Image capturing apparatus and control method therefor
AssigneeCanon Kabushiki Kaisha
InventorHitoshi Yasuda
Life of this patent
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Abstract
In an image capturing apparatus that carries out TV-AF type autofocus control by setting an AF frame on a predetermined object, for example a person's face, that is detected in an image, in a case in which a in-focus position search direction cannot be determined from an AF evaluation value, changes in the size of the region of the object are detected and focus detection is carried out by determining the in-focus position search direction based on the changes in the size of the region of the object.
Claims4
An image capturing apparatus that carries out autofocus control by driving a focus lens, comprising:
- a detection unit which detects a region of a particular object from a captured image;
- a setting unit which sets a focus detection area based on detection results obtained by the detection unit;
- a generating unit which generates an AF evaluation value based on a component of a predetermined frequency band contained in the focus detection area of a captured image;
- a determination unit which determines an in-focus position search direction based on a change in a size of the region of the particular object detected by the detection unit;
- and
- a control unit which determines an in-focus position based on a plurality of AF evaluation values obtained at different positions of the focus lens by driving the focus lens to the different positions based on the in-focus position search direction determined by the determination unit if it is determined that an AF evaluation value is less than a predetermined threshold.
A control method for an image capturing apparatus that carries out autofocus control by driving a focus lens, comprising:
- a detection step of detecting a region of a particular object from a captured image;
- a setting step of setting a focus detection area based on detection results obtained in the detecting step;
- a generating step of generating an AF evaluation value based on a component of a predetermined frequency band contained in the focus detection area of a captured image;
- a determination step of determining an in-focus position search direction based on a change in a size of the region of the particular object detected in the detecting step;
- and
- a control step of determining an in-focus position based on a plurality of AF evaluation values obtained at different positions of the focus lens by driving the focus lens to the different positions based on the in-focus position search direction determined in the determination step if it is determined that an AF evaluation value is less than a predetermined threshold.
Dependencies are inferred from the claim text.