Blur correction device, interchangeable lens and image-capturing device

Patent metadata

Field	Value
Publication number	US-2020260010-A1
Application number	US-201816492809-A
Country	US
Kind code	A1
Filing date	Mar 22, 2018
Priority date	Mar 31, 2017
Publication date	Aug 13, 2020
Grant date	—

Abstract

A blur correction device includes: an input unit to which a blur quantity in at least either an image-capturing optical system or an image sensor that captures a subject image formed via the image-capturing optical system, is input; and a calculation unit that calculates, based upon the blur quantity, a correction quantity for correcting blur in the subject image, wherein: the calculation unit calculates a second correction quantity different from a first correction quantity for correcting blur in the subject image occurring on an optical axis.

First claim

1 - 4 . (canceled)

5 . A blur correction device, comprising:
an input unit to which a blur quantity in an image sensor that captures a subject image formed via an image-capturing optical system, and a position in the image sensor used for an in-focus state detection of the subject, are input; and
a calculation unit that calculates, based upon a distance between the position input to the input unit and a center of the image sensor, an off-axis correction quantity for correcting blur in the subject image occurring at a position off an optical axis.

6 . The blur correction device according to claim 5 , wherein:
the calculation unit calculates the off-axis correction quantity by using at least one of; a distance from the position off the optical axis to the optical axis, a focal length of the image-capturing optical system and a subject distance.

7 . The blur correction device according claim 5 , wherein:
the position off the optical axis is set based upon at least one of; a position of a primary subject, an extent of blur, a distance from the optical axis, a distance between the blur correction device and the subject.

8 . The blur correction device according to claim 5 , wherein:
the position off the optical axis is one of a plurality of candidate positions.

9 . The blur correction device according to claim 5 , wherein:
the position off the optical axis is a single representative position calculated based upon a plurality of candidate positions.

10 . The blur correction device according to claim 5 , wherein:
the position off the optical axis is set by taking into consideration at least one of; contrast, shape, luminance and size.

11 . The blur correction device according to claim 5 , wherein:
the position off the optical axis is set based upon at least one of; a position having been used for determining a photographing condition, a position having been used for in-focus state detection and a position having been used for determining an exposure condition.

12 . The blur correction device according to claim 5 , wherein:
the calculation unit calculates the off-axis correction quantity based upon an on-axis correction quantity corresponding to a position in the subject image taken on the optical axis and the position off the optical axis.

13 . The blur correction device according to claim 5 , wherein:
an on-axis blur quantity indicating an extent of blur in the subject image at a position on the optical axis is input to the input unit as the blur quantity; and the calculation unit calculates the off-axis correction quantity based upon the on-axis blur quantity and the position off the optical axis.

14 . The blur correction device according to claim 5 , wherein:
the calculation unit calculates an on-axis correction quantity corresponding to a position in the subject image on the optical axis and the off-axis correction quantity; and the blur correction device further comprises an output unit that outputs the on-axis correction quantity and the off-axis correction quantity.

15 . The blur correction device according to claim 5 , further comprising:
a detection unit that detects the blur quantity indicating the extent of blur originating in at least either the image-capturing optical system or the image sensor.

16 . The blur correction device according to claim 5 , further comprising:
a drive unit that drives at least part of the image-capturing optical system or the image sensor based upon the correction quantity calculated by the calculation unit.

17 . An interchangeable lens that includes the blur correction device according to claim 5 .

18 . An image-capturing device that includes the blur correction device according to claim 5 .

19 . The blur correction device according to claim 5 , wherein
distortion information of the image-capturing optical system is input to the input unit; and the blur correction device further comprising: a determination unit that determines, in accordance with the distortion information, whether or not the calculation unit calculates the off-axis correction quantity.

20 . The blur correction device according to claim 5 , wherein
the position in the image sensor used for the in-focus state detection of the subject is input to the input unit in a predetermined intervals; and the calculation unit calculates the off-axis correction quantity upon input of the position to the input unit.

21 . The blur correction device according to claim 5 , wherein
a focal length of the image-capturing optical system while the image sensor captures the subject is input to the input unit; and the calculation unit calculates the off-axis correction quantity based upon the focal length input to the input unit.

Assignees

• Nikon Corp

Inventors

• Nakajima Daiju
• Matsumoto Tsuyoshi
• Ono Yoshiko
• Mikamoto Eiji

Classifications

• H04N23/687 Primary

  by shifting the lens or sensor position · CPC title

• H04N23/671

  in combination with active ranging signals, e.g. using light or sound signals emitted toward objects · CPC title

• H04N23/683 Primary

  performed by a processor, e.g. controlling the readout of an image memory · CPC title

• H04N23/663 Primary

  for controlling interchangeable camera parts based on electronic image sensor signals · CPC title

• H04N23/6812

  based on additional sensors, e.g. acceleration sensors · CPC title