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Method for measuring image principal point coordinates and distortion coefficient of linear target

An image coordinate system and measurement method technology, applied in image data processing, image analysis, instruments, etc., can solve the problems of inability to calculate image distortion and affecting image distortion coefficients.

Inactive Publication Date: 2012-11-28
SOUTHEAST UNIV
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Problems solved by technology

However, these two methods cannot perform distortion calculations on existing images. In particular, the coordinates of the principal point of the image will also affect the calibration of the image distortion coefficient

Method used

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  • Method for measuring image principal point coordinates and distortion coefficient of linear target
  • Method for measuring image principal point coordinates and distortion coefficient of linear target
  • Method for measuring image principal point coordinates and distortion coefficient of linear target

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Embodiment Construction

[0067] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0068] like figure 1 Shown, the measuring method of the principal point coordinate and distortion coefficient of the image of a kind of linear target of the present invention, comprises the following steps:

[0069] 10. The linear equation of the symmetric axis of the imaging curve target:

[0070] 101. Use the camera equipment to take pictures of the linear target to obtain an image, and the linear target is displayed as a symmetrical curve on the image; establish an image coordinate system o-xy with the center of the image as the origin, the abscissa as the x-axis, and the ordinate as the y-axis;

[0071] 102. Select m symmetrical curves from the image as the measurement object, m is an integer, and m≥2, select a symmetrical curve to perform the operation from step 103 to step 110;

[0072] 103. Select n image points from the measuremen...

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Abstract

The invention discloses a method for measuring the image principal point coordinates and distortion coefficient of a linear target. The method comprises the following steps of: 10, imaging a symmetry axis linear equation of a curve target: fitting the measured object, and calculating the slope of the symmetry axis of the measured object; converting the image points of the measured object to the coordinates of the curve coordinate system; reckoning the coefficient of a parabolic equation; converting the vertex of the parabola to the coordinates of the image coordinate system; and establishing a linear equation of the symmetry axis of the measured object; 20, reckoning the principal point coordinates of the image; and 30, measuring the image distortion coefficient: selecting an image point from the measured object, and obtaining two-dimensional coordinates of the image point in the image coordinate system; establishing a distortion coefficient equation; recovering the distortion so that the measured object becomes a line from a curve; giving the normal equation of the measured object; and establishing the normal equation of the measured object and reckoning the distortion coefficient of the image. The measuring method can be used for measuring the image distortion coefficient and principal point coordinates of the imaged picture.

Description

technical field [0001] The invention belongs to the field of image measurement, and in particular relates to a method for measuring principal point coordinates and distortion coefficients of an image image of a linear target. Background technique [0002] The field of computer vision often requires three-dimensional measurement of photographic objects through images. Image distortion has a great influence on the measurement results, and it is required to correct the coordinates of image points by obtaining the distortion coefficient of the image during the measurement process. At present, there are two methods for calculating the image distortion coefficient: one is to calibrate in the laboratory, that is, to use special instruments and equipment in the laboratory for identification and provide it to users; the other is to arrange a certain number of control points within the shooting range before shooting , calculate the distortion coefficient through the mathematical model...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00
Inventor 沙月进翁永玲占小康
Owner SOUTHEAST UNIV
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