The Experts below are selected from a list of 47109 Experts worldwide ranked by ideXlab platform
Silong Peng - One of the best experts on this subject based on the ideXlab platform.
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Video luminance transient improvement using difference-of-Gaussian
2009 15th Asia-Pacific Conference on Communications, 2009Co-Authors: Yangang Wang, Xi Chen, Hua Han, Silong PengAbstract:Luminance Transient Improvement (LTI) technique is widely used to enhance the sharpness of digital images or videos. In this paper, a high-performance and low-complexity LTI method is proposed for practical video processing applications. Utilizing the favorable characteristics of Gaussian function, the proposed algorithm generates the Correction Signal using the difference of the outputs of two Gaussian filters with different variances, and then modulates the Correction Signal adaptively according to the local contrast information of images or video frames. It finally utilizes a 2-D min/max nonlinear filter to suppress overshoots and undershoots appearing around edges in the video frame. And the critical modules are analyzed for practical hardware implementation for their simplicity. The performance of the method are highly confirmed by practical experimental results and proven to be effective and efficient in making steeper edges, and improving the visual quality of images or video frames while suppressing noise and reducing artifacts to a desired extent.
David B. Grayden - One of the best experts on this subject based on the ideXlab platform.
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Author Correction: Signal quality of simultaneously recorded endovascular, subdural and epidural Signals are comparable.
Scientific reports, 2018Co-Authors: Sam E. John, Nicholas L. Opie, Yan T. Wong, Gil S. Rind, Stephen M. Ronayne, Giulia Gerboni, Sébastien H. Bauquier, Terence J. O'brien, Clive N. May, David B. GraydenAbstract:A Correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has not been fixed in the paper.
Vasilis Ntziachristos - One of the best experts on this subject based on the ideXlab platform.
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Wideband Fiber-Interferometer Stabilization With Variable Phase
IEEE Photonics Technology Letters, 2012Co-Authors: Amir Rosenthal, Stephan Kellnberger, George D. Sergiadis, Vasilis NtziachristosAbstract:We report on a robust scheme for wideband variable-phase interferometer stabilization based on active modulation. In contrast to previous schemes, the Correction Signal is generated without using second harmonics, whose low amplitude often requires employing narrowband lock-in amplifiers. Resonances in the element modulating the phase are attenuated to enable high gain without high-frequency oscillations. Operation over a 3-kHz bandwidth is demonstrated.
Yangang Wang - One of the best experts on this subject based on the ideXlab platform.
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Video luminance transient improvement using difference-of-Gaussian
2009 15th Asia-Pacific Conference on Communications, 2009Co-Authors: Yangang Wang, Xi Chen, Hua Han, Silong PengAbstract:Luminance Transient Improvement (LTI) technique is widely used to enhance the sharpness of digital images or videos. In this paper, a high-performance and low-complexity LTI method is proposed for practical video processing applications. Utilizing the favorable characteristics of Gaussian function, the proposed algorithm generates the Correction Signal using the difference of the outputs of two Gaussian filters with different variances, and then modulates the Correction Signal adaptively according to the local contrast information of images or video frames. It finally utilizes a 2-D min/max nonlinear filter to suppress overshoots and undershoots appearing around edges in the video frame. And the critical modules are analyzed for practical hardware implementation for their simplicity. The performance of the method are highly confirmed by practical experimental results and proven to be effective and efficient in making steeper edges, and improving the visual quality of images or video frames while suppressing noise and reducing artifacts to a desired extent.
J. Agüera - One of the best experts on this subject based on the ideXlab platform.
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Assessing GNSS Correction Signals for assisted guidance systems in agricultural vehicles
Precision Agriculture, 2011Co-Authors: M. Pérez-ruiz, J. Carballido, J. AgüeraAbstract:Accuracy levels achieved with differential global positioning system (DGPS) receivers in agricultural operations depend upon the quality of the Correction Signal. This study has assessed differential Signal error from a Dedicated Base Station, OmniSTAR VBS, European Geostationary Navigation Overlay System, European reference frame-IP for internet protocol (EUREF-IP) and radio navigation satellite aided technique (RASANT). These Signals were utilized in guidance assisting systems for agricultural applications, such as tillage, harvesting, planting and spraying, in which GPS receivers were used under dynamic conditions. Simulations of agricultural operations on different days and at different time slots and simultaneously recording the tractor′s geo-position from a DGPS receiver and the tractor′s geo-position from a real-time kinematic (RTK) GPS allowed the comparison of the GPS Correction Signals. The hardware used for tractor guidance was a lightbar (Trimble model EZ-Guide Plus) system. ANOVA statistics showed a significant difference between the accuracy of the Correction Signals from different sources. GPS Correction Signal recommendations to farmers depend upon the accuracy required for the specific operation: (a) Yield monitoring and soil sampling (
