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Heemskerk, C.J.M. (author), Eendebak, P.T. (author), Schropp, G.Y.R. (author), Hermes, H.V. (author), Elzendoorn, B.S.Q. (author), Magielsen, A.J. (author)
Maintenance operations on ITER tokamak components will be largely performed by remote handling. In previous work it was shown that representative maintenance tasks could be performed significantly faster with direct visual feedback than with camera feedback. In post-test interviews, operators indicated that they regarded the lack of 3D...
article 2013
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de Jong, A.N. (author)
Measurements taken through the year in False Bay, South Africa, are helping to validate models of sensor performance for a range of practical applications
article 2011
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Alic, L. (author), Niessen, W.J. (author), Veenland, J.F. (author)
Background:Many techniques are proposed for the quantification of tumor heterogeneity as an imaging biomarker for differentiation between tumor types, tumor grading, response monitoring and outcome prediction. However, in clinical practice these methods are barely used. This study evaluates the reported performance of the described methods and...
article 2014
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Alić, L. (author), van Vliet, M. (author), van Dijke, C.F. (author), Eggermont, A.M.M. (author), Veenland, J.F. (author), Niessen, W.J. (author)
This study aims to quantify the heterogeneity of tumour enhancement in dynamic contrast-enhanced MRI (DCE-MRI) using texture analysis methods. The suitability of the coherence and the fractal dimension to monitor tumour response was evaluated in 18 patients with limb sarcomas imaged by DCE-MRI pre- and post-treatment. According to the...
article 2011
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Burghouts, G.J. (author), Schutte, K. (author)
We investigate how human action recognition can be improved by considering spatio-temporal layout of actions. From literature, we adopt a pipeline consisting of STIP features, a random forest to quantize the features into histograms, and an SVM classifier. Our goal is to detect 48 human actions, ranging from simple actions such as walk to...
article 2013
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Lefter, I. (author), Burghouts, G.J. (author), Rothkrantz, L.J.M. (author)
Stressful situations are likely to occur at human operated service desks, as well as at human-computer interfaces used in public domain. Automatic surveillance can help notifying when extra assistance is needed. Human communication is inherently multimodal e.g. speech, gestures, facial expressions. It is expected that automatic surveillance...
article 2014
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Burghouts, G.J. (author), Marck, J.W. (author)
We propose a mechanism to assess threats that are based on observables. Observables are properties of persons, i.e., their behavior and interaction with other persons and objects. We consider observables that can be extracted from sensor signals and intelligence. In this paper, we discuss situation assessment that is based on observables for...
article 2011
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Burghouts, G.J. (author)
The bag-of-features model is a distinctive and robust approach to detect human actions in videos. The discriminative power of this model relies heavily on the quantization of the video features into visual words. The quantization determines how well the visual words describe the human action. Random forests have proven to efficiently transform...
article 2013
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Hofmann, K.M. (author), Gavrila, D.M. (author)
We introduce a framework for unconstrained 3D human upper body pose estimation from multiple camera views in complex environment. Its main novelty lies in the integration of three components: single-frame pose recovery, temporal integration and model texture adaptation. Single-frame pose recovery consists of a hypothesis generation stage, in...
article 2012
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Lefter, I. (author), Rothkrantz, L.J.M. (author), Burghouts, G.J. (author)
Multimodal fusion is a complex topic. For surveillance applications audio-visual fusion is very promising given the complementary nature of the two streams. However, drawing the correct conclusion from multi-sensor data is not straightforward. In previous work we have analysed a database with audio- visual recordings of unwanted behavior in...
article 2013
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Burghouts, G.J. (author), Schutte, K. (author), Bouma, H. (author), den Hollander, R.J.M. (author)
In this paper, a system is presented that can detect 48 human actions in realistic videos, ranging from simple actions such as ‘walk’ to complex actions such as ‘exchange’. We propose a method that gives a major contribution in performance. The reason for this major improvement is related to a different approach on three themes: sample selection...
article 2013
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Sanromà, G. (author), Patino, L. (author), Burghouts, G.J. (author), Schutte, K. (author), Ferryman, J. (author)
We present a method for the recognition of complex actions. Our method combines automatic learning of simple actions and manual definition of complex actions in a single grammar. Contrary to the general trend in complex action recognition, that consists in dividing recognition into two stages, our method performs recognition of simple and...
article 2014
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Alić, L. (author), van Vliet, M. (author), Wielopolski, P.A. (author), ten Hagen, T.L.M. (author), van Dijke, C.F. (author), Niessen, W.J. (author), Veenland, J.F. (author)
Experimental evidence supports an association between heterogeneity in tumor perfusion and response to chemotherapy/radiotherapy, disease progression and malignancy. Therefore, changes in tumor perfusion may be used to assess early effects of tumor treatment. However, evaluating changes in tumor perfusion during treatment is complicated by...
article 2013
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Hofmann, K.M. (author), Gavrila, D.M. (author)
We present a novel approach for 3D human body shape model adaptation to a sequence of multi-view images, given an initial shape model and initial pose sequence. In a first step, the most informative frames are determined by optimization of an objective function that maximizes a shape–texture likelihood function and a pose diversity criterion (i...
article 2011
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Hofmann, K.M. (author), Gavrila, D.M. (author)
We present a novel approach for 3D human body shape model adaptation to a sequence of multi-view images, given an initial shape model and initial pose sequence. In a first step, the most informative frames are determined by optimization of an objective function that maximizes a shape–texture likelihood function and a pose diversity criterion (i...
article 2011
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Alić, L. (author), Haeck, J.C. (author), Bol, K. (author), Klein, S. (author), van Tiel, S.T. (author), Wielopolski, P.A. (author), Bijster, M. (author), Bernsen, M. (author), de Jong, M. (author), Niessen, W.J. (author), Veenland, J.F. (author)
Background:Magnetic resonance imaging (MRI), together with histology, is widely used to diagnose and to monitor treatment in oncology. Spatial correspondence between these modalities provides information about the ability of MRI to characterize cancerous tissue. However, registration is complicated by deformations during pathological processing,...
article 2011
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Rob Kemp, R.A.W. (author), Dijk, J. (author), Schutte, K. (author), Visser, N. (author)
A novel filter that enhances underwater video footage in remotely operated vehicle systems is well suited to both military and civilian applications
article 2014
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Torres, J. (author), Schutte, K. (author), Bouma, H. (author), Menendez, J.M. (author)
Many image processing methods, such as techniques for people re-identification, assume photometric constancy between different images. This paper addresses the correction of photometric variations based upon changes in background areas to correct foreground areas. We assume a multiple light source model where all light sources can have different...
article 2014
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Schwering, P.B.W. (author), van den Broek, S.P. (author), Kemp, R.A.W. (author), Lensen, H.A. (author), TNO Defensie en Veiligheid (author)
Present-day naval operations take place in coastal environments as well as narrow straits all over the world. Coastal environments around the world are exhibiting a number of threats to naval forces. In particular, a large number of asymmetric threats can be present in environments with cluttered backgrounds as well as rapidly varying...
conference paper 2010
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Hegyi, A. (author), Netten, B.D. (author), Wang, M. (author), Schakel, W. (author), Schreiter, T. (author), Yuan, Y. (author), van Arem, B. (author), Alkim, T. (author)
The SPECIALIST algorithm can resolve jam waves on freeways using roadside technology: detector loops and speed limit gantries. In this paper we extend the algorithm, enabling the integration with cooperative system technologies and other road side detectors, such as in-car detection and actuation, and video-based monitoring (VBM). Integrating...
conference paper 2013
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