Imaging apparatus including a control unit configured to change a correction value for correcting an output of an orientation detection unit

• US 8,654,236 B2
• Filed: 06/01/2011
• Issued: 02/18/2014
• Est. Priority Date: 06/17/2010
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Shiozaki, Tomoyuki
• Primary Examiner(s): GILES, NICHOLAS G
• Application Number:
  US13/150,954
• Publication Number:
  US 20110310283A1
• Time in Patent Office: 993 Days
• Field of Search: 348/208.99, 348/208.1, 348/208.2, 348/208.3, 348/208.4, 348/208.5, 348/208.6, 348/208.7, 348/231.99, 348/231.3, 348/231.6, 348/333.01, 348/333.02, 348/333.12, 702/151, 702/152, 702/153
• US Class Current: 348/333.02
• CPC Class Codes: H04N 23/633 for displaying additional information relating to control or operation of the camera
• CPC Class Codes: H04N 23/80 Camera processing pipelines; Components thereof

Abstract

An imaging apparatus selects and extracts a longest straight line from a captured image, and superimposes the straight line on the captured image to display it by a display device. An orientation detection unit including an acceleration sensor detects a roll angle. An X axis indicating a roll angle 0° and a Y axis indicating a roll angle 90° of the acceleration sensor are superimposed on the captured image, and an original point of the X and Y axes is matched with a center value of the extracted straight line to be displayed by the display device. A user rotates, by a predetermined operation, the image until the X and Y axes match the gradient of the extracted straight line. Thus, a system control unit corrects a roll angle output value of the orientation detection unit by an amount equal to a corrected rotational angle.

Claims

1. An imaging apparatus comprising:

an imaging unit;

an orientation detection unit configured to detect an orientation of the imaging apparatus;

a display unit configured to display an image captured by the imaging unit;

a straight line extraction unit configured to extract a first straight line from the image captured by the imaging unit; and

a control unit configured to superimpose the first straight line extracted by the straight line extraction unit on the captured image and a second straight line based on the output of the orientation detection unit to be displayed by the display unit.

2. The imaging apparatus according to claim 1, wherein the control unit calculates a relative angle between an output from the orientation detection unit and a gradient of the first straight line, and wherein the control unit corrects an output of the orientation detection unit based on the relative angle.

3. The imaging apparatus according to claim 2, wherein the control unit rotates the second straight line based on the relative angle, and superimposes the second straight line which is rotated.

4. The imaging apparatus according to claim 1, wherein the first straight line extraction unit extracts a longest linear component from the captured image.

5. The imaging apparatus according to claim 1, wherein the control unit calculates a center of the first straight line, and wherein the control unit superimposes the second straight line based on the output of the orientation detection unit on the captured image so that the second straight line passes through the calculated center.

6. The imaging apparatus according to claim 1, further comprising:

an operation unit,

wherein the control unit rotates the second straight line superimposed on the captured image according to an operation of the operation unit, and

wherein the control unit corrects an output of the orientation detection unit based on the rotation angle of the second straight line based on the output of the orientation detection unit.

7. The imaging apparatus according to claim 1, further comprising:

an operation unit,

wherein the control unit rotates the captured image according to an operation of the operation unit, and

wherein the control unit corrects an output of the orientation detection unit based on the rotation angle of the captured image.

8. A method for controlling an imaging apparatus that includes an imaging unit, an orientation detection unit, and a display unit, the method comprising:

capturing an image by the imaging unit;

detecting an orientation of the imaging apparatus by the orientation detection unit;

displaying the captured image by the display unit;

extracting a first straight line from the captured image; and

performing control to superimpose the first straight line extracted from the captured image and a second straight line based on the output of the orientation detection unit to be displayed by the display unit.

9. A program embodied on a non-transitory computer-readable medium for controlling an imaging apparatus that includes an imaging unit, an orientation detection unit, and a display unit, the program comprising the steps of:

capturing an image by the imaging unit;

detecting an orientation of the imaging apparatus by the orientation detection unit;

displaying the captured image by the display unit;

extracting a first straight line from the captured image; and

performing control to superimpose the first straight line extracted from the captured image and a second straight line based on the output of the orientation detection unit to be displayed by the display unit.