Image analysis – Image transformation or preprocessing – Fourier transform
Patent
1992-09-02
1996-08-06
Mancuso, Joseph
Image analysis
Image transformation or preprocessing
Fourier transform
354402, 359561, G06K 964
Patent
active
055442528
ABSTRACT:
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.
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Iwaki Tadao
Kasama Nobuyuki
Mitsuoka Yasuyki
Adams Bruce L.
Mancuso Joseph
Seiko Instruments Inc.
Wilks Van C.
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