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  • 1
    Electronic Resource
    Electronic Resource
    A New Algorithm with Distance Constraint for Large-Scale Profile Measurement (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 159-162 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.159.pdf
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A Point Matching Method for Stereovision Measurement (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 381-382 (June 2008), p. 305-308 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Many vision tasks such as 3D measurement, scene reconstruction, object recognition, etc.,rely on feature correspondence among images. This paper presents a point matching method for 3Dsurface measurement. The procedure of the method is as follows: (1) rectification for stereo imagepairs; (2) computation of epipolar lines; (3) sequential matching in vertical direction; (4) sequentialmatching in horizontal direction. The fourth step is performed to deal with the ambiguity in denseareas where points have closer vertical coordinates. In the fourth step a threshold limit of verticalcoordinate difference is designed to determine those points potential to cause ambiguity. This methodwas applied to the 3D surface measurement for an inflatable parabolic reflector with validity of pointmatching up to 100%. Experiment results show that this method is feasible in application of sparsepoint matching for continuous surface measurements
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.381-382.305.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Photogrammetric Method with Distance Constraint for Profile of Inflatable Space Antenna (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 381-382 (June 2008), p. 313-316 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The inflatable space antenna is gradually used in various spacecrafts because it is portableand foldaway. It is usually made of thin-film materials and has a flexible surface, so that measuringforce is not tolerable in measurement process. Close-range photogrammetry is considered as anoptimal solution because of its advantages of non-contact operation and fast data acquisition. Toimprove measuring precision, a method combining bundle adjustment algorithm and the distanceconstraint is presented in the paper. Two experiments under different conditions are accomplishedand experiment results are compared. One experiment is completed with the distance constraint andanother without. The experiment results are compared by two parameters: tightness and residuals. Themeasured object is an inflatable antenna with a 3.5-m diameter
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.381-382.313.pdf
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  • 4
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    Simultaneous All-Parameters Calibration and Assessment of a Stereo Camera Pair Using a Scale Bar (2018)
    Molecular Diversity Preservation International
    Details
    Publication Date: 2018-11-15
    Description: Highly accurate and easy-to-operate calibration (to determine the interior and distortion parameters) and orientation (to determine the exterior parameters) methods for cameras in large volume is a very important topic for expanding the application scope of 3D vision and photogrammetry techniques. This paper proposes a method for simultaneously calibrating, orienting and assessing multi-camera 3D measurement systems in large measurement volume scenarios. The primary idea is building 3D point and length arrays by moving a scale bar in the measurement volume and then conducting a self-calibrating bundle adjustment that involves all the image points and lengths of both cameras. Relative exterior parameters between the camera pair are estimated by the five point relative orientation method. The interior, distortion parameters of each camera and the relative exterior parameters are optimized through bundle adjustment of the network geometry that is strengthened through applying the distance constraints. This method provides both internal precision and external accuracy assessment of the calibration performance. Simulations and real data experiments are designed and conducted to validate the effectivity of the method and analyze its performance under different network geometries. The RMSE of length measurement is less than 0.25 mm and the relative precision is higher than 1/25,000 for a two camera system calibrated by the proposed method in a volume of 12 m × 8 m × 4 m. Compared with the state-of-the-art point array self-calibrating bundle adjustment method, the proposed method is easier to operate and can significantly reduce systematic errors caused by wrong scaling.
    Electronic ISSN: 1424-8220
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Published by Molecular Diversity Preservation International
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