| 摘要 |
Automatic tracking of a target image is made comparatively easy. Specifically, an image obtained by imaging a subject is displayed on a display screen and a tracking frame is displayed at a reference position located at the central portion of the display screen. A target area for setting the initial position of the tracking frame is set surrounding the tracking frame and a high-frequency-component image representing high-frequency components of the image within this area is generated. The amount of high-frequency component is calculated while a moving frame is moved within the high-frequency-component image. The position of the moving frame where the calculated amount of high-frequency component is largest is decided upon as the initial position of the tracking frame.
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