Control apparatus, image pickup apparatus, lens apparatus, control method, and storage medium, that reduce image point movement at an out-of-focus position

Patent metadata

Field	Value
Publication number	US-12520049-B2
Application number	US-202318515568-A
Country	US
Kind code	B2
Filing date	Nov 21, 2023
Priority date	Nov 29, 2022
Publication date	Jan 6, 2026
Grant date	Jan 6, 2026

Abstract

A control apparatus for processing image data acquired through an imaging optical system and an image sensor acquires first information corresponding to a magnification that is different according to an image height and second information corresponding to a magnification that is constant regardless of the image height, the first information and the second information being associated with the imaging optical system, and processes the image data using the first information and the second information to reduce image point movement at an out-of-focus position of the imaging optical system.

First claim

What is claimed is:

1 . A control apparatus for processing image data acquired through an imaging optical system and an image sensor, the control apparatus comprising:
a memory configured to store instructions; and a processor configured to execute the instructions to:
acquire first information corresponding to a magnification that is different according to an image height and second information corresponding to a magnification that is constant regardless of the image height, the first information and the second information being associated with the imaging optical system; and
process the image data using the first information and the second information to reduce image point movement at an out-of-focus position of the imaging optical system,
wherein the following inequality is satisfied at one of a far end or a close end of the imaging optical system:
0.002<|( y/R )−1|<0.200,

where y is the second information and R=finf/Limgmod, finf being a focal length of the imaging optical system in an in-focus state at infinity and Limgmod being a distance from a rear principal point position to an image plane in an in-focus state on an object at a position closer to the image sensor than infinity.

2 . The control apparatus according to claim 1 , wherein:
the first information is aberration correction information for each in-focus position of the imaging optical system, and the second information is breathing correction information at the out-of-focus position.

3 . The control apparatus according to claim 1 , wherein the processor acquires the first information and the second information from a lens apparatus through communication with the lens apparatus.

4 . The control apparatus according to claim 1 , wherein the following inequality is satisfied:
0.002<finf+((Limgmod/Lobjmod)×Lipmod)<0.100,
where Lobjmod is a distance from a front principal plane to the object and Lipmod is a distance between a paraxial entrance pupil position and the object.

5 . The control apparatus according to claim 1 , wherein the following inequality is satisfied:
0.005<|β Oβ 2/β Oβ 1−1|<1.500,
where βOβ1=Y2OB1/Y1OB1, βOB2=Y2OB2/Y1OB2, βOB1 is a ratio between an object height Y1OB1 on the enlargement side conjugate plane corresponding to light reaching a height Y1 on the reduction side conjugate plane and an object height Y2OB1 corresponding to light reaching a height Y2 of the reduction side conjugate plane, and βOB2 is a ratio between an object height Y1OB2 at a position different from the enlargement side conjugate plane corresponding to the light reaching the height Y1 on the reduction side conjugate plane and an object height Y2OB2 at a position different from the enlargement side conjugate plane corresponding to the light reaching the height Y2 on the reduction side conjugate plane.

6 . The control apparatus according to claim 1 , wherein the processor simultaneously performs correction processing using the first information and correction processing using the second information.

7 . The control apparatus according to claim 1 , wherein the processor is configured to trim the image data using the first information and the second information to reduce image point movement at the out-of-focus position of the imaging optical system.

8 . An image pickup apparatus comprising:
an image sensor; and the control apparatus according to claim 1 .

9 . A lens apparatus comprising:
an imaging optical system; a memory configured to store first information corresponding to a magnification that is different according to an image height and second information corresponding to a magnification that is constant regardless of the image height, the first information and the second information being associated with the imaging optical system; and a communication unit configured to transmit the first information and the second information to an image pickup apparatus in response to a request from the image pickup apparatus, wherein the first information and the second information are used to process image data from an image sensor so as to reduce image point movement at an out-of-focus position of the imaging optical system, and wherein the following inequality is satisfied at one of a far end or a close end of the imaging optical system:
0.002<|( y/R )−1|<0.200,

where y is the second information and R=finf/Limgmod, finf being a focal length of the imaging optical system in an in-focus state at infinity and Limgmod being a distance from a rear principal point position to an image plane in an in-focus state on an object at a position closer to the image sensor than infinity.

10 . The lens apparatus according to claim 9 , wherein in an in-focus state at a first object distance, magnification of a captured image of an object at a second object distance is different for each angle of view.

11 . A control method for processing image data acquired through an imaging optical system and an image sensor, the control method comprising:
an acquiring step of acquiring first information corresponding to a magnification that is different depending on an image height and second information corresponding to a magnification that is constant regardless of the image height, the first information and the second information being associated with the imaging optical system; and a processing step of processing the image data using the first information and the second information to reduce image point movement at an out-of-focus position of the imaging optical system, wherein the following inequality is satisfied at one of a far end or a close end of the imaging optical system:
0.002<|( y/R )−1|<0.200,

where y is the second information and R=finf/Limgmod, finf being a focal length of the imaging optical system in an in-focus state at infinity and Limgmod being a distance from a rear principal point position to an image plane in an in-focus state on an object at a position closer to the image sensor than infinity.

12 . A non-transitory computer-readable storage medium storing a program executable by a computer to execute the control method according to claim 11 .

13 . A control apparatus for processing image data acquired through an imaging optical system and an image sensor, the control apparatus comprising:
a memory configured to store instructions; and a processor configured to execute the instructions to:
acquire first information corresponding to a magnification that is different according to an image height and second information corresponding to a magnification that is constant regardless of the image height, the first information and the second information being associated with the imaging optical system; and
process the image data using the first information and the second information to reduce image point movement at an out-of-focus position of the imaging optical system,
wherein the following inequality is satisfied:
0.002<finf+((Limgmod/Lobjmod)×Lipmod)<0.100,

where finf is a focal length of the imaging optical system in an in-focus state at infinity, Limgmod is a distance from a rear principal point position to an image plane in an in-focus state on an object at a position closer to the image sensor than infinity, Lobjmod is a distance from a front principal plane to the object, and Lipmod is a distance between a paraxial entrance pupil position and the object.

Assignees

• Canon Kk

Inventors

• Ode Takashi

Classifications

• H04N23/81 Primary

  for suppressing or minimising disturbance in the image signal generation · CPC title

• H04N23/80

  Camera processing pipelines; Components thereof · CPC title

• H04N23/67 Primary

  Focus control based on electronic image sensor signals · CPC title

• H04N23/54

  Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils · CPC title

• H04N23/55 Primary

  Optical parts specially adapted for electronic image sensors; Mounting thereof · CPC title