JP2010078810A5

JP2010078810A5 -

Info

Publication number: JP2010078810A5
Application number: JP2008245986A
Authority: JP
Filing date: 2008-09-25
Publication date: 2011-11-17
Anticipated expiration: 2028-09-25

Claims

Based on an image obtained by photoelectrically converting light incident through a photographing optical system including a focus lens with an image sensor, the focus evaluation value indicating the focus state of the subject in the distance measurement area of the image is maximum. Focus adjusting means for controlling the position of the focus lens so that
Setting means for setting a plurality of determination regions in an image photographed by the image sensor;
For each of the set determination area, an acquisition unit configured to acquire a contrast value of each of the images obtained at the location of a plurality of said focus lens,
Determination means for determining whether or not the determination area is to be the distance measurement area based on the contrast value acquired at the positions of the plurality of focus lenses;
The automatic focusing device, wherein the focus adjustment unit controls the position of the focus lens based on a focus evaluation value acquired in the determination area determined to be the distance measurement area by the determination unit.

The determination unit calculates a total value by adding the contrast values acquired at the positions of the plurality of focus lenses for each of the set determination regions, and the calculated total value is equal to or greater than a predetermined value. The automatic focusing apparatus according to claim 1, wherein the determination area is determined to be the distance measurement area.

When the number of discriminating areas in a group constituted by adjacent discriminating areas among the discriminating areas in which the calculated total value is equal to or greater than the predetermined value is greater than or equal to a predetermined number, The automatic focusing apparatus according to claim 2, wherein the determination area is determined to be the distance measurement area.

3. The automatic focusing according to claim 2, wherein the determination unit determines the predetermined value to be compared with the total value using the contrast values acquired at the positions of the plurality of focus lenses. 4. apparatus.

Storage means for storing a plurality of contrast values acquired at the positions of the plurality of focus lenses;
5. The automatic focusing device according to claim 1, wherein the focus adjusting unit calculates the focus evaluation value using the stored contrast value. 6.

The focus adjustment unit normalizes the focus evaluation value by using the number of areas determined to be the distance measurement area by the determination unit. Automatic focusing device.

Based on an image obtained by photoelectrically converting light incident through a photographing optical system including a focus lens with an image sensor, the focus evaluation value indicating the focus state of the subject in the distance measurement area of the image is maximum. Focus adjusting means for controlling the position of the focus lens so that
Setting means for setting a plurality of determination regions in an image photographed by the image sensor;
For each of the set determination area, an acquisition means for acquiring a luminance value of each of the images obtained at the location of a plurality of said focus lens,
Determining means for determining whether or not to set the determination area as the distance measurement area based on the luminance values acquired at the positions of the plurality of focus lenses;
It said focusing means, based on the focus evaluation value obtained by the determination area determined to be the distance measuring area by the determining means, an automatic focusing apparatus characterized by controlling the position of the focus lens.

Based on an image obtained by photoelectrically converting light incident through a photographing optical system including a focus lens with an image sensor, the focus evaluation value indicating the focus state of the subject in the distance measurement area of the image is maximum. A focus adjustment method for controlling the position of the focus lens so that
A setting step for setting a plurality of discrimination regions in an image photographed by the image sensor;
For each of the set discrimination regions, an acquisition step of acquiring a contrast value of each of the images obtained at a plurality of focus lens positions;
A determination step of determining whether or not the determination area is to be the distance measurement area based on the contrast value acquired at the positions of the plurality of focus lenses;
And a control step of controlling the position of the focus lens based on a focus evaluation value acquired in the determination area determined to be the distance measurement area in the determination step .

Based on an image obtained by photoelectrically converting light incident through a photographing optical system including a focus lens with an image sensor, the focus evaluation value indicating the focus state of the subject in the distance measurement area of the image is maximum. A focus adjustment method for controlling the position of the focus lens so that
A setting step for setting a plurality of discrimination regions in an image photographed by the image sensor;
An acquisition step of acquiring the brightness value of each of the images obtained at a plurality of positions of the focus lens for each of the set discrimination regions;
A determination step of determining whether or not to set the determination area as the distance measurement area based on the luminance values acquired at the positions of the plurality of focus lenses;
And a control step of controlling the position of the focus lens based on a focus evaluation value acquired in the determination area determined to be the distance measurement area in the determination step .