| 1. |
- Rickne, Annika, 1966, et al.
(författare)
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Innovation Management
- 2013
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Ingår i: Management : an advanced introduction. Alexander Styhre and Lars Strannegård (Eds.). - Lund : Studentlitteratur. - 9789144093284
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Bokkapitel (refereegranskat)
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| 2. |
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| 3. |
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| 4. |
- Bengtsson, Tomas, 1983, et al.
(författare)
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On robust optical flow estimation on image sequences with differently exposed frames using primal-dual optimization
- 2017
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Ingår i: Image and Vision Computing. - : Elsevier BV. - 0262-8856. ; 57, s. 78-88
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Tidskriftsartikel (refereegranskat)abstract
- Optical flow methods are used to estimate pixelwise motion information based on consecutive frames in image sequences. The image sequences traditionally contain frames that are similarly exposed. However, many real-world scenes contain high dynamic range content that cannot be captured well with a single exposure setting. Such scenes result in certain image regions being over- or underexposed, which can negatively impact the quality of motion estimates in those regions. Motivated by this, we propose to capture high dynamic range scenes using different exposure settings every other frame. A framework for OF estimation on such image sequences is presented, that can straightforwardly integrate techniques from the state-of-the-art in conventional OF methods. Different aspects of robustness of OF methods are discussed, including estimation of large displacements and robustness to natural illumination changes that occur between the frames, and we demonstrate experimentally how to handle such challenging flow estimation scenarios. The flow estimation is formulated as an optimization problem whose solution is obtained using an efficient primal–dual method.
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| 5. |
- Bengtsson, Tomas, 1983, et al.
(författare)
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Optical flow estimation on image sequences with differently exposed frames
- 2015
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Ingår i: Optical Engineering. - 1560-2303 .- 0091-3286. ; 54:9, s. Article Number: 093103-
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Tidskriftsartikel (refereegranskat)abstract
- Optical flow (OF) methods are used to estimate dense motion information between consecutive frames in image sequences. In addition to the specific OF estimation method itself, the quality of the input image sequence is of crucial importance to the quality of the resulting flow estimates. For instance, lack of texture in image frames caused by saturation of the camera sensor during exposure can significantly deteriorate the performance. An approach to avoid this negative effect is to use different camera settings when capturing the individual frames. We provide a framework for OF estimation on such sequences that contain differently exposed frames. Information from multiple frames are combined into a total cost functional such that the lack of an active data term for saturated image areas is avoided. Experimental results demonstrate that using alternate camera settings to capture the full dynamic range of an underlying scene can clearly improve the quality of flow estimates. When saturation of image data is significant, the proposed methods show superior performance in terms of lower endpoint errors of the flow vectors compared to a set of baseline methods. Furthermore, we provide some qualitative examples of how and when our method should be used.
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| 6. |
- Bengtsson, Tomas, 1983, et al.
(författare)
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Super-resolution reconstruction of high dynamic range images in a perceptually uniform domain
- 2013
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Ingår i: Optical Engineering. - 1560-2303 .- 0091-3286. ; 52:10
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Tidskriftsartikel (refereegranskat)abstract
- Super resolution is a signal processing method that utilizesinformation from multiple degraded images of the same scene in order to reconstruct an image with enhanced spatial resolution. The method is typically employed on similarly exposed pixel valued images, but it can be extended to differently exposed images with a high combined dynamicrange. We propose a novel formulation of the joint super-resolution, high dynamic range image reconstruction problem, using an image domain in which the residual function of the inverse problem relates to the perception of the human visual system. Simulated results are presented,including a comparison with a conventional method, demonstrating that the proposed approach avoids some severe reconstruction artifacts.
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| 7. |
- Bengtsson, Tomas, 1983, et al.
(författare)
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Super-resolution reconstruction of high dynamic range images with perceptual weighting of errors
- 2013
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Ingår i: ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. - 1520-6149. - 9781479903566 ; , s. 2212-2216
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Konferensbidrag (refereegranskat)abstract
- Super-Resolution and High Dynamic Range image reconstruction are two different signal processing techniques that share in common that they utilize information from multiple observations of the same scene to enhance visual image quality. In this paper, both techniques are merged in a common model, and the focus is to solve the reconstruction problem in a suitable image domain, which relates to the perception of the Human Visual System. Simulated results are presented, including a comparison with a conventional method, demonstrating the benefits of the proposed approach, in this case avoiding some severe reconstruction artifacts.
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| 8. |
- Bengtsson, Tomas, 1983, et al.
(författare)
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Variational Optical Flow Estimation for Images with Spectral and Photometric Sensor Diversity
- 2015
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Ingår i: Proceedings of SPIE - The International Society for Optical Engineering. - : SPIE. - 0277-786X .- 1996-756X. - 9781628415582 ; 9443, s. Art. no. 94431U-
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Konferensbidrag (refereegranskat)abstract
- Motion estimation of objects in image sequences is an essential computer vision task. To this end, optical flow methods compute pixel-level motion, with the purpose of providing low-level input to higher-level algorithms and applications. Robust flow estimation is crucial for the success of applications, which in turn depends on the quality of the captured image data. This work explores the use of sensor diversity in the image data within a framework for variational optical flow. In particular, a custom image sensor setup intended for vehicle applications is tested. Experimental results demonstrate the improved flow estimation performance when IR sensitivity or flash illumination is added to the system.
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| 10. |
- Bourelos, Evangelos, 1982, et al.
(författare)
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Academic Patenting in Sweden: New Evidence from the 2011 Database
- 2012
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Ingår i: ESF-APE-INV workshop: “Scientists & Inventors” – KU Leuven, 10-11 May 2012.
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Konferensbidrag (refereegranskat)abstract
- Abstract: After the collection of data on Swedish academic inventors in 2011, we created a longitudinal dataset containing two points in time. The 2005 dataset has indicated that research intense universities take the most patents, a trend which still remains. We describe and analyze the dynamics within the different disciplines among the 6 universities with highest number of patents. For these 6 universities data from 2009 are combined and compared too. Preliminary results indicate that Sweden still performs better than other European countries, where data available.
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