JP2016018116A5 - - Google Patents

Claims (15)

An acquisition means for acquiring an image signal obtained by imaging an object image formed by an imaging optical system including a focus lens by an imaging means;
First focus detection means for generating a first drive information of the focus lens by detecting a focus state of the subject image in a first direction of an imaging surface of the imaging means using the image signal;
Using a plurality of image signals corresponding to the subject images in the defocused state having different defocus amounts, evaluation values of the defocused state having a correlation with the position of the focus lens are obtained for a plurality of directions including the first direction. Second focus detection means for generating and generating second drive information of the focus lens based on the evaluation value;
Focus adjusting means for controlling the driving of the focus lens using either the first driving information or the second driving information according to the evaluation value;
A focus adjusting apparatus comprising:   The focus adjusting unit controls the driving of the focus lens using the second driving information when the evaluation value is within a predetermined range, and when the evaluation value is not within the predetermined range, the first driving is performed. The focus adjustment apparatus according to claim 1, wherein information is used to control driving of the focus lens.   The focus adjustment unit determines whether the evaluation value is within a predetermined range based on power in the plurality of directions of the image signal used by the second focus detection unit, and the power is 2. The sum of squares of image signals with respect to a direction, and the focus adjustment unit determines that the evaluation value is within a predetermined range when at least the power is equal to or greater than a predetermined threshold. 2. The focus adjustment apparatus according to 2.   4. The focus according to claim 3, wherein the second focus detection unit generates the evaluation value based on power of the image signal corresponding to the subject image in a blurred state having a different defocus amount. Adjusting device.   The second focus detection unit includes a determination unit configured to determine whether or not a difference between defocus amounts of a plurality of image signals corresponding to the subject images in a blurred state having different defocus amounts is greater than a predetermined threshold value. 5. The focus adjustment device according to claim 1, wherein the focus adjustment device controls generation of the evaluation value and generation of the second drive information according to a result of the determination. 6.   The second focus detection unit includes a conversion unit that converts the evaluation value into a defocus amount corresponding to the position of the focus lens that is correlated with the evaluation value. The second focus detection unit converts the evaluation value into the defocus amount converted by the conversion unit. The focus adjustment apparatus according to claim 1, wherein the second driving information is generated based on the first driving information.   A setting unit that sets an evaluation range for extracting an image signal used by each of the first focus detection unit and the second focus detection unit is provided, and the setting unit sets at least one of the evaluation ranges. The focus adjusting apparatus according to any one of claims 1 to 6. In the control method of the focus adjustment device,
An acquisition step of acquiring an image signal obtained by imaging a subject image formed by an imaging optical system including a focus lens by an imaging unit;
A first focus detection step of generating a first drive information of the focus lens by detecting a focus state in the first direction of the imaging surface of the imaging means using the image signal;
Using a plurality of image signals corresponding to the subject images in the defocused state having different defocus amounts, evaluation values of the defocused state having a correlation with the position of the focus lens are obtained for a plurality of directions including the first direction. A second focus detection step for generating and generating second drive information of the focus lens based on the evaluation value;
A focus adjustment step of controlling driving of the focus lens using either the first drive information or the second drive information according to the evaluation value;
A control method comprising:   A program for causing a computer to execute the control method according to claim 8.   A computer-readable storage medium storing a program for causing a computer to execute the control method according to claim 8. Imaging means for capturing an image of a subject formed by a photographing optical system including a focus lens capable of moving back and forth in the optical axis direction, and generating an image signal;
An acquisition means for acquiring an image signal obtained by imaging the subject images in different blur states formed by the imaging optical system with the imaging means;
First focus detection means for generating a first drive information of the focus lens by detecting a focus state in the first direction of the imaging surface of the imaging means using the image signal;
Using a plurality of image signals corresponding to the subject images in the defocused state having different defocus amounts, evaluation values of the defocused state having a correlation with the position of the focus lens are obtained for a plurality of directions including the first direction. Second focus detection means for generating and generating second drive information of the focus lens based on the evaluation value;
In accordance with the evaluation value, using one of the first drive information and the second drive information, and the focus adjusting means for controlling the driving means for driving the focus lens,
Imaging apparatus characterized by obtaining Bei a.   A plurality of image signals corresponding to the subject images in a blurred state having different defocus amounts, the imaging optical system in which the imaging parameters are changed by the changing unit; The image signal obtained by imaging the subject image formed by the imaging unit with the imaging unit, wherein the imaging parameters include at least a position of the focus lens, an aperture amount, and a focal length. The imaging device described. Instructing means for instructing exposure to cause the imaging means to take an image of the subject image, the focus adjusting means determines whether or not the exposure is instructed by the instructing means, and according to the result of the determination the imaging apparatus according to claim 11 or 12, characterized in that for controlling the pre-listen motion means. Control prior to hear motion means by said focusing means when said exposure is determined not to be instructed by the instructing means includes a control to perform the image pickup of the subject image on the imaging means, the second a control of the pre-listen motion means using the driving information, control of the pre-listen motion means by said focusing means when it is determined that the exposure has been instructed by said instructing means, the according to the evaluation value the imaging apparatus according to claim 13, characterized in that it comprises a control of the hear motion means before using any of the first drive information and the second drive information.   The imaging means includes imaging pixels for generating an image of the subject image, and focus detection pixels in which a plurality of photoelectric conversion means constitute pixels corresponding to the imaging pixels, and the first focus detection The imaging apparatus according to claim 11, wherein the unit detects the focus state using an image signal from the focus detection pixel.