Auto focus adjusting method, auto focus adjusting apparatus, and digital photographing apparatus including the same

摘要

An auto focus (AF) adjusting method, an AF adjusting apparatus, and a digital photographing apparatus including the same, the AF adjusting apparatus including: an AF calculator for calculating focus detection evaluation values; a peak detector for detecting a peak position of the focus detection evaluation values; and a speed calculator for calculating a moving speed of a subject by using the peak position. When continuous photographing of still images is performed, the peak detector detects the peak position in an image pickup interval before a light exposure preparation interval for image capturing, and the focus lens driver performs moving body compensation driving for compensating for a focal position by using a moving speed calculated in the light exposure preparation interval before capturing starts.

主权项

1. An auto focus (AF) adjusting apparatus comprising:
an image pickup lens in which a position of a focus lens is variable for focus adjustment; a focus lens driver for driving the focus lens; an image pickup device for generating an image signal by picking up light which has passed through the image pickup lens; an AF calculator for calculating focus detection evaluation values from the image signal; a focal position detector for detecting a focal position of the focus detection evaluation values; a shutter for controlling light exposure of the image pickup device; and a speed calculator for calculating a moving speed of a subject by using detecting a change in the focal position over a period of time, wherein, when continuous photographing for continuously capturing still images is performed: after the previous still image capturing, the focal position detector detects the focal position in an image pickup interval before a light exposure preparation interval for a subsequent still image capturing; and the focus lens driver performs moving body compensation driving for compensating for the focal position by using the moving speed calculated in the light exposure preparation interval before the subsequent still image capturing starts.