Patent ID: 7995909

Claim:
An auto-focusing method comprising: setting a central point of area of interest according to a user's input to select a moving object to perform auto tracking of the moving object within an image; setting an auto focusing area encompassing the central point of area of interest, the auto focusing area in which an operation is performed for auto focusing; setting a tracking sub-window encompassing the auto focusing area, the tracking sub-window in which an operation is performed for auto tracking; and tracking, by the central point of area of interest according to the user's input, the auto focusing area and the tracking sub-window, the moving object while changing a position of the auto focusing area and updating a position of the tracking sub-window according to a movement of the moving object, wherein an edge part of the tracking sub-window is maintained in alignment with an edge part of the image, and the auto focusing area alone inside the tracking sub-window moves toward the edge part of the image in order to track the moving object within the tacking sub-window when the moving object for auto tracking is being separated from the edge part of the image, and the auto focusing area and the tracking sub-window stay within the edge part of the image even when the moving object for auto tracking moves outside the edge part of the image and the auto focusing area alone moves within the tracking sub-window and reaches the edge part of the image.