| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve focus detection accuracy for a low brightness object at any distance measurement position without increasing a distance measurement time, regardless of an aperture value and the kind of a lens of a photographic lens. <P>SOLUTION: An imaging apparatus comprises: an imaging element in which imaging pixels receiving a flux of light passing through an exit pupil of a photographic lens and focus detection pixels receiving fluxes of the light passing through partial areas of the exit pupil of the photographic lens are arranged; a focus detection section that detects a defocus amount of the photographic lens by a phase difference method using output signals of the focus detection pixels; an acquisition section that acquires aperture information of the photographic lens; a threshold setting section that sets a prescribed threshold on the basis of the acquired aperture information and positions of the focus detection pixels; a reading section that reads pixel signals from the imaging element with a predetermined period; an addition section that adds the pixel signals of the focus detection pixels read from the imaging element with the predetermined period; a comparison section that compares the added addition signal with the prescribed threshold; and a control section that ends the adding process when the comparison determines that the level of the addition signal exceeds the prescribed threshold. The imaging apparatus detects the defocus amount of the photographic lens using the addition signal for which the adding process has ended. <P>COPYRIGHT: (C)2013,JPO&INPIT |
