IMAGE CAPTURE APPARATUS AND CONTROL METHOD THEREFOR

• US 20150172549A1
• Filed: 02/23/2015
• Published: 06/18/2015
• 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
• Granted Patent: US 9,538,082 B2
• Time in Patent Office: Days
• 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:

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 detection unit;

a composition unit configured to compose a first translation component and a perspective component calculated by using the rotational shake amount calculated by said rotational shake calculation unit and a second translation component calculated by using the translational shake amount calculated by said translational shake calculation unit; 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 detection unit to a result obtained by converting a correction amount optically corrected by said optical correction unit into a moving amount on an imaging plane.

3. The apparatus according to claim 2,

wherein said correction amount calculation unit subtracts 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;

the rotational shake detection unit; and

the motion vector detection unit.

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

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

a translational shake calculation step of calculating 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 detection unit;

a composition step of composing a first translation component and a perspective component calculated by using the rotational shake amount calculated by said rotational shake calculation unit and a second translation component calculated by using the translational shake amount calculated by said translational shake calculation unit; and

a correction amount calculation step of 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.