# US 10,771,700 B2 · Image blur correction apparatus, interchangeable lens, camera body, image blur correction method, and storage medium > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,771,700 B2 - Document ID: US10771700B2 - Status: Granted - Kind: B2 - Application number: 16/240,977 - Filed: 2019-01-07 - Published: 2019-07-18 - Granted: 2020-09-08 - Earliest claimed: 2018-01-15 - Assignees: Canon Kabushiki Kaisha - Applicants: Canon Kabushiki Kaisha - Inventors: Takeshi Watanabe; Masafumi Kimura - Web page: https://patentgrep.com/patent/US10771700B2 ## CPC - H04N 23/683: {performed by a processor, e.g. controlling the readout of an image memory} - G02B 27/646: {compensating for small deviations, e.g. due to vibration or shake (movement of one or more optical elements for control of motion blur in cameras, projectors or printers G03B2205/0007; image stabilisation in cameras peculiar to the presence or use of an electronic image sensor H04N23/68)} - H04N 5/38: Transmitter circuitry {for the transmission of television signals according to analogue transmission standards} (H04N5/14 takes precedence) - H04N 23/55: Optical parts specially adapted for electronic image sensors; Mounting thereof - H04N 23/663: for controlling interchangeable camera parts based on electronic image sensor signals - H04N 23/6812: {based on additional sensors, e.g. acceleration sensors} - H04N 23/687: {by shifting the lens or sensor position} - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract There is provided an image blur correction apparatus. A detection unit detects shake occurring in an image capturing apparatus. Based on the shake, a determination unit determines a first correction amount and a second correction amount that are for correcting image blur. A transmission unit transmits a second correction amount to a second image blur correction apparatus via a communication device, the second image blur correction apparatus controlling a second correction member based on the second correction amount. An acquisition unit acquires a correction error of the second correction member caused by a communication delay of the second correction amount in the communication device. Based on the first correction amount and the correction error, a control unit controls a first correction member configured to correct image blur of the image capturing apparatus so as to reduce the correction error. ## Claims ### Claim 1 An image blur correction apparatus including a communication device configured to communicate with a second image blur correction apparatus that controls a second correction member configured to correct image blur of an image capturing apparatus, the image blur correction apparatus comprising one or more processors and a memory storing a program which, when executed by the one or more processors, causes the image blur correction apparatus to function as: a detection unit configured to detect shake occurring in the image capturing apparatus; a determination unit configured to, based on the shake, determine a first correction amount that is for correcting the image blur; a transmission unit configured to transmit the first correction amount to the second image blur correction apparatus via the communication device, the second image blur correction apparatus controlling the second correction member based on the first correction amount; an acquisition unit configured to acquire a correction error caused by a communication delay of the first correction amount in the communication device; and a control unit configured to control a first correction member configured to correct image blur of the image capturing apparatus so as to reduce the correction error, wherein the acquisition unit acquires the correction error based on a difference between the first correction amount currently determined by the determination unit and a fourth correction amount corresponding to the first correction amount previously determined by the determination unit and transmitted by the transmission unit. ### Claim 2 (depends on 1) The image blur correction apparatus according to claim 1, wherein the acquisition unit acquires the correction error, by subtracting a correction amount obtained by delaying the first correction amount in accordance with the communication delay from the first correction amount. ### Claim 3 (depends on 1) The image blur correction apparatus according to claim 1, wherein the determination unit is further configured to, based on the shake, determine a second correction amount that is for correcting the image blur, and wherein the control unit controls the first correction member based on the second correction amount and the correction error. ### Claim 4 (depends on 3) The image blur correction apparatus according to claim 3, wherein the control unit controls the first correction member based on a correction amount obtained by subtracting the correction error from the second correction amount. ### Claim 5 (depends on 3) The image blur correction apparatus according to claim 3, wherein the second image blur correction apparatus includes a receiving buffer configured to hold the first correction amount until the communication delay of the received first correction amount reaches a predetermined delay amount, and the acquisition unit, based on the predetermined delay amount, acquires, as the correction error of the second correction member, a correction error caused by the communication delay of the first correction amount and a holding time period of the first correction amount by the receiving buffer. ### Claim 6 (depends on 5) The image blur correction apparatus according to claim 5, wherein acquisition of the predetermined delay amount is performed prior to operation of the image blur correction apparatus. ### Claim 7 (depends on 5) The image blur correction apparatus according to claim 5, wherein the predetermined delay amount is changed depending on a mode of the image capturing apparatus. ### Claim 8 (depends on 3) The image blur correction apparatus according to claim 3, wherein the determination unit determines the first correction amount and the second correction amount by dividing a correction amount corresponding to the shake by a predetermined ratio into the first correction amount and the second correction amount. ### Claim 9 (depends on 3) The image blur correction apparatus according to claim 3, wherein the determination unit determines a high frequency component and a low frequency component of a correction amount corresponding to the shake respectively as the second correction amount and the first correction amount. ### Claim 10 (depends on 1) The image blur correction apparatus according to claim 1, wherein the second image blur correction apparatus controls the second correction member based on a third correction amount obtained by subtracting the first correction amount from a second correction amount for correcting the image blur that is determined based on shake occurring in the image capturing apparatus detected by a second detection unit; and wherein the control unit is configured to, based on the first correction amount and the correction error, control the first correction member so as to reduce the correction error. ### Claim 11 (depends on 10) The image blur correction apparatus according to claim 10, wherein the acquisition unit acquires the correction error, by subtracting the first correction amount from a correction amount obtained by delaying the first correction amount in accordance with the communication delay. ### Claim 12 (depends on 10) The image blur correction apparatus according to claim 10, wherein the control unit controls the first correction member based on a correction amount obtained by subtracting the correction error from the first correction amount. ### Claim 13 (depends on 10) The image blur correction apparatus according to claim 10, wherein the second image blur correction apparatus includes a receiving buffer configured to hold the first correction amount until the communication delay of the received first correction amount reaches a predetermined delay amount, and the acquisition unit, based on the predetermined delay amount, acquires, as the correction error of the second correction member, a correction error caused by the communication delay of the first correction amount and a holding time period of the first correction amount by the receiving buffer. ### Claim 14 (depends on 13) The image blur correction apparatus according to claim 13, wherein acquisition of the predetermined delay amount is performed prior to operation of the image blur correction apparatus. ### Claim 15 (depends on 13) The image blur correction apparatus according to claim 13, wherein the predetermined delay amount is changed depending on a mode of the image capturing apparatus. ### Claim 16 (depends on 10) The image blur correction apparatus according to claim 10, wherein one of the first correction member and the second correction member includes a lens movable in a direction perpendicular to an optical axis of the image capturing apparatus, and the other of the first correction member and the second correction member includes an image sensor movable in the direction perpendicular to the optical axis of the image capturing apparatus. ### Claim 17 (depends on 10) An interchangeable lens comprising: the image blur correction apparatus according to claim 10; and the first correction member. ### Claim 18 (depends on 10) A camera body comprising: the image blur correction apparatus according to claim 10; and the first correction member. ### Claim 19 (depends on 1) The image blur correction apparatus according to claim 1, wherein one of the first correction member and the second correction member includes a lens movable in a direction perpendicular to an optical axis of the image capturing apparatus, and the other of the first correction member and the second correction member includes an image sensor movable in the direction perpendicular to the optical axis of the image capturing apparatus. ### Claim 20 (depends on 1) An interchangeable lens comprising: the image blur correction apparatus according to claim 1; and the first correction member. ### Claim 21 (depends on 1) A camera body comprising: the image blur correction apparatus according to claim 1; and the first correction member. ### Claim 22 (depends on 1) The image blur correction apparatus according to claim 1, wherein a time at which the first correction amount corresponding to the fourth correction amount was determined by the determination unit precedes a time at which the first correction amount is currently determined by the determination unit by the communication delay. ### Claim 23 An image blur correction method executed by an image blur correction apparatus including a communication device configured to communicate with a second image blur correction apparatus that controls a second correction member configured to correct image blur of an image capturing apparatus, the image blur correction method comprising: detecting shake occurring in the image capturing apparatus; based on the shake, determining a first correction amount that is for correcting the image blur; transmitting the first correction amount to the second image blur correction apparatus via the communication device, the second image blur correction apparatus controlling the second correction member based on the first correction amount; acquiring a correction error caused by a communication delay of the first correction amount in the communication device; and controlling a first correction member configured to correct image blur of the image capturing apparatus so as to reduce the correction error, wherein in the acquiring, the correction error is acquired based on a difference between the first correction amount currently determined by the determination unit and a fourth correction amount corresponding to the first correction amount previously determined and transmitted. ### Claim 24 (depends on 23) The image blur correction method according to claim 23, wherein the second image blur correction apparatus controls the second correction member based on a third correction amount obtained by subtracting the first correction amount from a second correction amount for correcting the image blur that is determined based on shake occurring in the image capturing apparatus detected by a second detector; and wherein based on the first correction amount and the correction error, the first correction member is controlled so as to reduce the correction error. ### Claim 25 A non-transitory computer-readable storage medium which stores a program for causing an image blur correction apparatus to execute an image blur correction method, the image blur correction apparatus including a communication device configured to communicate with a second image blur correction apparatus that controls a second correction member configured to correct image blur of an image capturing apparatus, the image blur correction method comprising: detecting shake occurring in the image capturing apparatus; based on the shake, determining a first correction amount that is for correcting the image blur; transmitting the first correction amount to the second image blur correction apparatus via the communication device, the second image blur correction apparatus controlling the second correction member based on the first correction amount; acquiring a correction error caused by a communication delay of the first correction amount in the communication device; and controlling a first correction member configured to correct image blur of the image capturing apparatus so as to reduce the correction error, wherein in the acquiring, the correction error is acquired based on a difference between the first correction amount currently determined by the determination unit and a fourth correction amount corresponding to the first correction amount previously determined and transmitted. ### Claim 26 (depends on 25) The non-transitory computer-readable storage medium according to claim 25, wherein the second image blur correction apparatus controls the second correction member based on a third correction amount obtained by subtracting the first correction amount from a second correction amount for correcting the image blur that is determined based on shake occurring in the image capturing apparatus detected by a second detector; and wherein based on the first correction amount and the correction error, the first correction member is controlled so as to reduce the correction error.