| 摘要 |
An autofocus system comprising: an imaging device which images a subject image that was formed by an optical system; a matching image detection device which detects an image that most matches a reference pattern image that was previously stored as an image of a target subject to focus on among captured images that were imaged by the imaging device; a determining device that determines that an image of the target subject was detected among the captured images when a correlation value which indicates a degree of matching of an image detected by the matching image detection device with respect to the reference pattern image is equal to or greater than a predetermined threshold value and determines that an image of the target subject was not detected among the captured images when the correlation value is less than the threshold value; a changing device which changes the threshold value in the determining device; and an autofocus device which, only in a case where the determining device determined that an image of the target subject was detected, takes a position, on the screen showing captured images, of an image that was detected by the matching image detection device as a position of the target subject to focus on and performs focus adjustment of the optical system such that a target subject in the position is in focus.
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