IMAGE CAPTURE APPARATUS

• US 20140111661A1
• Filed: 10/14/2013
• Published: 04/24/2014
• 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 9,219,863 B2
• Time in Patent Office: Days
• US Class Current: 348/208.6
• CPC Class Codes: G06T 2207/20201 Motion blur correction
• CPC Class Codes: G06T 5/003 Deblurring; Sharpening vibration or motion blur correction for cameras comprising an electronic image sensor H04N23/682
• CPC Class Codes: G06T 5/73 Deblurring; Sharpening
• CPC Class Codes: H04N 23/6812 based on additional sensors, e.g. acceleration sensors
• CPC Class Codes: H04N 23/683 performed by a processor, e.g. controlling the readout of an image memory
• CPC Class Codes: H04N 23/687 by shifting the lens or sensor position

Abstract

An image capture apparatus comprises a shake detection unit configured to detect a shake, a translational motion correction amount calculation unit configured to calculate a first correction amount for correcting a translational motion component, a perspective component correction amount calculation unit configured to calculate a second correction amount for correcting a perspective component, an image stabilization unit configured to correct the image blurring of the captured image based on the first and second correction amount, and a control unit configured to restrict, if a panning state of the image capture apparatus is determined, the translational motion correction amount calculation unit and the perspective component correction amount calculation unit so as to decrease correction capability for the translational motion component and the perspective component.

Claims

1. An image capture apparatus comprising:

a shake detection unit configured to detect a shake of said image capture apparatus;

a translational motion correction amount calculation unit configured to calculate, based on an output of said shake detection unit, a first correction amount for correcting a translational motion component of image blurring generated in a captured image due to the shake;

a perspective component correction amount calculation unit configured to calculate, based on the output of said shake detection unit, a second correction amount for correcting a perspective component of the image blurring generated in the captured image due to the shake;

an image stabilization unit configured to correct the image blurring of the captured image based on the first correction amount and the second correction amount; and

a control unit configured to restrict, if a panning state of said image capture apparatus is determined, said translational motion correction amount calculation unit and said perspective component correction amount calculation unit so as to decrease correction capability for the translational motion component and the perspective component.

2. The apparatus according to claim 1,

wherein said perspective component correction amount calculation unit calculates the second correction amount using the first correction amount.

3. The apparatus according to claim 1,

wherein said image stabilization unit includes

an optical correction unit configured to optically correct the image blurring generated in the captured image due to the shake, and

an electronic correction unit configured to electronically correct the image blurring generated in the captured image due to the shake, and

said image capture apparatus further comprises a division unit configured to divide the first correction amount into a third correction amount to be corrected by said optical correction unit and a fourth correction amount to be corrected by said electronic correction unit at a predetermined ratio.

4. The apparatus according to claim 1,

wherein each of said translational motion correction amount calculation unit and said perspective component correction amount calculation unit includes a high-pass filter, and

said control unit changes cutoff frequencies of said high-pass filters so as to limit the first correction amount and the second correction amount.

5. The apparatus according to claim 1,

wherein each of said translational motion correction amount calculation unit and said perspective component correction amount calculation unit includes an integration unit, and

said control unit changes time constants of said integration units so as to limit the first correction amount and the second correction amount.

6. The apparatus according to claim 1,

wherein said control unit performs a control operation so that a characteristic of said translational motion correction amount calculation unit is substantially the same as a characteristic of said perspective component correction amount calculation unit.

7. An image capture apparatus comprising:

a shake detection unit configured to detect a shake of said image capture apparatus;

a translational motion correction amount calculation unit configured to calculate, based on an output of said shake detection unit, a first correction amount for correcting a translational motion component of image blurring generated in a captured image due to the shake;

a perspective component correction amount calculation unit configured to calculate, based on the output of said shake detection unit, a second correction amount for correcting a perspective component of the image blurring generated in the captured image due to the shake;

an image stabilization unit configured to correct the image blurring of the captured image based on the first correction amount and the second correction amount; and

a control unit configured to change correction capability for the translational motion component and the perspective component, based on at least one of the first correction amount and the second correction amount.

8. An image capture apparatus comprising:

a shake detection unit configured to detect a shake of said image capture apparatus;

a translational motion correction amount calculation unit configured to calculate, based on an output of said shake detection unit, a first correction amount for correcting a translational motion component of image blurring generated in a captured image due to the shake;

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

a correction unit configured to correct the image blurring based on the first correction amount and the second correction amount.

9. An image capture apparatus comprising:

a shake detection unit configured to detect a shake of said image capture apparatus;

a perspective component correction amount calculation unit configured to calculate, based on an output of said shake detection unit, a first correction amount for correcting a perspective component of the image blurring;

a translational motion correction amount calculation unit configured to calculate, based on the first correction amount, a second correction amount for correcting a translational motion component of image blurring generated in a captured image due to the shake; and

a correction unit configured to correct the image blurring based on the first correction amount and the second correction amount.