correlation plane of the Fourier correlation optical system detects correlation peaks corresponding to a correlation coefficient of the pair of displayed object input images to measure an interval between the detected correlation peaks. The photodetector also detects correlation peaks corresponding to a correlation coefficient of the reference input image and the object input images to determine a correlation between the reference image and the object. A calculation unit calculates a distance between the object and the imaging lens systems to determine a just-focused state of the object depending on the measured interval. The lens driving mechanism shifts the imaging lens systems to thereby establish the just-focused state of the object. A target object is recognized depending on the correlation between the reference image and the object after the just-focused state is established.

摘要翻译： 测距/自动对焦设备利用傅立叶相关光学系统的联合变换相关器。 一对成像透镜系统形成一对物体输入图像。 透镜驱动机构以并行方式驱动摄像透镜系统。 记录一对物体输入图像以进行显示。 参考输入图像与记录的对象输入图像一起以偏移关系相对于彼此同时显示。 设置在傅立叶相关光学系统的相关平面上的光电检测器检测与所显示的对象输入图像对的相关系数相对应的相关峰值，以测量检测到的相关峰值之间的间隔。 光电检测器还检测与参考输入图像和对象输入图像的相关系数相对应的相关峰值，以确定参考图像和对象之间的相关性。 计算单元计算物体和成像镜头系统之间的距离，以根据测量的间隔确定物体的刚刚聚焦的状态。 透镜驱动机构移动成像透镜系统，从而建立对象的刚刚聚焦的状态。 取决于在建立刚刚聚焦状态之后的参考图像和对象之间的相关性来识别目标对象。