Compensation method of calibration plate circular mark point imaging deviation in digital imaging system
A technology of digital imaging system and compensation method, applied in image analysis, image data processing, instrument, etc.
Inactive Publication Date: 2013-12-11
HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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The disadvantage of this method is that it is necessary to give the relative height between the center of the circle on the calibration board and the origin of the coordinates in space, which cannot be done before the calibration of the camera is completed, because the relative position of the plane of the calibration board and the camera is arbitrary
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[0046] The compensation method for the imaging deviation of the circular mark point on the calibration plate in the digital imaging system. The method is based on the pinhole imaging model and the calculated calibration plate model. The center of the circular mark point obtained according to the set calibration plate plane coincides with the XY plane of world coordinates Compensating the deviation value of the center point of the ellipse mapped on the imaging plane П with the circular mark point is characterized in that: the method is realized by the following steps:
[0047] ①. The calculated coordinate system in which the set calibration board plane coincides with the XY plane of the world coordinates, the coordinate origin is arbitrarily selected, the three-dimensional coordinates of the circular mark points on the calibration board are established, and the center of all circular mark points is set according to the above settings The coordinate is Z=0;
[0048] ②. Take the image...
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The invention provides a compensation method of calibration plate circular mark point imaging deviation in a digital imaging system, and solves a technical detect that in the compensation method for conquering existing deviation, relative height of the center of a circle and an origin of a coordinate on the calibration plate is needed spatially, which makes calculation complicated. Based on pin hole imaging model and a calculation calibration plate model and according to deviation value, which is obtained by superposition of presupposed calibration plate plane and world coordinate-Y[U1] plane, of circular mark point center and the mapping ellipse center point of the circular mark point, compensation is performed by the method. The beneficial effects of the compensation method are that the compensation method has advantages of being high in efficiency, great in reliability, easy to carry out, etc. The calculation process does not rely on any camera parameters or image shooting position information. The compensation and calculation are all performed automatically so that manual interventions or other means for help are not needed, and thus the compensation method is convenient and flexible to use.
Description
Technical Field: [0001] The invention belongs to the technical field of digital image processing, and particularly relates to a method for compensating the imaging deviation of circular mark points on a calibration plate in a digital imaging system. Background technique [0002] Circular marking points have obvious characteristics, easy to make, and convenient to use. They are the most common type of graphics in digital imaging and are widely used in target detection, camera calibration, and three-dimensional measurement. [0003] In general, the circular feature mark is not always facing the imaging plane, that is, when the shooting position is not vertical, because the perspective projection is a non-conformal transformation, the circular mark is imaged according to the pinhole imaging model. Is mapped to a standard ellipse. Obviously, the center of the circle and the center of the ellipse in the image are not the same point, but have a certain offset. The greater the angle betw...
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IPC IPC(8): G06T7/00
Inventor 孟祥林赵灿何万涛程俊廷车向前周波
Owner HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY