Optical apparatus and image capturing apparatus, and method of controlling the same and storage medium

Patent metadata

Field	Value
Publication number	US-9170429-B2
Application number	US-201314138278-A
Country	US
Kind code	B2
Filing date	Dec 23, 2013
Priority date	Dec 27, 2012
Publication date	Oct 27, 2015
Grant date	Oct 27, 2015

Abstract

An optical apparatus includes an imaging optical system, an image capturing unit, a focal length detection unit, an object distance detection unit, a walking shooting determination unit, a sensitivity generation unit configured to generate sensitivity of the correction optical system, a correction amount calculation unit configured to calculate a correction amount of the correction optical system based on the shake amount and the sensitivity, and a control unit configured to drive the correction optical system based on the correction amount. The sensitivity generation unit generates the sensitivity by limiting the object distance or the focal length, or a range of the sensitivity when it is determined that the user of an image capturing apparatus is walking.

First claim

What is claimed is:

1. An optical apparatus comprising:
an imaging optical system including a correction lens, which corrects an image blur, a zoom lens for changing a focal length, and a focus lens, which performs focus adjustment;
a focal length detection unit configured to detect the focal length of an imaging optical system;
an object distance detection unit configured to detect an object distance;
a shake detection unit configured to detect a shake amount;
a walking shooting determination unit configured to determine whether or not a user of the optical apparatus is walking based on the shake amount detected by the shake detection unit;
a sensitivity generation unit configured to generate sensitivity, which is a ratio of a moving amount of an object image on an image sensing plane to a moving amount of the correction lens, based on a determination result by the walking shooting determination unit, the focal length, and the object distance;
a correction amount calculation unit configured to calculate a correction amount based on the shake amount and the sensitivity; and
a control unit configured to drive the imaging optical system to correct the image blur based on the correction amount,
wherein the sensitivity generation unit generates the sensitivity by limiting at least one of the object distance or the focal length, or a range of the sensitivity when the walking shooting determination unit determines that the user of the optical apparatus is walking.

2. The apparatus according to claim 1 , wherein the sensitivity generation unit generates the sensitivity in a case in which the object distance is set to a fixed value when the walking shooting determination unit determines that the user of the apparatus is walking.

3. The apparatus according to claim 2 , wherein the sensitivity generation unit generates the sensitivity in a case in which the object distance is set to an infinity distance when the walking shooting determination unit determines that the user of the apparatus is walking.

4. The apparatus according to claim 1 , wherein the sensitivity generation unit generates the sensitivity by limiting the object distance to near an infinity distance when the walking shooting determination unit determines that the user of the apparatus is walking.

5. The apparatus according to claim 1 , wherein the sensitivity generation unit generates the sensitivity by limiting the object distance or a range of the sensitivity only in a focal length range further on a wide side than a predetermined focal length when the walking shooting determination unit determines that the user of the apparatus is walking.

6. The apparatus according to claim 1 , further comprising a storage unit configured to store a plurality of pieces of discrete sensitivity information for the focal length and the object distance,
wherein the sensitivity generation unit generates the sensitivity by an interpolation operation from the sensitivity information stored in the storage unit based on the focal length and the object distance detected by the focal length detection unit and the object distance detection unit.

7. An image capturing apparatus comprising an optical apparatus of claim 1 .

8. A method of controlling an optical apparatus, the method comprising:
detecting a focal length of an imaging optical system;
detecting an object distance;
detecting a shake amount;
determining whether or not a user of the optical apparatus is walking based on the detected shake amount;
generating sensitivity, which is a ratio of a moving amount of an object image on an image sensing plane to a moving amount of a correction lens which corrects an image blur, based on a determination result by the determining step, the focal length, and the object distance;
calculating a correction amount based on the shake amount and the sensitivity; and
driving the correction lens to correct the image blur based on the correction amount,
wherein the sensitivity is generated by limiting at least one of the object distance or the focal length, or a range of the sensitivity when it is determined that the user of the optical apparatus is walking.

9. A non-transitory computer-readable storage medium storing a program for causing a computer to execute each step of the method of claim 8 .

10. An image blur correction apparatus comprising:
a processing circuit; and
a memory in communication with the processing circuit, the memory including instructions that, when executed by the processing circuit, cause the image blur correction apparatus to:
detect a focal length of an imaging optical system;
detect an object distance;
detect a shake amount;
determine whether or not a user of the image blur correction apparatus is walking based on the detected shake amount;
generate sensitivity, which is a ratio of a moving amount of an object image on an image sensing plane to a moving amount of a correction lens which corrects an image blur and is included in the imaging optical system forming the object image, based on a determination of whether or not the user is walking, the focal length changed by a zoom lens included in the imaging optical system, and the object distance;
calculate a correction amount based on the shake amount and the sensitivity; and
drive the correction lens to correct the image blur based on the correction amount, wherein the sensitivity is generated by limiting at least one of the object distance or the focal length, or a range of the sensitivity when it is determined that the user of the image apparatus is walking.

11. The apparatus according to claim 10 , wherein the sensitivity is generated in a case in which the object distance is set to a fixed value when it is determined that the user of the apparatus is walking.

12. The apparatus according to claim 11 , wherein the sensitivity is generated in a case in which the object distance is set to an infinity distance when it is determined that the user of the apparatus is walking.

13. An image blur correction apparatus comprising:
a processing circuit; and
a memory in communication with the processing circuit, the memory including instructions that, when executed by the processing circuit, cause the apparatus to:
detect a focal length of an imaging optical system;
detect an object distance;
detect a shake amount;
determine whether or not a change in an output signal corresponding to a detected shake amount is larger than a predetermined amplitude;
generate sensitivity, which is a ratio of a moving amount of an object image on an image sensing plane to a moving amount of a correction lens, based on the detected shake amount, the focal length changed by a zoom lens included in the imaging optical system, and the object distance;
calculate a correction amount based on the detected shake amount and the sensitivity; and
drive the correction lens to correct the image blur based on the correction amount, wherein the sensitivity is generated by limiting at least one of the object distance or the focal length, or a range of the sensitivity when the output signal corresponding to the detected shake amount is determined to be larger than the predetermined amplitude.

14. The apparatus according to claim 13 , wherein the sensitivity is generated in a case in which the object distance is set to a fixed value when the output signal corresponding to the detected shake amount is determined to be larger than the predetermined amplitude.

15. The apparatus according to claim 14 , wherein the sensitivity is generated in a case in which the object distance is set to an infinity distance when the output signal

Assignees

• Canon Kk

Inventors

• Shibata Masahiro

Classifications

• G03B5/00

  Adjustment of optical system relative to image or object surface other than for focusing · CPC title

• G02B27/646 Primary

  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) · CPC title

• H04N23/68

  for stable pick-up of the scene, e.g. compensating for camera body vibrations · CPC title

• H04N5/23248

  Electricity · mapped topic