Laser Line Detection with Sub-Pixel Accuracy

Molder, A.; Märtens, Olev; Saar, T.; Land, Raul

doi:10.5755/j01.eee.20.5.7114

Cited by 13 publications

(6 citation statements)

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“…In terms of algorithmic development in this field, there are many kinds of research studies on laser line thinning. Molder et al [ 19 ] proposed and studied two laser line center position detection methods, which improved the laser line detection results to sub-pixel accuracy. Natalija et al [ 20 ] proposed a new laser line center estimation algorithm.…”

Section: Related Workmentioning

confidence: 99%

Three-Dimensional Reconstruction with a Laser Line Based on Image In-Painting and Multi-Spectral Photometric Stereo

Zhu

Dong

et al. 2021

Sensors

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This paper presents a multi-spectral photometric stereo (MPS) method based on image in-painting, which can reconstruct the shape using a multi-spectral image with a laser line. One of the difficulties in multi-spectral photometric stereo is to extract the laser line because the required illumination for MPS, e.g., red, green, and blue light, may pollute the laser color. Unlike previous methods, through the improvement of the network proposed by Isola, a Generative Adversarial Network based on image in-painting was proposed, to separate a multi-spectral image with a laser line into a clean laser image and an uncorrupted multi-spectral image without the laser line. Then these results were substituted into the method proposed by Fan to obtain high-precision 3D reconstruction results. To make the proposed method applicable to real-world objects, a rendered image dataset obtained using the rendering models in ShapeNet has been used for training the network. Evaluation using the rendered images and real-world images shows the superiority of the proposed approach over several previous methods.

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Section: Related Workmentioning

confidence: 99%

Three-Dimensional Reconstruction with a Laser Line Based on Image In-Painting and Multi-Spectral Photometric Stereo

Zhu

Dong

et al. 2021

Sensors

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“…The first method with pixel resolution was using a second order Gaussian derivate [11]. The second method used to detect the laser from the chessboard image was the laser line subpixel detection by convolution maximum correction with parabola, as it has been described in the previous work [6].…”

Section: Determining the Laser Light Plane Parameters With Pixelmentioning

confidence: 99%

“…In other cases the one pixel resolution is not sufficient, as the actual laser line center position is located between two pixels and if going into sub-millimeter measurements the accuracy of the laser line detection algorithm significantly influences [6] the real measurement results.…”

Section: Introductionmentioning

confidence: 99%

Laser Scanner Calibration Dependency On the Line Detection Method

Molder

Märtens²,

Saar³

et al. 2015

ElAEE

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Calibration is an important step of 3D structured light laser scanners to be able to obtain an accurate measuring result. During the calibration a relation between the pixels in 3D laser scanner camera image and the real world units is made. Laser line detection method as part of the calibration process plays an important role in this calibration process, but this aspect has not been investigated before. In this paper the calibration and measurement result dependency from the laser line detection with pixel or sub-pixel resolution in the calibration process has been investigated. The calibration process of the developed 3D laser scanner has been described. The results show dependency between the laser line detection method in the calibration process and the final measurement results.

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“…In many cases, when 3-D scanners cannot be used they may be substituted with twodimensional (2-D) scanners or some other methods based on laser beam sensing can be used. 6,7 To create a 3-D model of large-scale outdoor areas, the calculation of points cloud must also include data on a measurement position. Problems of obtaining the accurate position from the global positioning system (GPS) and inertial navigation system (INS) are solved by Gaina and Gaina, 8 Chandra and Rajabi, 9 Jiang et al, 10 Huang et al, 11 Wu et al, 12 and Gu et al 13 To increase the accuracy of such approaches, fusion of data from multiple sensors is used.…”

Section: Introductionmentioning

confidence: 99%

“…In many cases, when 3-D scanners cannot be used they may be substituted with two-dimensional (2-D) scanners or some other methods based on laser beam sensing can be used. 6,7…”

Section: Introductionmentioning

confidence: 99%

Searching for collisions between mobile robot and environment

Hruboš

Svetlík

Nikitin

et al. 2016

International Journal of Advanced Robotic Systems

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This article is focused on the search for potential collision of a moving object (as a mobile robot is) with the environment. Application of the proposed and presented method requires existence of the three-dimensional model of the environmental space. In this case, the models are generated automatically with the help of mobile measurement platform developed by authors and are available to other applications. Models of moving objects are loaded by the proposed application from external files. The method is based on data fusion, using data from a laser scanner, global positioning system, and inertial navigation system; however, it can also be used for data obtained by other ways. Its correctness was experimentally proved by several experimental tests. Output is in the form of calculated coordinates of the point in which a moving object would potentially collide with the environment if no avoiding action is taken. Such an object may represent an oversized load transferred by a truck, train, ship, the transport means itself or even a person.

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Laser Line Detection with Sub-Pixel Accuracy

Cited by 13 publications

References 0 publications

Three-Dimensional Reconstruction with a Laser Line Based on Image In-Painting and Multi-Spectral Photometric Stereo

Three-Dimensional Reconstruction with a Laser Line Based on Image In-Painting and Multi-Spectral Photometric Stereo

Laser Scanner Calibration Dependency On the Line Detection Method

Searching for collisions between mobile robot and environment

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