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Circle center sub-pixel precision positioning method

A positioning method and sub-pixel technology, applied in image analysis, image data processing, instruments, etc., can solve problems such as long running time, complex algorithm process, and large amount of calculation, so as to improve calculation efficiency and algorithm stability, and improve calculation efficiency effect

Active Publication Date: 2019-12-31
GUANGDONG AOPUTE TECH CO LTD
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Problems solved by technology

[0003] The existing sub-pixel precision positioning method is generally based on the initial center of the dot, and obtains the sub-pixel precision edge point of the current dot through Canny edge detection, and then performs equal-weight ellipse center fitting. Level edge detection, the algorithm process is complex, the amount of calculation is large, resulting in a long running time

Method used

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  • Circle center sub-pixel precision positioning method
  • Circle center sub-pixel precision positioning method
  • Circle center sub-pixel precision positioning method

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Embodiment

[0029] Such as figure 1 As shown, a sub-pixel precision positioning method for the center of a circle includes the following steps:

[0030] Step 1. Perform image binarization and Blob screening on the grayscale image to obtain the initial center coordinates of the dots in the image;

[0031] Step 2. Assuming the initial center coordinate C0 of one of the dots, set a sampling side length n, take C0 as the center to obtain an nxn sample image from the image, and ensure that the current dot is completely contained in the sampling image and does not contain other dots;

[0032] Step 3. For each pixel in the sampled image, use the Sobel operator in the X and Y directions to obtain the gradient Gx of the current pixel in the X direction and the gradient Gy in the Y direction, then the gray gradient amplitude of the current pixel The value G is:

[0033]

[0034] Step 4. Set a gradient amplitude threshold Gt. For each pixel in the sampled image, the pixel coordinates whose gra...

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Abstract

The invention belongs to the technical field of industrial camera calibration, and particularly relates to a circle center sub-pixel precision positioning method, which comprises the following steps of S1, performing image binaryzation and Blob screening on a solid dot calibration plate gray scale image to obtain initial center coordinates of dots in the image; and S2, assuming an initial center coordinate C0 of one dot, setting a sampling side length n, and acquiring a sampling image with the size of n * n from the calibration plate image by taking C0 as the center to ensure that the currentdot is completely contained in the sampling image and does not contain other dots. A Sobel operator is utilized to obtain a gray scale gradient near the edge of a dot as a weight, and pixel-level edgepoints are combined to carry out weighted ellipse center fitting, so that the step of sub-pixel-level edge detection is omitted, and the operation efficiency and the algorithm stability are improved.

Description

technical field [0001] The invention belongs to the technical field of industrial camera calibration, and in particular relates to a sub-pixel precision positioning method for a circle center. Background technique [0002] In the process of industrial camera calibration, the solid dot array pattern plate is often used as the calibration plate. Multiple calibration plate images are taken by the industrial camera, and the camera model parameters are calibrated by using the image coordinates and world coordinates of the solid dots. The solid dots in the image The positioning accuracy directly affects the final calibration effect. In the calibration process, the calibration image is usually binarized first, and the initial center of the dot is obtained through Blob screening. In order to obtain higher-precision positioning coordinates of the dot, it is often necessary to perform sub-pixel precision positioning on the center of each dot. . [0003] The existing sub-pixel precis...

Claims

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Application Information

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IPC IPC(8): G06T7/13G06T7/80
CPCG06T7/13G06T7/80
Inventor 叶景杨曹玲卢盛林
Owner GUANGDONG AOPUTE TECH CO LTD
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