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Browsing Vision, Graphics and Visualisation Group by Issue Date

Browsing Vision, Graphics and Visualisation Group by Issue Date

Now showing items 1-20 of 80

Spectral changes in inhomogeneous media : a quasi-optical approach

Zwiggelaar, Reyer; Wilson, M. G. F. (1993-10-01)

Spectral changes in inhomogeneous media depending on the spatial coherence of the source can be described by a quasi-optical approach. Assuming a Gaussian-Schell model source the spectral changes are described by using a ...
Single Mueller matrix description of the propagation of degree of polarisation in a uniformly anisotropic single-mode optical fibre

Wilson, M. G. F.; Zwiggelaar, Reyer (1994)

Changes in the degree of polarisation are described by a single Mueller matrix. Both the monochromatic and quasimonochromatic cases are discussed. The authors show how the propagating degree of polarisation depends on the ...
Optical determination of fractal dimensions using Fourier transforms

Zwiggelaar, Reyer; Bull, C. R. (1995)

Links between the fractal Hausdorff dimension, the Fourier transform of two-dimensional scenes, and image segmentation by texture are discussed. It is shown that the fractal Hausdorff dimension can be derived by integration ...
100 Jaar rontgen straling: wisselwerking tussen theorie, experiment en simulatie

Zwiggelaar, Reyer (1995)

Ongeveer honderd jaar geleden werd rontgenstraling voor het eerst waargenomen. Nog steeds worden niet alle aspecten van dit gedeelte van het elektromagnetische spectrum volledig begrepen. Er heeft zich een onderzoekscultuur ...
Imaging as a technique for assessment and control in the field

Stafford, J. V.; Zwiggelaar, Reyer; Bull, C. R. (1995)

This paper discusses the potential of using vision systems to monitor and control arable farming operations. Several examples, predominately concerned with the detection of weeds in crops, that have been or are being ...
X-ray simulations for imaging applications in the agricultural and food industry

Bull, C. R.; Mooney, M. J.; Zwiggelaar, Reyer (1996)

X-rays have not yet been used to their fullest potential in a range of application areas, especially the agricultural and food industries. As a sub-surface technique, X-ray radiation can give three-dimensional information ...
Using spectral information and machine vision for bruise detection on peaches and apricots

Garcia-Pardo, E.; Yang, Q.; Bull, C. R.; Zwiggelaar, Reyer (1996)

This paper addresses the problem of detecting bruises on peaches and apricots using machine vision. Bruises were created in a controlled manner on freshly harvested sample fruits. The spectral reflectance characteristics ...
Propagation of the degree of polarisation in a few-mode optical fibre: Experimental results

Zwiggelaar, Reyer; Wilson, M. G. F. (1996)

Experimental results are presented for the changes in the degree of polarization upon propagation in the LP(01) mode in a few-mode optical fibre. The dependence on the temporal coherence of the source is shown. The general ...
Inspection of teats by colour image analysis for automatic milking systems

Bull, C. R.; McFarlane, N. J. B.; Zwiggelaar, Reyer; Allen, C. J.; Mottram, T. T. (1996-05-01)

In order to implement robotic milking it is necessary to automate the inspection and cleaning of cow teats prior to milking. This paper assesses the potential of detecting manure on teats using information from a colour ...
The detection of 'soft' materials by selective energy xray transmission imaging and computer tomography

Mooney, M. J.; Bull, C. R.; Zwiggelaar, Reyer; Czarnes, S. (1997)

Xray imaging is a well established technique of detecting strongly attenuating materials and has been applied to a number of inspection applications within the agricultural and food industries. However, there are still ...
Review of inspection techniques based on the elastic and inelastic scattering of X-rays and their potential in the food and agricultural industry

Zwiggelaar, Reyer; Speller, R. D.; Bull, C. R. (1997)

X-rays that are elastically or inelastically scattered from a sample provide valuable information about the internal characteristics of a sample such as the molecular structure, density and atomic number. Also since the ...
Modelling uncertainty in agricultural image analysis

Onyango, Christine M.; Marchant, John A.; Zwiggelaar, Reyer (1997-06)

No absolute certainty can be given for information derived from images. In most cases image analysis uses single algorithms, or multiple single algorithms' results which are combined in an ad hoc manner, to derive certain ...
Discrimination between low atomic number materials from their characteristic scattering of X-ray radiation

Bull, C. R.; Zwiggelaar, Reyer (1997-10)

There are many applications within the agricultural, food and medical sciences where it is required to detect targets that absorb X-rays in a similar way to the background material and these are therefore not easy to detect ...
A review of spectral properties of plants and their potential use for crop/weed discrimination in row-crops

Zwiggelaar, Reyer (1998)

The use of spectral information for the discrimination of crops and weeds is reviewed, discussing research results covering most of this century. This includes discussions about the modelling of reflection from vegetation ...
Model-based detection of spiculated lesions in mammograms

Parr, T. C.; Schumm, J. E.; Boggis, C. R. M.; Zwiggelaar, Reyer; Taylor, C. J.; Astley, S. M.; Hutt, I. W. (1999)

Computer-aided mammographic prompting systems require the reliable detection of a variety of signs of cancer. In this paper we concentrate on the detection of spiculated lesions in mammograms. A spiculated lesion is typically ...
Automated quality assurance applied to mammographic imaging

Holubinka, M.; Davis, A.; Zwiggelaar, Reyer; Marti, R.; Blot, L. (2002)

Quality control in mammography is based upon subjective interpretation of the image quality of a test phantom. In order to suppress subjectivity due to the human observer, automated computer analysis of the Leeds TOR(MAM) ...
Automatic point correspondence and registration based on linear structures

Rubin, C. M. E.; Marti, R.; Zwiggelaar, Reyer (2002)

A novel method to obtain point correspondence in pairs of images is presented. Our approach is based on automatically establishing correspondence between linear structures which appear in images using robust features such ...
Using hybrid knowledge engineering and image processing in color virtual restoration of ancient murals

Pan, Yunhe; Liu, Yonghuai; Wei, Baogang (2003-09)

Abstract—This paper proposes a novel scheme to virtually restore the colors of ancient murals. Our approach integrates artificial intelligence techniques with digital image processing methods. The knowledge related to the ...
Two-Dimensional–Three-Dimensional Correspondence in Mammography

Rubin, C. M. E.; Marti, R.; Denton, Erika R. E.; Zwiggelaar, Reyer (2004)

We present a framework for the registration and correspondence of magnetic resonance (MR) (three-dimensional data, 3D, data) and x-ray (two-dimensional data, 2D, data) mammographic images. The robustness of this work relies ...
Linear structures in mammographic images: detection and classification

Boggis, C. R. M.; Taylor, C. J.; Astley, S. M.; Zwiggelaar, Reyer (2004)

We describe methods for detecting linear structures in mammograms, and for classifying them into anatomical types (vessels, spicules, ducts, etc). Several different detection methods are compared, using realistic synthetic ...

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