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Camera-projector system calibration method based on polarization information

A calibration method and polarization information technology, applied in the direction of instruments, image data processing, measuring devices, etc., can solve the problems of loss of calibration image texture information, low camera calibration accuracy, inaccurate extraction of corner pixel coordinates, etc., to achieve corner point The pixel coordinate information is accurate and the effect of improving precision

Inactive Publication Date: 2021-10-26
EAST CHINA JIAOTONG UNIVERSITY
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Problems solved by technology

These high-light areas will lead to the loss of texture information of the calibration image, resulting in inaccurate extraction of pixel coordinates of diagonal points, and ultimately resulting in low camera calibration accuracy

Method used

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  • Camera-projector system calibration method based on polarization information
  • Camera-projector system calibration method based on polarization information
  • Camera-projector system calibration method based on polarization information

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Embodiment Construction

[0055] In order to describe the technical content of the present invention more clearly, further description will be given below in conjunction with specific embodiments. Use a CCD camera with a polarizer to collect calibration pictures at the optimal polarization angle, thereby reducing the influence of the high light area of ​​the picture. Specifically: first, a CCD camera equipped with a linear polarizer is used to collect calibration pictures in the best polarization state. Then preprocess the collected calibration pictures, use adaptive gamma correction to enhance the color contrast of the checkerboard black and white grid in the picture, and extract the printed checkerboard and projected checkerboard based on the sub-pixel corner extraction algorithm of homography matrix mapping The sub-pixel coordinate information of the corner point of the grid. Finally, on the basis of the calibration parameters of the camera, the relationship between the image coordinate system of t...

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Abstract

The invention provides a camera-projector system calibration method based on polarization information. The method comprises the following steps: (1) selecting a calibration board, and pasting a printed black and white checkerboard on the left half part of the calibration board; (2) projecting the black and white checkerboard to the right half part of the calibration board through a projector; (3) acquiring calibration pictures of different postures at the optimal polarization angle by using a CCD (Charge Coupled Device) camera provided with a linear polaroid; (4) calibrating the camera through the printed checkerboard; and (5) establishing a relation between an image coordinate system of the projector and a world coordinate system by using the projection checkerboard, and completing calibration of the projector. According to the camera-projector calibration method provided by the invention, the picture required by calibration is obtained by using polarization information, and the angular points are extracted by using a sub-pixel angular point extraction algorithm mapped by a single image matrix, so that the extraction precision of the angular points of the checkerboard is greatly improved, and the calibration accuracy of the system is obviously improved.

Description

technical field [0001] The invention relates to a calibration method of a camera-projector system, in particular to a method for recovering the texture color information of a high-light area of ​​a calibration picture by using light polarization information to improve the calibration accuracy of the camera-projector system. Background technique [0002] The structured light three-dimensional measurement system composed of cameras and projectors is widely used in industrial precision testing, quality control, solid modeling and other fields due to its advantages of high measurement accuracy, simple operation and rapid data processing. The key to accurately reconstructing 3D shapes is to precisely calibrate each element used in the structured light system, including the internal parameters characterizing the projection transformation characteristics of cameras and projectors and the external parameters of the spatial position relationship. At present, the principle and method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/80G06T7/13G06T5/00G01B11/00G01B11/24
CPCG06T7/80G06T7/13G01B11/002G01B11/2433G06T2207/20004G06T2207/20164G06T5/92
Inventor 祝振敏王胜章海亮周富强张福民
Owner EAST CHINA JIAOTONG UNIVERSITY
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