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A bound for the range of a narrow light beam in the near field

Verbeek, P.W. (author), Van den Berg, P.M. (author)

We investigate the possibility of light beams that are both narrow and long range with respect to the wavelength. On the basis of spectral electromagnetic field representations, we have studied the decay of the evanescent waves, and we have obtained some bounds for the width and range of a light beam in the near-field region. The range...

journal article 2011

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On alphabetic presentations of Clifford algebras and their possible applications

Toppan, F. (author), Verbeek, P.W. (author)

In this paper, we address the problem of constructing a class of representations of Clifford algebras that can be named “alphabetic (re)presentations.” The Clifford algebra generators are expressed as m-letter words written with a three-character or a four-character alphabet. We formulate the problem of the alphabetic presentations, deriving the...

journal article 2009

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Method for transforming a coloured image

Verbeek, P.W. (author), Dijk, J. (author)

The invention relates to a method of transforming a colour image, wherein for each separate pixel a measured level of lightness, a measured chroma and a measured colour is determined, followed by a predetermined adjustment in the three-dimensional level of lightness, chroma and colour, wherein a. for each separate pixel a direction of adjustment...

patent 2004

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Toward the development of a Three-Dimensional Mid–Field Microscope

Garini, Y. (author), Kutchoukov, V.G. (author), Bossche, A. (author), Alkemade, P.F.A. (author), Docter, M.W. (author), Verbeek, P.W. (author), Van Vliet, L.J. (author), Young, I.T. (author)

Recently, an extraordinary transmission of light through small holes (<200 nm) in a thin metallic film has been described. This phenomenon has been shown to be the result of the photon-plasmon interaction in thin films where a periodic structure (such as a set of holes) is embedded in the film. One of the extraordinary results is that the beam...

conference paper 2004

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Apparatus and method for determining the three-dimensional shape of an object

Verbeek, P.W. (author), Meens, B.C.H. (author), Young, I.T. (author)

The invention relates to an apparatus for determining a three-dimensional shape of an object from a two-dimensional image, comprising a light source for illuminating the object, and a detector for forming an image of the illuminated object, wherein the light source emits a pattern of substantially needle-like light beams that are directed at the...

patent 2002

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Applications of image analysis in orientation space

Van Ginkel, M. (author), Van Vliet, L.J. (author), Verbeek, P.W. (author)

conference paper 2001

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Curvature Estimation in Oriented Patterns Using Curvilinear Models Applied to Gradient Vector Fields

Van de Weijer, J. (author), Van Vliet, L.J. (author), Verbeek, P.W. (author), Van Ginkel, M. (author)

journal article 2001

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Confidence and curvature estimation of curvilinear structures in 3-D

Bakker, P. (author), Van Vliet, L.P. (author), Verbeek, P.W. (author)

conference paper 2001

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Analysis and detection of 3-D curvilinear structures

Bakker, P. (author), Van Vliet, L.J. (author), Verbeek, P.W. (author)

conference paper 2001

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Robust Curve Detection using a Radon Transform in Orientation Space Applied to Fracture Detection in Borehole Images

Van Ginkel, M. (author), Kraaijveld., M.A. (author), Van Vliet, L.J. (author), Reding, E.P. (author), Verbeek, P.W. (author), Lammers, H.J. (author)

conference paper 2001

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Robust Curvature Estimation by Finding Optimal Circular Segments in Orientation SpaceLiquid Samples

Van Ginkel, M. (author), Van Vliet, L.J. (author), Verbeek, P.W. (author)

conference paper 2000

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Edge preserving orientation adaptive filtering

Bakker, P. (author), Van Vliet, L.J. (author), Verbeek, P.W. (author)

conference paper 1999

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Curvature Estimation from Orientation Fields

Van Ginkel, M. (author), Van de Weijer, J. (author), Van Vliet, L.J. (author), Verbeek, P.W. (author)

conference paper 1999

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A quantitative measure for the perception of sharpening and smoothing in images

Dijk, J. (author), De Ridder, D. (author), Verbeek, P.W. (author), Walraven, J. (author), Young, I.T. (author), Van Vliet, L.J. (author)

conference paper 1999

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Edge preserving orientation adaptive filtering

Bakker, P. (author), Van Vliet, L.J. (author), Verbeek, P.W. (author)

conference paper 1999

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Curvature Estimation for Overlapping Curved Patterns using Orientation Space

Van Ginkel, M. (author), Verbeek, P.W. (author), Van Vliet, L.J. (author)

conference paper 1998

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Recursive Gaussian Derivative Filters

Van Vliet, L.J. (author), Young, I.T. (author), Verbeek, P.W. (author)

conference paper 1998

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Multi-Orientation Estimation: Selectivity and Localization

Van Ginkel, M. (author), Verbeek, P.W. (author), Van Vliet, L.J. (author)

conference paper 1997

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Three-Dimensional Reconstruction of Biological Objects from Serial Sections Including Deformation Correction

Verbeek, F.J. (author)

doctoral thesis 1995

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Estimators for Orientation and Anisotropy in Digitized Images

Van Vliet, L.J. (author), Verbeek, P.W. (author)

conference paper 1995