A simple calibration procedure for structured light system

Luo, Huafen; Xu, Jing; Binh, Nguyen Hoa; Liu, Shuntao; Zhang, Chi; Chen, Ken

doi:10.1016/j.optlaseng.2014.01.010

Cited by 48 publications

(14 citation statements)

References 31 publications

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“…The coverage in the vertical dimension of the camera ( ) has to be projected on the part to have actual coverage of the part in the Y ( ) and Z ( ) axes (16)(17)(18)(19)(20):…”

Section: Basic Designmentioning

confidence: 99%

“…In this respect, Smith and Zheng [17] presented a modelling technique to simulate the effect of different factors, including incident angle and surface reflectivity, on accuracy. In addition, optical distortion significantly affects the results [18][19][20], and is relevant for short focal distance optics. Thus, all these effects are considered as a source of uncertainty [21].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Simulation of Laser Triangulation Sensors Scanning for Design and Evaluation Purposes

Cajal¹,

Santolaria²,

Samper³

2015

Int. j. simul. model.

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Nowadays, computerized dimensional inspection is included in most manufacturing processes. Industrial vision systems, laser triangulation sensors (LTS) in particular, are responsible for ensuring dimensional and geometrical tolerance compliance. Computer-aided design / computer-aided engineering (CAD/CAE) plays an important role in the manufacturing process. However, in the design and engineering of LTS, there is no equivalent computer-aided tool to provide assistance to the process definition. This paper presents a simulation environment to assist with this issue. Based on the CAD files of the parts, all the parameters of an LTS sensor and its scanning strategy can be simulated in a virtual Direct3D environment. This simulation provides a re-creation of the camera acquisition, allowing collision and occlusion detection and ensures complete and effective digitalization. Furthermore, the capability of the process of tolerance compliance evaluation can be verified. Once the effectiveness of the process is proven, the simulation can be employed for continuous performance improvement and the incorporation of new parts.

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“…The coverage in the vertical dimension of the camera ( ) has to be projected on the part to have actual coverage of the part in the Y ( ) and Z ( ) axes (16)(17)(18)(19)(20):…”

Section: Basic Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simulation of Laser Triangulation Sensors Scanning for Design and Evaluation Purposes

Cajal¹,

Santolaria²,

Samper³

2015

Int. j. simul. model.

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show abstract

“…Detection of the defects in polymer films by non-destructive methods is of great interest [6][7][8][9]. Systems capable to detect defects are used in the laboratories, on the production lines and on the final product inspection stations.…”

Section: Introductionmentioning

confidence: 99%

Detection of the surface defects in thin polymeric films using projection moiré

Miliūnas¹,

Voloshin²,

Kibirkštis³

et al. 2017

J. meas. eng.

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Experimental investigations of the polymeric films HDPE and PP and of the multi-layered material PET+LDPE with defects (puckered surfaces, holes and segregation of the upper layer) were performed. For this purpose, the method of projection moiré was used. In the process of investigations, the images of the defects were determined. During the experimental investigations it was determined that the images and shapes of the eigenmodes, as well as the frequencies and amplitudes of vibrations change due to mechanical or structural defects in the polymeric films and because of symmetrical or un-symmetrical loading. Typical optical images for various types of defects were determined. In the paper smoothness of fringes by using the method of time averaged geometric moiré is also investigated. On the basis of a one dimensional model graphical relationships for linear variation with respect to longitudinal coordinate of amplitude of vibrations are obtained. They provide the background for the choice of the required number of images in a period of oscillations for different smoothnesses of moiré fringes.

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“…Such methods are therefore less likely to be portable when applied to systems employing different hardware components. Additionally, the existence of a projector complicates the analytical model and some authors have attempted to exclude it to simplify the analytical calibration process [8].…”

Section: Introductionmentioning

confidence: 99%

Simple and accurate empirical absolute volume calibration of a multi-sensor fringe projection system

Gdeisat

Qudeisat

AlSa׳d

et al. 2016

Optics and Lasers in Engineering

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This paper suggests a novel absolute empirical calibration method for a multi-sensor fringe projection system. The optical setup of the projector-camera sensor can be arbitrary. The term absolute calibration here means that the centre of the three dimensional coordinates in the resultant calibrated volume coincides with a preset centre to the three-dimensional real-world coordinate system. The use of a zero-phase fringe marking spot is proposed to increase depth calibration accuracy, where the spot centre is determined with sub-pixel accuracy. Also, a new method is proposed for transversal calibration. Depth and transversal calibration methods have been tested using both single sensor and three-sensor fringe projection systems. The standard deviation of the error produced by this system is 0.25 mm. The calibrated volume produced by this method is 400 mm × 400 mm × 140 mm.

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A simple calibration procedure for structured light system

Cited by 48 publications

References 31 publications

Simulation of Laser Triangulation Sensors Scanning for Design and Evaluation Purposes

Simulation of Laser Triangulation Sensors Scanning for Design and Evaluation Purposes

Detection of the surface defects in thin polymeric films using projection moiré

Simple and accurate empirical absolute volume calibration of a multi-sensor fringe projection system

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