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Feature extraction method of laser engraved line based on line laser

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: 2020-04-07
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • Feature extraction method of laser engraved line based on line laser
  • Feature extraction method of laser engraved line based on line laser
  • Feature extraction method of laser engraved line based on line laser

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 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.

[0049] 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...

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Abstract

The invention relates to a line laser-based laser profiling line feature extraction method, which belongs to the technical field of laser measurement and relates to a line laser-based laser profiling line feature extraction method. This method is aimed at the line laser detection of the laser profiling processing position in the chemical milling area of ​​large-scale aviation panel parts, and performs data preprocessing on the acquired original signal based on median filtering and wavelet threshold denoising to obtain a smooth and stable signal. Adaptive curve fitting is used to restore the accurate shape of the line laser position workpiece conformal curve and the engraved groove curve; the obtained workpiece conformal curve and the engraved groove curve equation are used to determine the boundary feature points on the upper edge of the groove, and the centering method is adopted. Accurate feature points of grooves are obtained by means of averaging. This method has high robustness, the feature points of the extracted profiling lines are located accurately, and the final fitted profiling line contour curve also meets the requirements of comparison with the digital model, which is of great significance for guiding the processing and assembly of workpieces. significance.

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

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Application Information

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Patent Type & Authority Patents(China)
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
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