IMAGING APPARATUS AND IMAGING METHOD

摘要

An imaging apparatus including an image sensor, an evaluation value calculation unit, and an in-focus position calculation unit. The image sensor performs photoelectric conversion on a subject image formed by an image optical system including a focus adjustment unit. The evaluation value calculation unit calculates a first focus evaluation value and a second focus evaluation value with spatial frequency components of first and second frequency bands extracted from image signals output from the image sensor. The second frequency band includes a spatial frequency component higher than the spatial frequency component of the first frequency band.;The in-focus position calculation unit defines a position at which a third focus evaluation value reaches its peak value as an in-focus position of the focus adjustment unit. The third focus evaluation value is obtained by calculating a ratio of the first and the second focus evaluation values.

主权项

1. An imaging apparatus, comprising:
an image sensor configured to perform photoelectric conversion on a subject image formed by an image optical system including a focus adjustment unit; an evaluation value calculation unit configured to calculate a first focus evaluation value and a second focus evaluation value, the first focus evaluation value being calculated with a spatial frequency component of a first high frequency band extracted from an image signal output from the image sensor, the second focus evaluation value being calculated with a spatial frequency component of a second high frequency band extracted from an image signal output from the image sensor, the second high frequency band including a spatial frequency component higher than the spatial frequency component of the first high frequency band; and an in-focus position calculation unit configured to define a position at which a third focus evaluation value reaches a peak value as an in-focus position of the focus adjustment unit, the third focus evaluation value being obtained by calculating a ratio of the first focus evaluation value and the second focus evaluation value.