Three-Dimensional Stereo Reconstruction and Sensor Registration With Application to the Development of a Multi-Sensor Database

2002 ◽  
Author(s):  
William F. Oberle ◽  
Gary A. Haas
Keyword(s):  
Three Dimensional ◽  
Stereo Reconstruction ◽  
Sensor Registration

scholarly journals Microscopic Three-Dimensional Measurement Based on Telecentric Stereo and Speckle Projection Methods

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3882 ◽  
Author(s):  
Kepeng Chen ◽  
Tielin Shi ◽  
Qiang Liu ◽  
Zirong Tang ◽  
Guanglan Liao
Keyword(s):  
Measurement Accuracy ◽  
Three Dimensional ◽  
Projection Methods ◽  
Reconstruction Procedure ◽  
Cylinder Arrays ◽  
Stereo Reconstruction ◽  
Three Dimensional Measurement ◽  
Binocular Stereo ◽  
3D Information ◽  
Microscopic Measurement

Three-dimensional (3D) measurement of microstructures has become increasingly important, and many microscopic measurement methods have been developed. For the dimension in several millimeters together with the accuracy at sub-pixel or sub-micron level, there is almost no effective measurement method now. Here we present a method combining the microscopic stereo measurement with the digital speckle projection. A microscopy experimental setup mainly composed of two telecentric cameras and an industrial projection module is established and a telecentric binocular stereo reconstruction procedure is carried out. The measurement accuracy has firstly been verified by performing 3D measurements of grid arrays at different locations and cylinder arrays with different height differences. Then two Mitutoyo step masters have been used for further verification. The experimental results show that the proposed method can obtain 3D information of the microstructure with a sub-pixel and even sub-micron measuring accuracy in millimeter scale.

Research on Measurement Method of Joint Angle for Underwater Manipulator

2014 ◽  
Vol 1039 ◽  
pp. 256-261
Author(s):  
Ding Hao Feng ◽  
Xi Zhang ◽  
Xu Zhang ◽  
Wei Qing Chu
Keyword(s):  
Measurement Method ◽  
Joint Angle ◽  
Vision System ◽  
Three Dimensional ◽  
Angle Measurement ◽  
Robot Arm ◽  
Circle Fitting ◽  
Fitting Algorithm ◽  
Stereo Reconstruction ◽  
Underwater Manipulator

Measurement method of joint angle for underwater manipulator is studied in this paper. The swing of a manipulator can be described as a circular motion in spatial. Therefore this paper proposes a spatial circle fitting algorithm. The points for spatial circle fitting come from multiple stereo vision system. At first, attach the designed target to the robot arm, then proposes algorithm to track the target in real time. Then three-dimensional coordinates of target’s movement in space at each location can be obtained by using stereo reconstruction techniques. At last, the center and radius of the circle can be calculated by spatial circle fitting. Through the theory of analytic geometry, the manipulator’s joint angle can be calculated. Experiments show that the algorithm proposed in this paper is well used in manipulator’s joint angle measurement.

scholarly journals A Low-Cost Stereo Video System for Measuring Directional Wind Waves

2020 ◽  
Vol 8 (11) ◽  
pp. 831
Author(s):  
Matheus Vieira ◽  
Pedro Veras Guimarães ◽  
Nelson Violante-Carvalho ◽  
Alvise Benetazzo ◽  
Filippo Bergamasco ◽  
...  
Keyword(s):  
Low Cost ◽  
Wind Waves ◽  
Three Dimensional ◽  
Battery Life ◽  
Frame Synchronization ◽  
Peak Period ◽  
Directional Spectrum ◽  
Main Requirement ◽  
Stereo Reconstruction ◽  
Time Lagged

Typical oceanographic instruments are expensive, complex to build, and hard to deploy and require constant and specialized maintenance. In this paper, we present a cheap and simple technique to estimate a three-dimensional surface elevation map, η(x,y,t), the directional spectrum, and the main sea state parameters using inexpensive smartphones. The proposed methodology uses Time Lagged Cross Correlation (TLCC) between the audio signals from two independent video records to perform the frame synchronization. This makes the system much easier to deploy, where the main requirement is a fixed or moving platform close to the sea. The time records are mostly limited by the equipment storage space and battery life, although it can be easily replaced or recharged. Here, we pose the basis for an inexpensive yet powerful stereo reconstruction device and discuss its capabilities and limitations. The smartphone system capabilities were illustrated here by near shore experiment, at Leme beach in the Southeast of Brazil, and the results were compared against a pressure sensor. For this particular setup, the root mean square error in terms of significant wave height is of the order of 11% with perfect estimation of the peak period. The results are promising and demonstrate the validity and applicability of the technique.

scholarly journals Three-Dimensional Reconstruction of Indoor and Outdoor Environments Using a Stereo Catadioptric System

2020 ◽  
Vol 10 (24) ◽  
pp. 8851
Author(s):  
Diana-Margarita Córdova-Esparza ◽  
Juan Terven ◽  
Julio-Alejandro Romero-González ◽  
Alfonso Ramírez-Pedraza
Keyword(s):  
Feature Matching ◽  
Three Dimensional ◽  
Ccd Camera ◽  
Outdoor Environments ◽  
Stereo Reconstruction ◽  
Dimensional Reconstruction ◽  
In The Wild ◽  
Epipolar Constraints ◽  
Indoor And Outdoor Environments ◽  
Indoor And Outdoor

In this work, we present a panoramic 3D stereo reconstruction system composed of two catadioptric cameras. Each one consists of a CCD camera and a parabolic convex mirror that allows the acquisition of catadioptric images. We describe the calibration approach and propose the improvement of existing deep feature matching methods with epipolar constraints. We show that the improved matching algorithm covers more of the scene than classic feature detectors, yielding broader and denser reconstructions for outdoor environments. Our system can also generate accurate measurements in the wild without large amounts of data used in deep learning-based systems. We demonstrate the system’s feasibility and effectiveness as a practical stereo sensor with real experiments in indoor and outdoor environments.

Three-dimensional stereo reconstruction of a mass of radioactive coils after embolization of cerebral aneurysms

2004 ◽  
Author(s):  
Alain Gravel ◽  
Jean Raymond ◽  
Benoit Godbout ◽  
Michel Daronat ◽  
Philippe Leblanc ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Cerebral Aneurysms ◽  
Stereo Reconstruction

The orbit of Pluto over a long interval of time

1966 ◽  
Vol 25 ◽  
pp. 227-229 ◽  
Author(s):  
D. Brouwer
Keyword(s):  
Periodic Orbit ◽  
Numerical Integration ◽  
Restricted Problem ◽  
Three Dimensional ◽  
The Third ◽  
Circular Restricted Problem ◽  
Resonance Relation

The paper presents a summary of the results obtained by C. J. Cohen and E. C. Hubbard, who established by numerical integration that a resonance relation exists between the orbits of Neptune and Pluto. The problem may be explored further by approximating the motion of Pluto by that of a particle with negligible mass in the three-dimensional (circular) restricted problem. The mass of Pluto and the eccentricity of Neptune's orbit are ignored in this approximation. Significant features of the problem appear to be the presence of two critical arguments and the possibility that the orbit may be related to a periodic orbit of the third kind.

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