# US 2019/0320122 A1 · Control apparatus, image capturing apparatus, control method, and non-transitory computer-readable storage medium > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0320122 A1 - Document ID: US20190320122A1 - Status: Published application - Kind: A1 - Application number: 16/376,074 - Filed: 2019-04-05 - Published: 2019-10-17 - Earliest claimed: 2018-04-13 - Assignees: Canon Kabushiki Kaisha - Applicants: Canon Kabushiki Kaisha - Inventors: Reiji Hasegawa - Web page: https://patentgrep.com/patent/US20190320122A1 ## CPC - H04N 23/672: {based on the phase difference signals} - G02B 7/285: {including two or more different focus detection devices, e.g. both an active and a passive focus detecting device} - G02B 7/34: using different areas in a pupil plane - G02B 7/38: measured at different points on the optical axis {, e.g. focussing on two or more planes and comparing image data} - G06T 7/70: Determining position or orientation of objects or cameras (camera calibration G06T7/80) - H04N 23/61: based on recognised objects - H04N 23/675: {comprising setting of focusing regions} - H04N 25/62: Detection or reduction of noise due to excess charges produced by the exposure, e.g. smear, blooming, ghost image, crosstalk or leakage between pixels - H04N 25/704: Pixels specially adapted for focusing, e.g. phase difference pixel sets - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL ## Abstract A control apparatus includes a first focus detector (255, 212) which performs focus detection by phase difference detection using a first sensor (254) that receives a light ray formed by an image capturing optical system, a second focus detector (204, 212) which performs the focus detection using a second sensor (201) that receives a light ray formed by the image capturing optical system, a calculator (212a) which calculates correction information corresponding to a difference between first and second signals from the first and second detectors, a memory (209) which stores the correction information, a controller (212b) which performs focus control based on the first signal in a first area and performs the focus control based on the second signal and the correction information in a second area, and an identifier (212) which identifies an object, and the memory stores the correction information for each object. ## Claims ### Claim 1 A control apparatus comprising: a first focus detector configured to perform focus detection by phase difference detection using a first sensor that receives a light ray formed by an image capturing optical system; a second focus detector configured to perform focus detection by phase difference detection using a second sensor that receives a light ray formed by the image capturing optical system; a calculator configured to calculate correction information corresponding to a difference between a first signal from the first detector and a second signal from the second detector; a memory configured to store the correction information calculated by the calculator; a controller configured to perform focus control based on the first signal in a first area and perform the focus control based on the second signal and the correction information stored in the memory in a second area; and an identifier configured to identify an object, wherein the memory is configured to store the correction information for each object identified by the identifier. ### Claim 2 (depends on 1) The control apparatus according to claim 1, wherein the first area is a central area in a captured image, and the second area is a peripheral area surrounding the central area. ### Claim 3 (depends on 1) The control apparatus according to claim 1, wherein: the first sensor is an AF sensor capable of performing the focus detection in the first area, and the second sensor is an image sensor capable of performing the focus detection in each of the first area and the second area. ### Claim 4 (depends on 1) The control apparatus according to claim 1, wherein: when the object exists in the first area, the controller is configured to perform the focus control based on the first signal and store the correction information in the memory, and when the object exists in the second area, the controller is configured to perform the focus control based on the second signal and the correction information stored in the memory. ### Claim 5 (depends on 4) The control apparatus according to claim 4, further comprising a position detector configured to detect a position of the object, wherein the memory is configured to store the correction information for each position of the object detected by the position detector. ### Claim 6 (depends on 5) The control apparatus according to claim 5, wherein: when the object exists in the second area and the correction information corresponding to the position of the object is stored in the memory, the controller is configured to perform the focus control based on the correction information, and when the object exists in the second area and the correction information corresponding to the position of the object is not stored in the memory, the controller is configured to calculate correction information by an interpolation calculation using a plurality of pieces of correction information stored in the memory, and perform the focus control based on the correction information calculated by the interpolation calculation. ### Claim 7 (depends on 1) The control apparatus according to claim 1, wherein the calculator is configured to calculate the difference based on a difference of times at which the first sensor and the second sensor receive the light rays formed by the image capturing optical system. ### Claim 8 (depends on 1) The control apparatus according to claim 1, wherein the controller is configured to: perform the focus control with a first correction amount corresponding to the correction information in a first partial area of the second area, and perform the focus control with a second correction amount that is smaller than the first correction amount corresponding to the correction information in a second partial area of the second area, the second partial area being farther from the first area than the first partial area. ### Claim 9 (depends on 1) The control apparatus according to claim 1, wherein: when an elapsed time since the object is moved from the first area to the second area is a first elapsed time, the controller is configured to perform the focus control with a first correction amount corresponding to the correction information, and when the elapsed time is a second elapsed time that is longer than the first elapsed time, the controller is configured to perform the focus control with a second correction amount that is smaller than the first correction amount corresponding to the correction information. ### Claim 10 (depends on 1) The control apparatus according to claim 1, wherein: the first focus detector is configured to perform the focus detection by a correlation calculation shift in a first direction, the second focus detector is configured to perform the focus detection by the correlation calculation shift in a second direction, and the calculator is configured to calculate the difference obtained by the focus detection together with the first direction and the second direction. ### Claim 11 An image capturing apparatus comprising: a first sensor configured to receive a light ray formed by an image capturing optical system; a first focus detector configured to perform focus detection by phase difference detection using the first sensor; a second sensor configured to receive a light ray formed by the image capturing optical system; a second focus detector configured to perform focus detection by phase difference detection using the second sensor; a calculator configured to calculate correction information corresponding to a difference between a first signal from the first detector and a second signal from the second detector; a memory configured to store the correction information calculated by the calculator; a controller configured to perform focus control based on the first signal in a first area and perform the focus control based on the second signal and the correction information stored in the memory in a second area; and an identifier configured to identify an object, wherein the memory is configured to store the correction information for each object identified by the identifier. ### Claim 12 (depends on 11) The image capturing apparatus according to claim 11, further comprising: a half mirror configured to be retreatable from an optical path of the light ray formed by the image capturing optical system; and a finder configured to observe the light ray reflected by the half mirror, wherein the first sensor is configured to receive the light ray that is formed by the image capturing optical system and that transmits through the half mirror, and wherein the second sensor is configured to receive the light ray formed by the image capturing optical system while the half minor retreats from the optical path. ### Claim 13 A control method comprising the steps of: performing first focus detection by phase difference detection using a first sensor that receives a light ray formed by an image capturing optical system; performing second focus detection by phase difference detection using a second sensor that receives a light ray formed by the image capturing optical system; calculating correction information corresponding to a difference between a first signal obtained by the first detection and a second signal obtained by the second detection; storing the calculated correction information; performing focus control based on the first signal in a first area; performing the focus control based on the second signal and the stored correction information; and identifying an object, wherein the step of storing the correction information includes storing the correction information for each object identified by the identifier. ### Claim 14 A non-transitory computer-readable storage medium which stores a program causing a computer to execute a process comprising the steps of: performing first focus detection by phase difference detection using a first sensor that receives a light ray formed by an image capturing optical system; performing second focus detection by phase difference detection using a second sensor that receives a light ray formed by the image capturing optical system; calculating correction information corresponding to a difference between a first signal obtained by the first detection and a second signal obtained by the second detection; storing the calculated correction information; performing focus control based on the first signal in a first area; performing the focus control based on the second signal and the stored correction information; and identifying an object, wherein the step of storing the correction infolliiation includes storing the correction information for each object identified by the identifier.