Accurate measurement positioning method based on calibration algorithm

A positioning method and precise measurement technology, applied in measurement devices, calculations, image data processing, etc., can solve the problems of high requirements for external factors, low measurement accuracy, and high cost, avoiding cumbersome processes, avoiding low precision, The effect of high machining accuracy

Pending Publication Date: 2021-05-07
YUNNAN ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI +1
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Problems solved by technology

For example, in the field of industrial measurement and positioning, accurate manual measurement is required to obtain actual parameters such as the length, width, and height of objects. The implementation of this online measurement method is cumbersome. For some large or small equipment that is difficult to measure or requires high precision It is difficult to obtain the precise parameters of the object through direct measurement
At present, there are many off-line measurement methods commonly used, such as microscope confocal scanning and other methods for measuring precision objects. Although this method has high precision, most of the precision processing of objects requires coaxial measurement, and it is difficult for the processing platform and the microscope to perform simultaneous measurement. The axis is measured and processed at the same time, and the method of coaxial measurement has high requirements on hardware equipment and external conditions. It is necessary to accurately calibrate and match the processing platform and the object to be processed, and each time the processing pla

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  • Accurate measurement positioning method based on calibration algorithm
  • Accurate measurement positioning method based on calibration algorithm
  • Accurate measurement positioning method based on calibration algorithm

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[0035]In order to deepen the understanding of the present invention, the present invention will be further detailed in connection with the present invention, and the present embodiment is intended to be construed as limiting the scope of the invention.

[0036]according tofigure 1 As shown, this embodiment provides an accurate measurement positioning method based on the calibration algorithm, including the following steps:

[0037]Step 1: Get the captured image angular sub-pixel coordinate, use focal length fixed camera to transform any position of the known dimensional parameters, the plurality of shots of the posture to acquire the image, convert the image to a grayscale map , Grayscale after the above treatmentFigure II After the value, the angular point detection algorithm determines whether or not there is angular point. If there is an angular point, the precision sub-pixel coordinate of the angle point is obtained;

[0038]Step 2: The acquisition of the parameters in the camera device,...

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Abstract

The invention discloses an accurate measurement positioning method based on a calibration algorithm, and the method comprises the steps: carrying out the conversion of any position and posture of a checkerboard calibration plate through a camera with a determined focal length, obtaining a plurality of images, converting the images into gray-scale images, carrying out the binarization processing, obtaining the angular points of the checkerboard calibration plate on the images, acquiring accurate sub-pixel coordinates of angular points of a checkerboard calibration plate of an image, calculating internal parameters of camera equipment for shooting a picture, acquiring external parameters such as rotation and translation matrixes of the camera equipment for shooting through a multi-point positioning method, and calculating and obtaining accurate positions of expected positioning points on the picture and world coordinate points corresponding to the expected positioning points. According to the method, the relative position of the real space corresponding to any pixel point on the image shot by the camera in any pose state can be obtained, accurate target position positioning is a very important link in precise instrument processing and daily measurement calculation, and improvement of the positioning and measurement precision and speed is a target and direction which are always effort in the industry.

Description

technical field [0001] The invention relates to the field of laser precision machining, in particular to an accurate measurement and positioning method based on a calibration algorithm. Background technique [0002] In the field of traditional image processing, it is very important to restore the precise position of the object itself through the image. For example, in the field of industrial measurement and positioning, accurate manual measurement is required to obtain actual parameters such as the length, width, and height of objects. The implementation of this online measurement method is cumbersome. For some large or small equipment that is difficult to measure or requires high precision It is difficult to obtain accurate parameters of objects through direct measurement. At present, there are many off-line measurement methods commonly used, such as microscope confocal scanning and other methods for measuring precision objects. Although this method has high precision, mos...

Claims

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Application Information

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IPC IPC(8): G06T7/80G06T7/13G06T5/00G01B11/00
CPCG06T7/80G06T7/13G06T5/006G01B11/00G06T2207/20164
Inventor 翟顺诚伦宝利龙潜张晓世李捷李逵
Owner YUNNAN ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI
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