Calibration method of an image capture system

• US 9,736,468 B2
• Filed: 02/06/2015
• Issued: 08/15/2017
• Est. Priority Date: 02/19/2014
• Status: Active Grant

• Current Assignee: EYS3D Microelectronics, Co.
• Original Assignee: EYS3D Microelectronics, Co.
• Inventors: Lee, Chi-Feng
• Primary Examiner(s): Tran, Trang U
• Application Number:
  US14/615,431
• Publication Number:
  US 20150237344A1
• Time in Patent Office: 921 Days
• Field of Search: 348187, 348188, 348180
• 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 and comprises one color, wherein colors of two adjacent geometric blocks of the plurality of geometric blocks are different, and two geometric blocks of the plurality of geometric blocks are not overlapped, 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 corresponding to an interested area of each geometric block of a plurality of geometric blocks comprised in the image to simultaneously generate a plurality of color calibration parameters for different colors of the plurality of geometric blocks comprised in the image only through the test pattern; and

the calibration unit executing geometric calibration and color calibration on the image capture device according to the plurality of geometric calibration parameters and the plurality of color calibration parameters corresponding to the test pattern together.

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.