Focus adjustment apparatus and focus adjustment method
First Claim
Patent Images
1. A focus adjustment apparatus comprising:
- a focus lens;
a focus lens driver configured to drive the focus lens in an optical axis direction;
an image pickup unit configured to generate an image signal by converting image light incident through the focus lens into an electrical signal;
a determiner configured to determine whether the brightness of the image signal is low by comparing brightness information of the image signal to reference brightness information;
a focus area setting unit configured to set a first focus area if the brightness of the image signal is not low and sets a second focus area, which is greater than the first focus area and has a shape of which a width of an upper part is narrower than a width of a lower part, if the brightness of the image signal is low; and
a controller configured to control movement of the focus lens to adjust a focus on an image signal corresponding to the set focus area.
1 Assignment
0 Petitions
Accused Products
Abstract
Focus adjustment apparatus and methods for effectively auto-focusing on a subject by adaptively changing a shape of a focus area according to a determined image condition, and in particular, setting the focus area in a shape of which a width of an upper part is narrow according to the condition.
-
Citations
13 Claims
-
1. A focus adjustment apparatus comprising:
-
a focus lens; a focus lens driver configured to drive the focus lens in an optical axis direction;
an image pickup unit configured to generate an image signal by converting image light incident through the focus lens into an electrical signal;a determiner configured to determine whether the brightness of the image signal is low by comparing brightness information of the image signal to reference brightness information; a focus area setting unit configured to set a first focus area if the brightness of the image signal is not low and sets a second focus area, which is greater than the first focus area and has a shape of which a width of an upper part is narrower than a width of a lower part, if the brightness of the image signal is low; and a controller configured to control movement of the focus lens to adjust a focus on an image signal corresponding to the set focus area. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A focus adjustment method comprising:
-
generating an image signal by converting image light incident through a focus lens into an electrical signal; determining whether brightness of the image signal is low by comparing brightness information of the image signal to reference brightness information; setting, using a focus area setting unit, a first focus area if the brightness of the image signal is not low, and if the brightness of the image signal is low, setting a second focus area which is greater than the first focus area and has a shape of which a width of an upper part is narrower than a width of a lower part; and moving the focus lens to adjust a focus on an image signal corresponding to the set focus area. - View Dependent Claims (8, 9, 10, 11, 12)
-
-
13. A non-transitory computer readable storage medium storing computer readable instructions which, when read by an automated focus adjustment apparatus, cause the focus adjustment apparatus to perform a method comprising:
-
generating an image signal by converting image light incident through a focus lens into an electrical signal; determining whether brightness of the image signal is low by comparing brightness information of the image signal to reference brightness information; setting a first focus area if the brightness of the image signal is not low, and if the brightness of the image signal is low, setting a second focus area which is greater than the first focus area and has a shape of which a width of an upper part is narrower than a width of a lower part; and moving the focus lens to adjust a focus on an image signal corresponding to the set focus area.
-
Specification