IMAGE CAPTURE APPARATUS AND CONTROL METHOD THEREFOR

• US 20140111659A1
• 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: Miyasako, Kenichi, Watanabe, Takeshi
• Granted Patent: US 9,225,900 B2
• Time in Patent Office: Days
• US Class Current: 348/208.1
• CPC Class Codes: G06T 5/73 Deblurring; Sharpening
• CPC Class Codes: H04N 23/68 for stable pick-up of the scene, e.g. compensating for camera body vibrations
• 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

Abstract

An image capture apparatus comprises shake detection unit configured to detect a shake of the image capture apparatus translation component correction amount calculation unit configured to calculate, based on an output of the shake detection unit, a first correction amount configured to correct a translation component of image blurring generated in a captured image due to the shake, 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 correction unit configured to correct the image blurring based on the first correction amount and the second correction amount.

Claims

1. An image capture apparatus comprising:

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

a translation component correction amount calculation unit configured to calculate, based on an output of said shake detection unit, a first correction amount for correcting a translation 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.

2. The apparatus according to claim 1, wherein

said perspective component correction amount calculation unit calculates the second correction amount by dividing the first correction amount by a square of a focal length of an imaging optical system.

3. An image capture apparatus comprising:

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

a translation component correction amount calculation unit configured to calculate a first correction amount for correcting a translation component of image blurring generated in a captured image due to the shake;

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

a calculation unit configured to perform, before calculating the first correction amount and the second correction amount, calculation necessary for calculating a translation component and a perspective component, based on the output of said shake detection unit.

4. The apparatus according to claim 3, wherein

said perspective component correction amount calculation unit calculates a correction amount of the perspective component by dividing an output of said calculation unit by a focal length of an imaging optical system of said image capture apparatus.

5. An image capture apparatus comprising:

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

an optical correction amount calculation unit configured to calculate, based on the output of said shake detection unit, an optical correction amount which is a correction amount for optically correcting the translation component of the image blurring generated in the captured image due to the shake;

an optical correction unit configured to optically correct the image blurring generated in the captured image due to the shake based on said optical correction amount,

a translation component electronic correction amount calculation unit configured to calculate a electronic correction amount which is a correction amount for electronically correcting the translation component of the image blurring generated in the captured image due to the shake;

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

a correction unit configured to correct the image blurring based on the electronic correction amount and the perspective correction amount.

6. The apparatus according to claim 5, wherein

said perspective component correction amount calculation unit calculates the correction amount by dividing a result obtained by adding, to the electronic correction amount, a result obtained by converting the optical correction amount into a moving amount on an imaging plane by a square of a focal length of an imaging optical system of said image capture apparatus.

7. A control method for an image capture apparatus, comprising:

a shake detection step of detecting a shake of the image capture apparatus;

a translation component correction amount calculation step of calculating, based on an output in the shake detection step, a first correction amount for correcting a translation component of image blurring generated in a captured image due to the shake;

a perspective component correction amount calculation step of calculating, based on the output in the shake detection step, a second correction amount for correcting a perspective component of the image blurring; and

a correction step of correcting the image blurring based on the first correction amount and the second correction amount,

wherein in the perspective component correction amount calculation step, the second correction amount is calculated using the first correction amount.

8. A control method for an image capture apparatus, comprising:

shake detection step of detecting a shake of said image capture apparatus;

translation component correction amount calculation step of calculating a first correction amount for correcting a translation component of image blurring generated in a captured image due to the shake;

perspective component correction amount calculation step of calculating a second correction amount for correcting a perspective component of the image blurring; and

calculation step of performing, before calculating the first correction amount and the second correction amount, calculation necessary for calculating a translation component and a perspective component, based on the output of said shake detection step.

9. A control method for an image capture apparatus, comprising:

shake detection step of detecting a shake of said image capture apparatus;

optical correction amount calculation step of calculating, based on the output of said shake detection step, an optical correction amount which is a correction amount for optically correcting the translation component of the image blurring generated in the captured image due to the shake;

optical correction step of optically correcting the image blurring generated in the captured image due to the shake based on said optical correction amount, translation component electronic correction amount calculation step of calculating a electronic correction amount which is a correction amount for electronically correcting the translation component of the image blurring generated in the captured image due to the shake;

perspective component correction amount calculation step of calculating, based on the optical correction amount and electronic correction amount, a correction amount for correcting a perspective component of the image blurring; and

correction step of correcting the image blurring based on the electronic correction amount and the perspective correction amount.