Shape Measurement by Phase-Stepping Method Using Multi-Line LEDs

Morimoto, Yoshiharu; Masaya, Akihiro; Fujigaki, Motoharu; Asai, Daisuke

doi:10.5772/36127

Cited by 6 publications

(4 citation statements)

References 20 publications

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“…If the light sources are LEDs, it is possible to change quickly the active light source. We call this method a light-source-stepping method (LSSM) [7][8][9]. Figure 5 shows a positional relationship of light source position and projection grating pitch in the LSSM.…”

Section: B Light-source-stepping Methods (Lssm)mentioning

confidence: 99%

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Real-time and wide-range 3D shape measurement using linear LED fringe projector

Fujigaki

2015

2015 2nd International Conference on Opto-Electronics and Applied Optics (IEM OPTRONIX)

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A compact 3D shape measurement device with high accurate and high-speed was proposed by authors. In this paper, a real-time and wide-range 3D shape measurement using the linear LED fringe projector is shown. This projector can switch two pitches quickly. The principle of an algorithm to obtain the 3D point cloud in real-time and wide-range with a whole-space tabulation method is explained. The experimental results of the wide-range shape measurement are shown.

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Section: B Light-source-stepping Methods (Lssm)mentioning

confidence: 99%

“…Authors developed a linear LED projector and proposed a light source stepping method (LSSM) using the linear LED projector [7][8][9]. The shape measurement equipment can be produced with low-cost and compact without any phaseshifting mechanical systems by using this method.…”

Section: Introductionmentioning

confidence: 99%

Real-time and wide-range 3D shape measurement using linear LED fringe projector

Fujigaki

2015

2015 2nd International Conference on Opto-Electronics and Applied Optics (IEM OPTRONIX)

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“…Measuring the distance to the object then depends on taking a picture at a specific focus setting and calculating the distance using the lens equation [6]. Other methods used to measure the distance is photogrammetry [7], [8] and the fringe projection technique [9] - [11]. Areas of application are, however, limited by the scope of the distances, the speed of the autofocus settings, image processing time, the resolution of the camera image sensor, the number of processed frames per second, as well as the dimensions and weight of the sensor.…”

Section: Introductionmentioning

confidence: 99%

Studying the influence of object size on the range of distance measurement in the new Depth From Defocus method

Murawski

Arciuch

Pustelny

2016

Annals of Computer Science and Information Systems

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Abstract-The article presents new results achieved during researching the distance measuring method that is a part of Depth From Defocus techniques. The method has been developed to determine the shape of the flaccid diaphragm used in the Ventricular Assist Device (VAD). The shape is determined on the basis of distance measured between the CCD sensor plate of the camera and objects (markers) located on the flaccid diaphragm. Experiments were carried out using a stationary camera and circular markers with a diameter from 3 mm to 9 mm.The goal of this paper is to present the influence of the object (marker) size on the distance range measured between the camera and diaphragm used in the external pneumatic prosthetic heart.

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“…The distance to the object is then determined with a lens equation [6]. Other methods used to measure the distance are photogrammetry [7][8] and a fringe projection technique [9][10][11]. Their use, however, depends on: the scope of measured distances, required measurement speed, required image sensor resolution, light source type as well as target size and sensor weight.…”

mentioning

confidence: 99%

Study of distance range visual measurement in the new Depth From Defocus method

Murawski

Arciuch

Pustelny

2016

Photon. Lett. Poland

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Abstract-The article presents the results achieved while researching a distance measuring method belonging to Depth From Defocus techniques. The method has been developed to determine the shape of a flaccid diaphragm used in the Ventricular Assist Device (VAD). The shape is determined on the basis of distance measured between the CCD sensor plate of a camera and the markers located on the flaccid diaphragm. The goal of this paper is to present the influence of marker size on distance range measured between the camera and the diaphragm used in a pneumatic prosthetic heart.The article presents the impact of marker size on the result of a distance measurement method [1,2]. The method was developed for a video sensor to determine the instantaneous stroke volume of blood SV from a pneumatic pump heart assist device (VAD), Fig. 1a. When measuring SV, the flaccid diaphragm is equipped with markers which position and orientation in 3D space is subject to change in relation to the camera position. What is important in the method is that when measuring the position of the camera and all settings: the lens and the camera (focus, aperture, focal length) are invariable. Method [1, 2] also defines in 3D space the position of all the markers on the basis of analysis of only one image frame. In this respect, it has no equivalent in the literature. The vision systems mentioned in the literature typically create a stereoscopic system [3]. The distance in such a system is calculated knowing the optical parameters of the cameras and their mutual position. Measuring systems equipped with one camera are also used [4]. The distance to the object in these systems is determined using, for example, a perspective inverse transform [5]. A single camera configuration with an autofocus function is also possible. The distance to the object is then determined with a lens equation [6]. Other methods used to measure the distance are photogrammetry [7][8] and a fringe projection technique [9][10][11]. Their use, however, depends on: the scope of measured distances, required measurement speed, required image sensor resolution, light source type as well as target size and sensor weight.When determining the shape of a flaccid diaphragm, real time operation is particularly important (the shape of the diaphragm may change with a frequency of up to 3Hz) as * E-mail: Krzysztof.Murawski@wat.edu.pl well as simultaneous multipoint measurement of the position in 3D space in respect to all of the markers, Fig. 1b. The development of a soft-sensor for measuring the SV of a pulsating heart assist pump results from the needs and problems mentioned in [12]. In [12][13] it was demonstrated that SV can be determined by using the acoustic Helmholtz resonator theory. This method, however, has substantial limitations. For this reason the search for techniques of determining SV is still valid. The knowledge of changes dynamics in SV will enhance the safety of VAD usage, which currently depends on visual inspection: "One of the main advantages of the extracorporeal, po...

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Shape Measurement by Phase-Stepping Method Using Multi-Line LEDs

Cited by 6 publications

References 20 publications

Real-time and wide-range 3D shape measurement using linear LED fringe projector

Real-time and wide-range 3D shape measurement using linear LED fringe projector

Studying the influence of object size on the range of distance measurement in the new Depth From Defocus method

Study of distance range visual measurement in the new Depth From Defocus method

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