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Lichtenauer, J.F. (author)The fundamental objective of this Ph.D. thesis is to gain more insight into what is involved in the practical application of a computer vision system, when the conditions of use cannot be controlled completely. The basic assumption is that research on isolated aspects of computer vision often leads to `too' general solutions. That these...doctoral thesis 2009
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De Haan, G. (author)Spatial scientific datasets are all around us, and 3D visualization is a powerful tool to explore details and structures within them. When dealing with complex spatial structures, interactive Virtual Reality (VR) systems can potentially improve exploration over desktop-based systems. However, from previous experience it was found that...doctoral thesis 2009
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Heusdens, R. (author), Hendriks, R.C. (author), Jensen, J. (author), Kjems, U. (author)Although most noise reduction algorithms are critically dependent on the noise power spectral density (PSD), most procedures for noise PSD estimation fail to obtain good estimates in nonstationary noise conditions. Recently, a DFT-subspace-based method was proposed which improves noise PSD estimation under these conditions. However, this...journal article 2009
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Hendriks, R.C. (author), Heusdens, R. (author), Kjems, U. (author), Jensen, J. (author)In this letter we present discrete Fourier transform (DFT) domain minimum mean-squared error (MMSE) estimators for multichannel noise reduction. The estimators are derived assuming that the clean speech magnitude DFT coefficients are generalized-Gamma distributed. We show that for Gaussian distributed noise DFT coefficients, the optimal...journal article 2009
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Dam, E.B. (author), Loog, M. (author), Christiansen, C. (author), Byrjalsen, I. (author), Folkesson, J. (author), Nielsen, M. (author), Qazi, A.A. (author), Pettersen, P.C. (author), Garnero, P. (author), Karsdal, M.A. (author)Introduction: At present, no disease-modifying osteoarthritis drugs (DMOADS) are approved by the FDA (US Food and Drug Administration); possibly partly due to inadequate trial design since efficacy demonstration requires disease progression in the placebo group. We investigated whether combinations of biochemical and magnetic resonance imaging ...journal article 2009
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Sypkens Smit, M. (author), Bronsvoort, W.F. (author)Finite element analysis is nowadays widely used for product testing. At various moments during the design phase, aspects of the physical behaviour of the product are simulated by performing an analysis of the model. For each analysis, a mesh needs to be created that represents the geometry of the model at that point. In particular during the...journal article 2009
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Richards, W. (author), Koenderink, J.J. (author), Van Doorn, A. (author)Unlike the Metelli monochrome transparencies, when overlays and their backgrounds have chromatic content, the inferred surface colors may not always be physically realizable, and are in some sense “imaginary.” In these cases, the inferred chromatic transmittance or reflectance of the overlay lies outside the RGB spectral boundaries. Using the...journal article 2009
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- Bidarra, R. (author), Zhang, X. (author) journal article 2009
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Knijnenburg, T.A. (author), Daran, J.M.G. (author), Van den Broek, M.A. (author), Daran-Lapujade, P.A.S. (author), De Winde, J.H. (author), Pronk, J.T. (author), Reinders, M.J.T. (author), Wessels, L.F.A. (author)OA Fund TU delft Background: Microorganisms adapt their transcriptome by integrating multiple chemical and physical signals from their environment. Shake-flask cultivation does not allow precise manipulation of individual culture parameters and therefore precludes a quantitative analysis of the (combinatorial) influence of these parameters on...journal article 2009
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Liu, H. (author), Heynderickx, I. (author)A novel no-reference blockiness metric that provides a quantitative measure of blocking annoyance in block-based DCT coding is presented. The metric incorporates properties of the human visual system (HVS) to improve its reliability, while the additional cost introduced by the HVS is minimized to ensure its use for real-time processing. This is...journal article 2009
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Van Nes, P. (author), Bellomo, D. (author), Reinders, M.J.T. (author), De Ridder, D. (author)In recent work, attempts have been made to link the structure of biochemical networks to their complex dynamics. It was shown that structurally stable network motifs are enriched in such networks. In this work, we investigate to what extent these findings apply to metabolic networks. To this end, we extend a previously proposed method by...journal article 2009
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Hulsman, M. (author), Reinders, M.J.T. (author), De Ridder, D. (author)In recent years, more and more high-throughput data sources useful for protein complex prediction have become available (e.g., gene sequence, mRNA expression, and interactions). The integration of these different data sources can be challenging. Recently, it has been recognized that kernel-based classifiers are well suited for this task. However...journal article 2008
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Hashemi, H. (author), Tax, D.M.J. (author), Duin, R.P.W. (author), Javaherian, A. (author), De Groot, P. (author)Seismic object detection is a relatively new field in which 3-D bodies are visualized and spatial relationships between objects of different origins are studied in order to extract geologic information. In this paper, we propose a method for finding an optimal classifier with the help of a statistical feature ranking technique and combining...journal article 2008
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Blaas, J. (author), Botha, C.P. (author), Post, F.H. (author)Parallel coordinate plots (PCPs) are commonly used in information visualization to provide insight into multi-variate data. These plots help to spot correlations between variables. PCPs have been successfully applied to unstructured datasets up to a few millions of points. In this paper, we present techniques to enhance the usability of PCPs for...journal article 2008
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Brinkman, W.P. (author), Haakma, R. (author), Bouwhuis, D.G. (author)This paper presents the results of a meta-analysis carried out on the results of six experiments to support the claim that component-specific usability measures are on average statistically more powerful than overall usability measures when comparing different versions of a part of a system. An increase in test effectiveness implies the need for...journal article 2008
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Erkelens, J.S. (author), Heusdens, R. (author)This paper considers estimation of the noise spectral variance from speech signals contaminated by highly nonstationary noise sources. The method can accurately track fast changes in noise power level (up to about 10 dB/s). In each time frame, for each frequency bin, the noise variance estimate is updated recursively with the minimum mean-square...journal article 2008
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Knijnenburg, T.A. (author), Wessels, L.F.A. (author), Reinders, M.J.T. (author)Motivation: Cells receive a wide variety of environmental signals, which are often processed combinatorially to generate specific genetic responses. Changes in transcript levels, as observed across different environmental conditions, can, to a large extent, be attributed to changes in the activity of transcription factors (TFs). However, in...journal article 2008
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Wang, J. (author), Robertson, S. (author), De Vries, A.P. (author), Reinders, M.J.T. (author)Collaborative filtering is concerned with making recommendations about items to users. Most formulations of the problem are specifically designed for predicting user ratings, assuming past data of explicit user ratings is available. However, in practice we may only have implicit evidence of user preference; and furthermore, a better view of the...journal article 2008
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- Van Waveren, J.M.P. (author), Rothkrantz, L.J.M. (author) book chapter 2008
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- Loog, M. (author) journal article 2008