| 21. |
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| 22. |
- Nordin, Lisa, 1981-, et al.
(författare)
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Measurement and prediction of dewatering characteristics for mechanical pulps using optical fibre analyzers
- 2009
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Ingår i: Proceedings - 2009 International Mechanical Pulping Conference, IMPC 2009. ; , s. 309-316
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Konferensbidrag (refereegranskat)abstract
- The aim of this work was to obtain an on-line measurement for dewatering behaviour in the wire section based on fibre and fines characteristics. Four laboratory dewatering equipments were compared and the fibre characteristics were measured by means of optical fibre analyzers. The results show that rough correlations do appear to exist between the dewatering equipments; however they rank the pulps differently depending on the raw wood material used and whether the refining conditions are mild or harsh. The prediction models based on fibre characteristics showed a high degree of statistical accuracy. The descriptions, however, proved not to be sufficiently good with regards to the dewatering behaviour for them to be used in relation to on-line applications. This might have been because consideration was not given to some important variables which do, in fact, have a significant impact on the drainability. These variables could include physical fibre properties or others that are not measured, or properties that, at present, are unable to be measured at a sufficient resolution.
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| 23. |
- Norell, Håkan, et al.
(författare)
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A Generalized Architecture for Hardware Synthesis of Spatio-Temporal Memory Models for Image Processing Systems
- 2005
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Ingår i: IWSSIP 2005 - Proceedings of the 12th International Worshop on Systems, Signals & Image Processing. - : InderScience Publishers. - 0907776205 ; , s. 361-365
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Konferensbidrag (refereegranskat)abstract
- This paper presents a generalized architecture for the synthesis of application specific memory architectures for real-time image processing systems. The memory generation presented in this paper can handle both spatial and spatio-temporal memory models. The results show that the architecture efficiently solves the problems related to memory accesses for most of the available video image processing filters available at present.
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| 24. |
- Norell, Håkan, et al.
(författare)
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Automatic Generation of Spatial and Temporal Memory Architectures for Embedded Video Processing Systems
- 2007
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Ingår i: EURASIP Journal on Embedded Systems. - : Springer Science and Business Media LLC. - 1687-3955 .- 1687-3963. ; 2007
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents a tool for automatic generation of the memory management implementation for spatial and temporal real-time video processing systems targeting field programmable gate arrays (FPGAs). The generator creates all the necessary memory and control functionality for a functional spatio-temporal video processing system. The required memory architecture is automatically optimized and mapped to the FPGAs' memory resources thus producing an efficient implementation in terms of used internal resources. The results in this paper show that the tool is able to efficiently and automatically generate all required memory management modules for both spatial and temporal real-time video processing systems.
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| 25. |
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| 26. |
- Norlin, Börje, 1967-, et al.
(författare)
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Energy Resolved X-ray Imaging as a Tool for Characterization of Paper Coating Quality
- 2009
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Ingår i: IEEE Nuclear Science Symposium Conference Record 2009. - : IEEE conference proceedings. - 9781424439621 ; , s. 1703-1706
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Konferensbidrag (refereegranskat)abstract
- Energy resolved X-ray imaging can be used as a tool to analyze the variation in the chemical content of an object. In this work we have used energy resolved X-ray imaging to measure the variation in the chemical content of paper and paper coating. This is an important quality parameter for the paper industry. In order to separate the variation in coating thickness from the variation in paper thickness, energy resolution is used to separate the response of the coating from the response of the paper. The MEDIPIX2 single photon processing X-ray imaging system [1] has been used in the measurements. The measurement results are compared to simulations with MCNP. The influence of charge sharing is discussed and the effects have been studied by comparing results from detectors with 220x220 µm2 pixels and detectors with 55x55 µm2 pixels. There is a trade-off between good spatial resolution obtained with detectors with small pixels and good energy resolution obtained with detectors with large pixels. The requirements on image quality, to achieve the resolution of coating distribution relevant for the application, are discussed.
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| 27. |
- O'Nils, Mattias, et al.
(författare)
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A Project Based Master's Programme for SoF/SoC based Sensor Systems
- 2005
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Ingår i: Proceedings of the 2005 European Conference on Circuit Theory and Design. - : IEEE conference proceedings. - 0780390660 ; , s. 123-126
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Konferensbidrag (refereegranskat)abstract
- We forsee an increase in communicating sensor systems, that we call Sensible Things that Communicate (STC). These systems range from simple powerless systems for control or classification. In this paper we present the curriculum and pedagogical methods used in a Master's programme developed to meet the requirements that STC systems put on a designer. The goal for the program has been to encurage the students to acquire knowlege from completing practical design cases, of industrial or academic interest. This has shown to be an effective method to learn an motivate the students.
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| 28. |
- O'Nils, Mattias, et al.
(författare)
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Data Partitioning for Parallel Implementation of Real-Time Video Processing Systems
- 2005
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Ingår i: Proceedings of the 2005 European Conference on Circuit Theory and Design. - : IEEE conference proceedings. - 0780390660 - 9780780390669 ; , s. 213-216
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Konferensbidrag (refereegranskat)abstract
- The main reason for using data partitioning for a video processing system is the increase in performance it offers. This paper presents a comparison of the buffering requirements for different data partitioning methods used in video processing systems. The analysis shows that the buffer storage required for the implementation of video systems is highly dependent on the partitioning strategy. The results indicate that partitioning the tasks vertically is by far the most efficient method when considering buffer sizes.
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| 29. |
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| 30. |
- O'Nils, Mattias, 1969-, et al.
(författare)
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Threshold Modulation for Continuous Energy Resolution with Two Channels per Pixel in a Photon Counting X-ray Image Detector
- 2009
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Ingår i: Nuclear Instruments and Methods in Physics Research Section A. - : Elsevier. - 0168-9002 .- 1872-9576. ; 607:1, s. 236-239
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Tidskriftsartikel (refereegranskat)abstract
- The introduction of energy resolution in X-ray image detectors will lead to tradeoffs between circuit complexity and spatial/energy resolution in the pixel design. The proposed method provides continuous energy resolution with only two energy channels per pixel, which is a comparable complexity to that of a window discriminator pixel like Medipix2. The paper illustrates the method and validates the method through analytical analysis and through simulation of real and synthetic data.
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