Results 301 to 310 of about 1,723,588 (348)

Increasing the accuracy of imaging-based dimensional measurements

Optics and Photonics for Advanced Dimensional Metrology, 2020
More than 95% of industrial inspection systems still rely on pure 2D information. Different measurement tasks like defect detection, micro-structure characterization, spectral characterization and dimensional metrology are typical application scenarios where standard 2D image processing based measurement systems are used.
Tobias Haist, Adriana Steinitz, Flavio Guerra   +2 more
openaire   +2 more sources

In Vitro Measurement Accuracy of Three‐Dimensional Ultrasound

Echocardiography, 2001
Objectives: We sought to validate distance and volume measurements in three‐dimensional (3‐D) ultrasound images. Background: Even with the latest equipment, it is not known how accurate 3‐D echocardiographic measurements are. Methods: Six models were imaged in ethanol solution and two within a tissue phantom using a mechanical rotation device rotating ...
Tobias Trabold, Rainer J. Zotz, Christian Kollmann, Alexander Bock   +3 more
openaire   +3 more sources

Measuring Accuracy of Three-Dimensional Displacements in Holographic Interferometry

Applied Optics, 1973
In order to establish a quantitative method of measuring the distribution of three-dimensional displacements by holographic interferometry, measuring errors caused by the following two factors are analyzed quantitatively: (i) reading error of fringe order, (ii) setting error of observing and illuminating directions.
T. Matsumoto, K. Iwata, R. Nagata
openaire   +3 more sources

Improvement of dimensional measurement accuracy of microstructures with high aspect ratio with a spherical coupling fiber probe

, 2014
A specially designed and developed spherical coupling fiber probe was proposed to improve the dimensional measurement accuracy of microstructures with high aspect ratio.
Jiwen Cui, Yuanzheng Chen, Jiubin Tan
semanticscholar   +1 more source

The dimensional structure of transparency: A construct validation of transparency as disclosure, clarity, and accuracy in organizations

Human Relations, 2020
In this article, we advance research on transparency by developing and validating a measure based on recent theoretical insights about its dimensionality.
A. Schnackenberg, Edward C. Tomlinson, Corinne A. Coen   +2 more
semanticscholar   +1 more source

Three-dimensional measurement: The accuracy and precision of the reflex microscope

British Journal of Oral and Maxillofacial Surgery, 1988
The Reflex Microscope is an optical plotter which is linked directly to a microcomputer and allows direct three-dimensional measurements of irregular shaped objects up to 100 mm maximum dimension. This study shows that it is possible to generate reproducible results with an operator measurement error of less than 0.15 mm for linear distances.
C.D. Stephens, B. Speculand, G.W. Butcher   +2 more
openaire   +2 more sources

The accuracy of dimensional measurement in ultrasonic real-time scanning

The British Journal of Radiology, 1981
The ease of examination with real-time ultrasonic scanners, together with the provision of calipers, combine to make dimensional measurement of anatomical or pathological features an attractive index, that should ideally be independent of the operator.
R. C. Chivers, T. J. Bloomberg, R. A. Bacon   +2 more
openaire   +3 more sources

The method of minimizing the impact of local residual electrostatic charge on dimensional measurement accuracy in atomic force microscopy measurements

, 2011
Atomic force microscopy is an accurate and reliable method of surface investigation with nanometer resolution. One must however take into account the influence of certain issues that can have significant impact on the result.
A. Sikora
semanticscholar   +1 more source

Analysis of the effect of cone-beam geometry and test object configuration on the measurement accuracy of a computed tomography scanner used for dimensional measurement

, 2011
Industrial x-ray computed tomography (CT) scanners are used for non-contact dimensional measurement of small, fragile components and difficult-to-access internal features of castings and mouldings.
J. Kumar, A. Attridge, Paul Wood, M. Williams   +3 more
semanticscholar   +1 more source

Application of masked two-dimensional Fourier spectra for improving the accuracy of STIV-based river surface flow velocity measurements

Measurement science and technology, 2020
Space-time image velocimetry (STIV) is a well-established image-based technique for measuring river surface flow from videos or image time series. Because the fundamental measurement mechanism is relatively simple, STIV has been used widely in research ...
I. Fujita, T. Shibano, K. Tani
semanticscholar   +1 more source