Image capture apparatus and control method therefor

• US 9,538,082 B2
• Filed: 02/23/2015
• Issued: 01/03/2017
• Est. Priority Date: 10/22/2012
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Watanabe, Takeshi, Miyasako, Kenichi
• Primary Examiner(s): Ho, Tuan
• Assistant Examiner(s): Camargo, Marly
• Application Number:
  US14/628,802
• Publication Number:
  US 20150172549A1
• Time in Patent Office: 680 Days
• Field of Search: 348/208.99, 348/208.1, 348/208.2, 348/208.3, 348/208.4, 348/208.6, 348/208.11, 348/208.12, 348/208.13, 348/222.1, 348/345, 396/52, 382/255, 382/107, 382/261, 382/263, 382/264, 375/240.16, 375/240.22
• US Class Current: 1/1
• CPC Class Codes: 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
• CPC Class Codes: H04N 23/6812 based on additional sensors, e.g. acceleration sensors
• CPC Class Codes: H04N 23/682 Vibration or motion blur correction
• CPC Class Codes: H04N 23/683 performed by a processor, e.g. controlling the readout of an image memory

Abstract

An image capture apparatus comprises a first shake detection unit configured to detect a shake of the image capture apparatus, a rotational shake calculation unit configured to calculate a rotational shake amount, a second shake detection unit configured to detect the shake of the image capture apparatus, a translational shake calculation unit configured to calculate a translational shake amount, a correction amount calculation unit configured to calculate, based on the rotational shake amount and the translational shake amount, a correction amount for correcting image blurring, and a correction unit configured to correct the image blurring, wherein the rotational shake calculation unit calculates a first translational motion component and perspective component, and wherein the correction amount calculation unit calculates a second translational motion component.

Claims

1. An image stabilization apparatus comprising at least one hardware processor or circuit configured to perform the operations of the following units:

a rotational shake calculation unit configured to calculate a rotational shake amount based on an output of a rotational shake detection unit;

a translational shake calculation unit configured to calculate a translational shake amount using a subtraction result value acquired by subtracting the rotational shake amount output by said rotational shake calculation unit from shake amount including a rotational shake amount and a translational shake amount output by a motion vector detector;

a component calculation unit configured to calculate a first translation component and a perspective component using the rotational shake amount calculated by the rotational shake calculation unit and calculate a second translation component using the translational shake amount calculated using the subtraction result value; and

a correction amount calculation unit configured to calculate, based on the first translation component, the perspective component and the second translation component, a correction amount for correcting image blurring of an image.

2. The apparatus according to claim 1, wherein said translational shake calculation unit calculates the translational shake amount by using a subtraction result value acquired by subtracting the rotational shake amount output by said rotational shake calculation unit from an addition result value acquired by adding a shake amount including a rotational shake amount and a translational shake amount output by the motion vector detector to a result obtained by converting a correction amount optically corrected by an optical correction unit into a moving amount on an imaging plane.

3. The apparatus according to claim 2, wherein said correction amount calculation unit calculates a subtraction result value by subtracting the result obtained by converting a correction amount optically corrected by said optical correction unit into a moving amount on an imaging plane from the correction amount calculated based on the first translation component, the perspective component and the second translation component.

4. An image capturing apparatus comprising:

the image stabilization apparatus according to claim 1;

a sensor comprising the rotational shake detection unit; and

the motion vector detector.

6. The apparatus according to claim 3, further comprising an electronic image stabilization unit configured to electronically correct the image blurring by moving a cutout area in an imaging range of an image sensor based on a calculation result of the correction amount calculation unit, wherein the electronic image stabilization unit corrects the image blurring using the subtraction result value.

5. A method of controlling an image stabilization apparatus comprising:

calculating a rotational shake amount based on an output of a rotational shake detection unit;

calculating a translational shake amount using a subtraction result value acquired by subtracting the rotational shake amount output in the calculation of the rotational shake amount from shake amount including a rotational shake amount and a translational shake amount output by a motion vector detector;

calculating a first translation component and a perspective component using the rotational shake amount calculated based on the output of the rotational shake detection unit and calculating a second translation component using the translational shake amount calculated using the subtraction result value; and

calculating, based on the first translation component, the perspective component and the second translation component, a correction amount for correcting image blurring of an image.