Research on 3D reconstruction technology based on laser measurement

Liu, Lei; Cai, Haidong; Tian, Min; Liu, Dandan; Yong, Cheng; Yin, Wei

doi:10.1007/s40430-023-04231-9

Cited by 7 publications

(2 citation statements)

References 24 publications

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“…Among many measurement methods for 3D reconstruction, laser measurement, as a non-contact measurement, does not damage the measured object and has high measurement accuracy and speed [14]. C. Lizcano et al [15] proposed a 3D surface reconstruction method based on triangulation, which can generate 3D surfaces.…”

Section: Introductionmentioning

confidence: 99%

A Method for Extracting a Laser Center Line Based on an Improved Grayscale Center of Gravity Method: Application on the 3D Reconstruction of Battery Film Defects

Yao,

Wang,

et al. 2023

Applied Sciences

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Extraction of the laser fringe center line is a key step in the 3D reconstruction of linear structured light, the accuracy of which is directly related to the quality of the 3D model. A laser center line extraction method based on an improved gray center of gravity method is proposed to solve the problem of low extraction accuracy. Firstly, a smoothing method is used to eliminate the flat top of the laser line, and the Gaussian curve is adopted to fit the peak position of the curve. Then, the gray threshold is set to automatically extract the laser linewidth, and based on the window opening, the grayscale center of gravity method is improved to extract the coordinates of the center pixel for the second time. Finally, experiments show that the average absolute error of the improved laser line extraction method is 0.026 pixels, which is 2.3 times lower than the gray center of gravity method, 1.9 times lower than the curve fitting method, and the standard error can reach 0.005 pixels. Compared with the gray center of gravity method and the curve fitting method, the influence of gray value change on the center line extraction is more fully considered, and the center of the light strip can be extracted more accurately, achieving sub-pixel accuracy.

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Section: Introductionmentioning

confidence: 99%

A Method for Extracting a Laser Center Line Based on an Improved Grayscale Center of Gravity Method: Application on the 3D Reconstruction of Battery Film Defects

Yao,

Wang,

et al. 2023

Applied Sciences

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“…Although this method still needs improvement in areas such as image matching and 3D reconstruction, with advancements in image acquisition hardware devices and ongoing research in image processing algorithms, it is expected that this method will become the mainstream approach for volume measurement in the future. Structured light measurements [19][20][21] involve scanning the object using structured light and utilizing image reconstruction for 3D volume measurements. Depending on the type of structured light used, these measurements can be categorized into line structured light measurements [22,23] and planar structured light measurements [24,25].…”

Section: Introductionmentioning

confidence: 99%

Study on the Measurement Method of Wheat Volume Based on Binocular Structured Light

Zhao,

Chang,

2023

Sustainability

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In this paper, we propose a grain volume measurement method based on binocular structured light to address the need for fast and high-precision grain volume measurement in grain stocks. Firstly, we utilize speckle structured light imaging to tackle the image matching problem caused by non-uniform illumination in the grain depot environment and the similar texture of the grain pile surface. Secondly, we employ a semi-global stereo matching algorithm with census transformation to obtain disparity maps in grain bins, which are then converted into depth maps using the triangulation principle. Subsequently, each pixel in the depth map is transformed from camera coordinates to world coordinates using the internal and external parameter information of the camera. This allows us to construct 3D cloud data of the grain pile, including the grain warehouse scene. Thirdly, the improved European clustering method is used to achieve the segmentation of the three-dimensional point cloud data of the grain pile and the scene of the grain depot, and the pass-through filtering method is used to eliminate some outliers and poor segmentation points generated by segmentation to obtain more accurate three-dimensional point cloud data of the grain pile. Finally, the improved Delaunay triangulation method was used to construct the optimal topology of the grain surface continuous triangular mesh, and the nodes of the grain surface triangular mesh were projected vertically to the bottom of the grain warehouse to form several irregular triangular prisms; then, the cut and complement method was used to convert these non-plane triangular prisms into regular triangular prisms that could directly calculate the volume. The measured volume of the pile is then obtained by calculating the volume of the triangular prism. The experimental results indicate that the measured volume has a relative error of less than 1.5% and an average relative error of less than 0.5%. By selecting an appropriate threshold, the relative standard deviation can be maintained within 0.6%. The test results obtained from the laboratory test platform meet the requirements for field inspection of the granary.

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Application of 3D scanning and computer simulation techniques to assess the shape accuracy of welded components

Jędrych,

Gorzkiewicz,

Deja

et al. 2024

Int J Adv Manuf Technol

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While traditional measurement methods prove to be insufficient when facing more complex shapes and intricate challenges, increasingly efficient solutions are emerging in their place. 3D scanners in particular exhibit versatility. They clearly represent a useful tool in many fields with diverse requirements; thus, it is advisable to explore further areas of their potential applications, e.g., in quality control or reverse engineering. During our research, measurements were carried out on 40 welded elements using a caliper and on 11 other elements using the HandySCAN 700 Elite device by Creaform. The research was conducted at different stages of production, between subsequent operations. In addition, in the absence of interoperative nominal dimensions, a welding process simulation was performed in the Simufact Welding software. The simulation results were compared with actual deformations measured using a 3D scanner. The research enabled identification of the causes of excessive deformations and provided the basis for comparing the caliper with a modern laser device. A particular advantage of the scanner was demonstrated for complex issues requiring high flexibility and precise documentation of full geometry. The caliper proved to be more efficient only for quick execution of single, simple measurements at specific places. Incorporating the simulation in the Simufact Welding software into the analysis, allowed for a more precise validation of the planned technology. This solution presents a promising alternative to nominal models, particularly valuable when measurements are conducted between subsequent operations. Further research in this area is also recommended to enhance proposed methodology.

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Research on 3D reconstruction technology based on laser measurement

Cited by 7 publications

References 24 publications

A Method for Extracting a Laser Center Line Based on an Improved Grayscale Center of Gravity Method: Application on the 3D Reconstruction of Battery Film Defects

A Method for Extracting a Laser Center Line Based on an Improved Grayscale Center of Gravity Method: Application on the 3D Reconstruction of Battery Film Defects

Study on the Measurement Method of Wheat Volume Based on Binocular Structured Light

Application of 3D scanning and computer simulation techniques to assess the shape accuracy of welded components

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