Searched for: subject%3A%22Computer%255C%2BVision%22
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Burghouts, G.J. (author), Kruithof, M.C. (author), Huizinga, W. (author), Schutte, K. (author)
Learning object detection models with a few labels, is possible due to ingenious few-shot techniques, and due to clever selection of images to be labeled. Few-shot techniques work with as few as 1 to 10 randomized labels per object class. We are curious if performance of randomized label selection can be improved by selecting 1 to 10 labels per...
conference paper 2022
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Numan, N. (author), Haar, F.T. (author), Cesar, P. (author)
Head-mounted displays (HMDs) are an essential display device for the observation of virtual reality (VR) environments. However, HMDs obstruct external capturing methods from recording the user’s upper face. This severely impacts social VR applications, such as teleconferencing, which commonly rely on external RGB-D sensors to capture a...
conference paper 2021
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Katsaros, E. (author), Bouma, H. (author), van Rooijen, A.L. (author), van Dusseldorp, E. (author)
Vehicle re-identification refers to the task of matching the same query vehicle across non-overlapping cameras and diverse viewpoints. Research interest on the field emerged with intelligent transportation systems and the necessity for public security maintenance. Compared to person, vehicle re-identification is more intricate, facing the...
conference paper 2020
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van de Wouw, D.W.J.M. (author), ter Haar, F.B. (author), Dubbelman, G. (author), de With, P.H.N. (author)
We propose a real-time change detection system to be used as a vehicle-mounted early-warning system for indicators of improvised explosive devices. Within the context of military route clearance, the system automatically detects suspicious changes in the environment with respect to a previous patrol. For this purpose, historical images of the...
article 2019
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Satsangi, Y. (author), Whiteson, S. (author), Oliehoek, F.A. (author), Bouma, H. (author)
Automated tracking is key to many computer vision applications. However, many tracking systems struggle to perform in real-time due to the high computational cost of detecting people, especially in ultra high resolution images. We propose a new algorithm called PartiMax that greatly reduces this cost by applying the person detector only to the...
conference paper 2017
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Toet, A. (author)
Edge preserving filters aim to simplify the representation of images (e.g., by reducing
article 2016
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van Leeuwen, C.J. (author), van Huis, J.R. (author), Baan, J. (author)
Wide Area Motion Imagery (WAMI) enables image based surveillance of areas that can cover multiple square kilometers. Interpreting and analyzing information from such sources, becomes increasingly time consuming as more data is added from newly developed methods for information extraction. Captured from a moving Unmanned Aerial Vehicle (UAV), the...
conference paper 2016
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Bijl, P. (author), Kooi, F.L. (author), Hogervorst, M.A. (author)
End-to-end Electro-Optical system performance tests such as TOD, MRTD and MTDP require the effort of several trained human observers, each performing a series of visual judgments on the displayed output of the system. This significantly contributes to the costs of sensor testing. Currently, several synthetic human observer models exist that can...
conference paper 2014
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Azzopardi, G. (author)
doctoral thesis 2013
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Bouma, H. (author), Burghouts, G.J. (author), de Penning, H.L.H. (author), Hanckmann, P. (author), ten Hove, R.J.M. (author), Korzec, S. (author), Kruithof, M.C. (author), Landsmeer, S. (author), van Leeuwen, C.J. (author), van den Broek, S.P. (author), Halma, A.H.R. (author), den Hollander, R.J.M. (author), Schutte, K. (author)
Ground surveillance is normally performed by human assets, since it requires visual intelligence. However, especially for military operations, this can be dangerous and is very resource intensive. Therefore, unmanned autonomous visual-intelligence systems are desired. In this paper, we present an improved system that can recognize actions of a...
conference paper 2013
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Lefter, I. (author), Rothkrantz, L. (author), Somhorst, M. (author)
At this moment many surveillance systems are installed in public domains to control the safety of people and properties. They are constantly watched by human operators who are easily overloaded. To support the human operators, a surveillance system model is designed that detects suspicious behaviour in a non-public area. Its task is to alert the...
conference paper 2012
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Bouma, H. (author), Hanckmann, P. (author), Marck, J.W. (author), de Penning, H.L.H. (author), den Hollander, R.J.M. (author), ten Hove, R.J.M. (author), van den Broek, S.P. (author), Schutte, K. (author), Burghouts, G.J. (author)
Surveillance is normally performed by humans, since it requires visual intelligence. However, it can be dangerous, especially for military operations. Therefore, unmanned visual-intelligence systems are desired. In this paper, we present a novel system that can recognize human actions. Central to the system is a break-down of high-level...
conference paper 2012
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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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Hofmann, K.M. (author)
The recovery of 3D human pose is an important problem in computer vision with many potential applications in human computer interfaces, motion analysis (e.g. sports, medical) and surveillance. 3D human pose also provides informative, viewinvariant features for a subsequent activity recognition step. Most if not all previous work on 3D human pose...
doctoral thesis 2011
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TNO Defensie en Veiligheid (author), Withagen, P.J. (author), Schutte, K. (author), Groen, F.C.A. (author)
Changing image intensities causes problems for many computer vision applications operating in unconstrained environments. We propose generally applicable algorithms to correct for global differences in intensity between images recorded with a static or slowly moving camera, regardless of the cause of intensity variation. The proposed intensity...
article 2010
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Dubbelman, G. (author), Groen, F.C.A. (author), TNO Defensie en Veiligheid (author)
This contribution addresses the problem of bias in stereo based motion estimation. Using a biased estimator within a visual-odometry system will cause significant drift on large trajectories. This drift is often minimized by exploiting auxiliary sensors, (semi-)global optimization or loop-closing. In this paper it is shown that bias in the...
conference paper 2009
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Hofmann, K.M. (author), Gavrila, D.M. (author), TNO Defensie en Veiligheid (author)
We present a system for the estimation of unconstrained 3D human upper body movement from multiple cameras. Its main novelty lies in the integration of three components: single-frame pose recovery, temporal integration and model adaptation. Single-frame pose recovery consists of a hypothesis generation stage, where candidate 3D poses are...
conference paper 2009
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Pauwels, E.J. (author), de Zeeuw, P.M. (author), Ranguelova, E.B. (author), TNO Informatie- en Communicatietechnologie (author)
We present an algorithm that performs image-based queries within the domain of tree taxonomy. As such, it serves as an example relevant to many other potential applications within the field of biodiversity and photo-identification. Unsupervised matching results are produced through a chain of computer vision and image processing techniques,...
article 2009
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Dubbelman, G. (author), van der Mark, W. (author), Groen, F.C.A. (author), TNO Defensie en Veiligheid (author)
A novel robust visual-odometry technique, called EM-SE(3) is presented and compared against using the random sample consensus (RANSAC) for ego-motion estimation. In this contribution, stereo-vision is used to generate a number of minimal-set motion hypothesis. By using EM-SE(3), which involves expectation maximization on a local linearization of...
conference paper 2008
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Liefhebber, F. (author), Sijs, J. (author), TNO Industrie en Techniek (author)
The rehabilitation robot Manus is an assistive device for severely motor handicapped users. The executing of all day living tasks with the Manus, can be very complex and a vision-based controller can simplify this. The lack of existing vision-based controlled systems, is the poor reliability of the computer vision in unstructured environments....
conference paper 2007
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