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Camera high-precision calibration method based on optimal polarization angle

A polarization angle and polarization angle technology, which is applied in the field of high-precision camera calibration, can solve the problems of reduced camera calibration accuracy and inaccurate extraction of pixel coordinate positions, so as to reduce complexity and distortion, improve texture and color information, and meet engineering requirements. The desired effect of the application

Pending Publication Date: 2020-04-21
EAST CHINA JIAOTONG UNIVERSITY
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Problems solved by technology

Under natural conditions, when materials such as paper and plastic are collected by a camera, they all contain highlight areas to varying degrees. These highlight areas will also cause the information lost by the camera to inaccurately extract the pixel coordinate position, which will eventually lead to camera calibration accuracy. reduction of

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  • Camera high-precision calibration method based on optimal polarization angle
  • Camera high-precision calibration method based on optimal polarization angle
  • Camera high-precision calibration method based on optimal polarization angle

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Embodiment Construction

[0046] The specific implementation of the present invention is described in detail below in conjunction with accompanying drawing

[0047] Such as figure 1 As shown, the present invention adopts Zhang's camera calibration method based on polarization information-based spatial multi-pose checkerboard calibration plate image acquisition. The experiment is based on the Open CV function library of the Microsoft Visual Studio platform and the MATLAB R2014a software platform, and a GS2-GE-20S4C-C CCD camera (resolution 1624pixel×1224pixel) is used to build a single CCD camera and a two-dimensional checkerboard plane target ( A camera calibration system with specifications of 9×13, 20mm×20mm).

[0048] The invention uses a CCD camera to capture checkerboard images located at different positions in space, introduces Stokes variables to adjust the pixel intensity of the checkerboard calibration image, and obtains a checkerboard calibration image at an optimal polarization angle, and t...

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Abstract

The invention provides a camera high-precision calibration method based on an optimal polarization angle. The method aims at solving the problem that high-brightness area image texture details and color information in a calibration image are lost to influence camera calibration precision. According to reflection characteristics of a highlight area, a camera calibration model for two-dimensional pixel coordinates in checkerboard image corners is established by applying a principle that polarization imaging in physics can weaken highlight and Stokes variable linear feedback. The requirement on the camera calibration precision under the natural illumination condition is combined; and obtaining checkerboard calibration images under the optimal polarization angles of different poses in the space by utilizing the mathematical model, accurately positioning the images by utilizing a sub-pixel level detection algorithm and a Gaussian fitting method, and extracting a two-dimensional pixel calibration result of angular points in the checkerboard images. The camera calibration method based on the optimal polarization angle not only meets the high-precision requirement of the camera, but also eliminates a high-brightness area of an image part, can be applied to the fields of stereoscopic vision measurement systems, industrial manufacturing technologies and the like needing high-precision camera calibration under the condition of natural light, and has a good application prospect.

Description

technical field [0001] The invention belongs to the field of measurement technology and machine vision, and in particular relates to a design method for realizing high-precision calibration of a camera with an optimal polarization angle image. Background technique [0002] Camera calibration technology studies the mapping transformation relationship between the two-dimensional pixel coordinates of the image and the three-dimensional spatial information coordinates, which occupies a large proportion in the stereo vision measurement system. Therefore, the precise calibration of camera parameters is an indispensable part of image processing technology. The current popular camera calibration system consists of a CCD camera and a calibration target. The most commonly used calibration method proposed so far is Zhang’s calibration method, which relies on the position of the checkerboard calibration board image and corner coordinates in the two-dimensional image of the checkerboard...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/80
CPCG06T7/85
Inventor 祝振敏王心韵刘泉新
Owner EAST CHINA JIAOTONG UNIVERSITY
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