| 摘要 |
An autofocus system is provided whereby an automatic tracking function focusing on a target subject by autofocus (AF) while tracking the target subject on a screen detects by pattern matching processing an image most matching a reference pattern image stored as a target subject image among captured images and, only when a correlation value for the image and reference pattern image equals or exceeds a predetermined threshold value, moves the AF focus position to the detected image position. The system can prevent erroneous detection of target subjects in accordance with imaging situations by enabling changes to the threshold value. A tracking device 16 in a television camera or the like stores an image of a target subject for tracking as a reference pattern image and detects by pattern matching an image most matching that reference pattern image among captured images of newly-incorporated frames to detect the target subject position.
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