초록 ▼

The autofocus apparatus has a first mode of shifting a focus lens at a fine step interval so as to sample an AF evaluation value, and for detecting an in-focus position on the basis of a sampling AF evaluation value; and a second mode of shifting the focus lens at a coarse step interval so as to sam

The autofocus apparatus has a first mode of shifting a focus lens at a fine step interval so as to sample an AF evaluation value, and for detecting an in-focus position on the basis of a sampling AF evaluation value; and a second mode of shifting the focus lens at a coarse step interval so as to sample an AF evaluation value, and detecting a rough in-focus position on the basis of the sampling AF evaluation value, and subsequently, shifting the focus lens at a fine step interval so as to sample an AF evaluation value in the vicinity of the rough in-focus position, and detecting an in-focus position on the basis of the sampling AF evaluation value, and further, can select the first mode and the second mode.

대표청구항 ▼

1. An autofocus apparatus comprising:an image pickup device configured to convert a subject light via a lens system into an electric signal, and to output the electric signal as an image data; an A/D conversion unit configured to A/D-convert the image data into a digital image signal; an AF evaluati

1. An autofocus apparatus comprising:an image pickup device configured to convert a subject light via a lens system into an electric signal, and to output the electric signal as an image data; an A/D conversion unit configured to A/D-convert the image data into a digital image signal; an AF evaluation unit configured to output an AF evaluation value based on a high frequency component of a luminance signal of the digital image data; a sampling unit configured to sample the AF evaluation value obtained by said AF evaluation unit while shifting a focus lens position; a focus driving unit configured to detect an in-focus position based on the AF evaluation value sampling result obtained by said sampling unit; a first mode of shifting the focus lens at a fine step interval so as to sample an AF evaluation value, and to detect an in-focus position based on a sampling AF evaluation value; and a second mode of shifting the focus lens at a coarse step interval so as to sample an AF evaluation value, and to detect a rough in-focus position based on the sampling AF evaluation value, and subsequently, shifting the focus lens at a fine step interval so as to sample an AF evaluation value in the vicinity of the rough in-focus position, and to detect an in-focus position based on the sampling AF evaluation value, wherein the autofocus apparatus selects the first mode in areas other than a macro area and selects the second mode in the macro area.