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AUTO FOCUS ADJUSTING METHOD, AUTO FOCUS ADJUSTING APPARATUS, AND DIGITAL PHOTOGRAPHING APPARATUS INCLUDING THE SAME

  • US 20130033638A1
  • Filed: 08/03/2012
  • Published: 02/07/2013
  • Est. Priority Date: 08/05/2011
  • Status: Active Grant
First Claim
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1. An auto focus (AF) adjusting apparatus comprising:

  • an image pickup lens in which the 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 peak detector for detecting the peak position of the focus detection evaluation values;

    a shutter for controlling light exposure of the image pickup device; and

    a speed calculator for calculating the moving speed of a subject by using the peak position,wherein, when continuous photographing for continuously capturing 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 the moving speed calculated in the light exposure preparation interval before capturing starts.

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