Line laser based laser engraving line feature extraction method

An extraction method, line laser technology, applied in the field of laser measurement, can solve limitations and other problems, and achieve the effect of accurate feature point position and high robustness

Inactive Publication Date: 2017-09-05
DALIAN UNIV OF TECH
View PDF5 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is limited to the extraction of straight line features, and it is impossible to perform general feature extraction on laser engraved lines with both curves and straight lines.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Line laser based laser engraving line feature extraction method
  • Line laser based laser engraving line feature extraction method
  • Line laser based laser engraving line feature extraction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Embodiment 1, the tested object of the present invention is a 600*800mm aluminum sample plate with a flatness of 0.01mm. It has the engraved line boundary left after chemical milling and cutting, and the laser is projected on the surface of the part. Through the KEYNECE laser sensor and its blue laser, the original signal data is obtained and processed as the original noise-containing signal. The obtained original noisy signal is attached as figure 2 shown. then follow the attached figure 1 The flow chart shown proceeds as follows.

[0051] The first step is signal preprocessing based on median filtering and wavelet threshold denoising. Median filtering is performed on the original noisy data signal. First define a long sliding window. If the signal sample value in the window at a certain moment is {x(i-N),...,x(i),...,x(i+N)}. The signal values ​​in the window are sorted from small to large, and the median value is taken as the output value of the filter, which...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention belongs to the technical field of laser measurement, and relates to a line laser based laser engraving line feature extraction method. The method is provided in allusion to line laser detection for the laser engraving machining position of chemical milling regions of large aviation wall plate parts, and data preprocessing is performed on acquired original signals based on median filtering and wavelet threshold denoising so as to acquire smooth and stable signals. The accurate shape of a workpiece shape follow-up curve and an engraving groove curve at the line laser position is restored by adopting adaptive curve fitting; determining top edge boundary feature points of a groove according to an acquired workpiece shape follow-up curve equation and an engraving groove curve equation, and acquiring an accurate feature point of the groove by adopting a centering and averaging mode. The method has very high robustness, the extracted feature point of an engraving line is accurate in position, and a finally fit engraving line profile curve also meet a requirement of performing comparison with a mathematical model, thereby having great significance for guiding workpiece machining and assembling.

Description

technical field [0001] The invention belongs to the technical field of laser measurement, and relates to a method for extracting features of laser profiling lines based on line lasers. Background technique [0002] In the aircraft manufacturing process, it is necessary to carry out laser engraving processing on the chemical milling area of ​​large-scale aviation panel parts, and then make it meet the specified technical and precision requirements to meet its high-quality connection assembly requirements. At the same time, through the laser sensor, based on the line laser, the feature points of the laser engraved line are extracted, and the accurate shape of the line laser position workpiece conformal curve and engraved groove curve is restored; through the obtained workpiece conformal curve and engraved groove curve equation Determine the feature points along the edge of the groove, and obtain the precise feature points of the groove by means of centering and averaging, whic...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G06K9/00G06T7/13G06T11/20B23K26/362
CPCG06T7/13G06T11/203B23K26/361G06T2207/30108G06T2207/20032G06F2218/06G06F2218/04
Inventor 刘巍张致远张洋赵海洋叶帆兰志广马建伟贾振元
Owner DALIAN UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap