Focal length measuring method for laser marking machine

A technology of laser marking machine and measurement method, which is applied in the focal length measurement of laser marking machine based on the superpixel grid motion statistical feature matching algorithm, and in the field of focal length measurement of laser marking machine, which can solve the problem that the distance measurement method cannot meet the actual needs, etc. problems, to achieve the effect of real-time measurement output, good ranging accuracy and efficiency improvement

Pending Publication Date: 2022-03-15
HARBIN ENG UNIV
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Problems solved by technology

At this stage, the requirements for focusing speed and marking accuracy of laser marking machines are increasing day by day, and the existing ranging methods cannot meet the actual needs

Method used

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  • Focal length measuring method for laser marking machine
  • Focal length measuring method for laser marking machine
  • Focal length measuring method for laser marking machine

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Embodiment Construction

[0053] The present invention will be further described below in conjunction with the accompanying drawings and embodiments of the description.

[0054] The hardware experiment platform of the present invention includes a laser marking machine, a true-color binocular camera and a computer. The software experiment program includes the following four parts: binocular camera parameter determination, binocular image superpixel segmentation, feature point matching, and feature point pair output disparity. The measurement of the binocular camera parameters is to obtain the baseline and focal length parameters of the binocular camera; the super pixel segmentation of the binocular image is to use the SLIC super pixel segmentation method to perform super pixel segmentation on the left and right images respectively; The binocular image uses a feature matching algorithm based on superpixel grid motion statistics for feature point matching; the output disparity of feature point pairs is de...

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Abstract

The invention discloses a focal length measurement method for a laser marking machine. The method comprises the following steps: S1, carrying out left and right camera image acquisition on a target object by using a binocular camera; s2, after the camera is calibrated, camera focal length and baseline parameters are obtained; s3, segmenting the acquired image into super-pixel regions by adopting a super-pixel segmentation method; s4, carrying out feature point matching by adopting superpixel grid motion statistics; and S5, respectively calculating disparity maps of the matched feature points, averaging to obtain an average disparity, and finally calculating to obtain a depth map. According to the invention, both the distance measuring precision and the efficiency are obviously improved, and the actual requirements of the laser marking machine can be better met. According to the invention, the effect of real-time measurement output can be realized, and a solution can be provided for streamlined marking operation of the laser marking machine.

Description

technical field [0001] The invention belongs to the field of laser marking, and relates to a method for measuring the focal length of a laser marking machine, in particular to a method for measuring the focal length of a laser marking machine based on a superpixel grid motion statistical feature matching algorithm. Background technique [0002] Laser marking machine is to use laser beam to make permanent marks on the surface of various materials. The marking method is to expose the deep material through the evaporation of the surface material, so as to carve exquisite patterns, trademarks and characters. At this stage, the focal length measurement methods of laser marking machines are lacking, which affects the marking accuracy and marking efficiency. In order to achieve accurate distance measurement, various distance measurement methods have been proposed: Chinese patent CN111780715A discloses a visual distance measurement method, which creates a camera feature database, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00G06T7/11G06T7/80G06V10/44G06V10/74G06V10/762G06K9/62
CPCG06T7/0004G06T7/11G06T7/80G06T2207/10004G06T2207/30108G06F18/23
Inventor 孙晶华吴婧雯刘晓瑜王锋张晓峻
Owner HARBIN ENG UNIV
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