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  • 1
    Electronic Resource
    Electronic Resource
    A Circle Contour Measurement Technique Based on Randomized Hough Transform Using Gradient Information (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 295-296 (Oct. 2005), p. 277-282 
    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: Hough Transform (HT) is an image edge detection technique which is widely used in pattern recognition and computer vision. In this paper the fundamental principle of HT is analyzed and the defect of HT and Randomized Hough Transform (RHT) is indicated. An algorithm based on RHT and the information of grayscale and gradient in image is proposed. It uses the property of the pattern and is mainly used for detection of circle and arc contour measurement. This algorithm can decrease memory usage in computer by a multi to one mapping, accelerate the calculation speed by parallel algorithm, improve the edge detection accuracy by subpixel division, obtain the parameters of object by applying least square fitting algorithm. Based on the principle, a measurement system with high accuracy and efficiency in image capturing and processing is developed. Experiments are carried out in the system. The result of experiment has certified the feasibility and validity of the algorithm
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.295-296.277.pdf
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A High Precision Circuit Based on Digital Techniques for Roundness Measurement (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 295-296 (Oct. 2005), p. 271-276 
    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: In ultra high precision roundness measurement, a high accuracy and high integrated measuring circuit system equipped with inductive sensor are a developing trend. In order to meet the demand, a novel method to improve the accuracy of measuring circuit of amplitude modulation sensor using digital synthesizing, digital phase sensitivity detection (PSD), and digital set average techniques, is presented. The measuring circuit system based on the method is easy to realize and to operate. It can be plugged directly into an ISA Bus slot for use. Experimental results show that the stability of the sensor measuring system that consists of the measuring circuit system and a Taylor inductive sensor reaches nanometer accuracy. The digital measuring circuit of amplitude modulation can not only be applied widely in amplitude modulation measuring circuit for use of inductive sensors to improve the accuracy of the sensor measuring circuit system but also used in the one for use of capacitance sensors and magnetic grating sensors
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.295-296.271.pdf
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Measurement Method for Micro-Cavity Based on Improved MAP Algorithm (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 381-382 (June 2008), p. 191-194 
    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: In order to improve the measurement precision, an improved MAP algorithm is proposed toincrease the edge aiming precision in this paper. The algorithm breaks the limitation of degeneratedmodel, takes two actual factors into account, one is the distortion caused by motion, which solved byHuber-Markov random filed in the improved MAP algorithm, and the other is curvature of field,which solved by Delaunay triangle method. The algorithm can restore the high-frequency informationof image, keep the edge character of image, and increase the aiming precision of the edge during themeasurement. The experiments show that the uncertainty of location for the image captured in themeasurement can be improved three folds, and the repeatability uncertain is less then 0.8µm when thediameter of φ0.2mm hole is measured using the proposed MAP algorithm and length-measuringinterferometer together
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.381-382.191.pdf
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Recent Advances in our Research on Ultrahigh Resolution Laser Confocal Microscopy (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 381-382 (June 2008), p. 11-14 
    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: This paper presents the resent advances in our research on ultrahigh resolution laserconfocal microscopy to further improve the accuracy of non-contact 3D measurement ofmicro-structural dimensions and profiles at the level of micron/nanometer with emphasis on ways andmeans to improve axial and lateral resolutions. A scan measuring technique based on differentialconfocal microscopy is developed using the difference in the distribution of the scanning spot on nearand far confocal planes by keeping the detectors off-focus at equal distance before and after theconjugate image plane of the scanning spot. This differential confocal microscopic scan measuringtechnique can be used to double the measurement sensitivity and obviously expand the linear range toimprove the axial resolution, and to locate the tracking zero point at the center of the linear range withthe highest sensitivity to achieve the bipolar tracking properties. In addition, this new technique canbe used to effectively suppress the light source intensity drift and detector electronic drift and noise toimprove the S/N ratio. The differential confocal detection technique can be combined with the opticalsuperresolving filtering technique to improve both lateral and axial resolutions, and the confocaldetection technique based on micro optical arrays has a very promising potential application forimproving of detection efficiency
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.381-382.11.pdf
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    Paper (German National Licenses)
    Fulltext
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