Image pick-up apparatus and tracking method therefor

A tracking method for an image pick-up apparatus that generates captured images in series, said method comprising:

• a specifying step of the image pick-up apparatus specifying a subject included in the captured image;
• a tracking step of the image pick-up apparatus tracking the specified subject by extracting a region of the specified subject in the presently generated captured image having high correlation with a region of the specified subject in the precedently generated captured image;
• a display step of the image pick-up apparatus displaying the captured image on a screen and display identification information showing that the specified subject is tracked;
• and
• a setting step of the image pick-up apparatus setting a holding time in which the display of the identification information is held according to a sensitivity of an image sensor of the image pick-up apparatus,
• wherein said display step continues to display the identification information when the holding time does not lapse after said tracking step lost the subject, and eliminates a display of the identification information when the holding time has passed after the subject has been lost in said tracking step, and
• wherein said setting step sets the holding time shorter as the sensitivity of the image sensor is set higher.