CALIBRATION METHOD OF AN IMAGE CAPTURE SYSTEM

• US 20150237344A1
• Filed: 02/06/2015
• Published: 08/20/2015
• Est. Priority Date: 02/19/2014
• Status: Active Grant

• Current Assignee: EYS3D Microelectronics, Co.
• Original Assignee: Etron Technology Inc
• Inventors: Lee, Chi-Feng
• Granted Patent: US 9,736,468 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04N 17/002 for television cameras

Abstract

A calibration method of an image capture system includes an image capture device of at least one image capture device capturing an image including a plurality of intersection coordinates among a plurality of geometric blocks of a test pattern and an information of a color of each geometric block of the plurality of geometric blocks; an operation unit executing a first operation on the plurality of intersection coordinates within the image to generate a plurality of geometric calibration parameters; the operation unit executing a second operation on an information of a color of each geometric block of the plurality of geometric blocks within the image to generate a plurality of color calibration parameters; and a calibration unit calibrating the image capture device according to the plurality of geometric calibration parameters and the plurality of color calibration parameters.

Claims

1. A calibration method of an image capture system, wherein the image capture system comprises at least one image capture device and a calibration unit, a device applied to the calibration method comprises an operation unit, a test pattern comprises a plurality of geometric blocks, and each geometric block of the plurality of geometric blocks has at least two sides, the calibration method comprising:

an image capture device of the at least one image capture device capturing an image comprising a plurality of intersection coordinates among the plurality of geometric blocks of the test pattern and a color information of the each geometric block of the plurality of geometric blocks of the test pattern;

the operation unit executing a first operation on a plurality of intersection coordinates comprised in the image to generate a plurality of geometric calibration parameters;

the operation unit executing a second operation on a color information of each geometric block of a plurality of geometric blocks comprised in the image to generate a plurality of color calibration parameters; and

the calibration unit calibrating the image capture device according to the plurality of geometric calibration parameters and the plurality of color calibration parameters.

2. The calibration method of claim 1, wherein a color of the each geometric block of the plurality of geometric blocks is different from a color of a substrate supporting the test pattern and is used for defining a profile of the each geometric block of the plurality of geometric blocks, wherein the color of the each geometric block is a uniform color or a gradient color.

3. The calibration method of claim 1, wherein the first operation is a linear regression calculation.

4. The calibration method of claim 1, wherein the second operation is a linear regression calculation.

5. The calibration method of claim 1, wherein the each geometric block of the plurality of geometric blocks comprises a uniform color area, and colors of uniform color areas comprised in the plurality of geometric blocks are identical each other.

6. The calibration method of claim 5, wherein a color of the uniform color area is different from a color of the each geometric block.

7. The calibration method of claim 5, wherein a color of the uniform color area is a white color.

8. The calibration method of claim 5, further comprising:

the operation unit executing a third operation on the uniform color area comprised in the each geometric block of the plurality of geometric blocks comprised in the image to generate a lens shading parameter; and

the calibration unit calibrating the image capture device according to the lens shading parameter.

9. A calibration method of an image capture system, wherein the image capture system comprises at least one image capture device and a calibration unit, a device applied to the calibration method comprises an operation unit, each test pattern of a plurality of test patterns comprises a plurality of geometric blocks, and each geometric block of the plurality of geometric blocks has at least two sides, the calibration method comprising:

an image capture device of the at least one image capture device capturing an image comprising a plurality of intersection coordinates among the plurality of geometric blocks of the each test pattern and a color information of the each geometric block of the plurality of geometric blocks;

the operation unit executing a first operation on a plurality of intersection coordinates among a plurality of geometric blocks comprised in each image of a plurality of images corresponding to the plurality of test patterns to generate a plurality of geometric calibration parameters;

the operation unit executing a second operation on a color information of each geometric block of a plurality of geometric blocks comprised in each image of the plurality of images corresponding to the plurality of test patterns, or on a color information of each geometric block of a plurality of geometric blocks comprised in an image of the plurality of images corresponding to the plurality of test patterns to generate a plurality of color calibration parameters; and

the calibration unit calibrating the image capture device according to the plurality of geometric calibration parameters and the plurality of color calibration parameters.

10. The calibration method of claim 9, wherein a color of the each geometric block of the plurality of geometric blocks is different from a color of a substrate supporting the each test pattern and is used for defining a profile of the each geometric block, wherein the color of the each geometric block is a uniform color or a gradient color.

11. The calibration method of claim 9, wherein the first operation is a linear regression calculation.

12. The calibration method of claim 9, wherein the second operation is a linear regression calculation.

13. The calibration method of claim 9, wherein the each test pattern of the plurality of test patterns is located on a corresponding plane, and a different relative angle exists between the corresponding plane and the image capture device.

14. The calibration method of claim 9, wherein the each test pattern of the plurality of test patterns is generated by display patterns displayed on a plurality of stacked transparent display panels, wherein each transparent display panel of the plurality of transparent display panels is not perpendicular to a lens plane of the image capture device, and the plurality of transparent display panels are stacked not perpendicular to the lens plane of the image capture device.

15. The calibration method of claim 9, wherein the each test pattern of the plurality of test patterns is generated by a three-dimensional display panel.

16. A calibration method of an image capture system, wherein the image capture system comprises at least one image capture device and a calibration unit, a device applied to the calibration method comprises an operation unit, a test pattern comprises a plurality of geometric blocks, and each geometric block of the plurality of geometric blocks has at least two sides, the calibration method comprising:

an image capture device of the at least one image capture device capturing a plurality of images, wherein each image of the plurality of images comprises a plurality of intersection coordinates among the plurality of geometric blocks of the test pattern and a color information of the each geometric block of the plurality of geometric blocks of the test pattern and corresponds to a relative angle;

the operation unit executing a first operation on a plurality of intersection coordinates among a plurality of geometric blocks comprised in each image of the plurality of images to generate a plurality of geometric calibration parameters;

the operation unit executing a second operation on a color information of each geometric block of a plurality of geometric blocks comprised in each image of the plurality of images, or on a color information of each geometric block of a plurality of geometric blocks comprised in an image of the plurality of images to generate a plurality of color calibration parameters; and

the calibration unit calibrating the image capture device according to the plurality of geometric calibration parameters and the plurality of color calibration parameters.

17. The calibration method of claim 16, wherein the test pattern is installed on a mechanical apparatus, the mechanical apparatus rotates and moves the test pattern to generate a relative angle and a relative distance between the test pattern and the image capture device, and the relative angle and the relative distance corresponds to an image of the plurality of images.

18. The calibration method of claim 16, wherein a color of the each geometric block of the plurality of geometric blocks is different from a color of a substrate supporting the test pattern and is used for defining a profile of the each geometric block, wherein the color of the each geometric block is a uniform color or a gradient color.

19. The calibration method of claim 16, wherein the first operation is a linear regression calculation.

20. The calibration method of claim 16, wherein the second operation is a linear regression calculation.