| 11. |
- Lepistö, Niklas, et al.
(författare)
-
Design and Implementation of Video Pre-Processor for FPGA based SoC
- 2008
-
Konferensbidrag (refereegranskat)abstract
- FPGA based implementation of embedded systems has many attractive characteristics such as: flexibility, low cost, high integration, embedded distributed memories and ex-tensive parallelism. Real-time video processing is an ap-plication area where FPGA based implementations have significant potential. This paper presents the design and implementation of a video pre-processor suitable for use in embedded display applications. Some of the key functions of the pre-processor are cropping and scaling of input video frames and the possibility to use multiple pre-processors in parallel to provide multiple video streams to a display unit
|
|
| 12. |
- Lepistö, Niklas, et al.
(författare)
-
Design Exploration of Video Pre-Processor for FPGA based SoC
- 2006
-
Ingår i: Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics). - Berlin : Springer Verlag. - 354036708X - 9783540367086 ; , s. 87-92
-
Konferensbidrag (refereegranskat)abstract
- FPGA based implementation of embedded systems has many attractive characteristics such as: flexibility, low cost, high integration, embedded distributed memories and extensive parallelism. One application where there is a significant possible potential for FPGA is for the implementation of real-time video processing. In this paper we present an analysis of a video pre-processor and how this affects the FPGA and RAM resource usage and performance. From these results we indicate the best space-time mapping of operations under different design constraints. These results can be used as a decision base when implementing an FPGA based video enabled display unit.
|
|
| 13. |
|
|
| 14. |
- Lepistö, Niklas, et al.
(författare)
-
High Performance FPGA based Camera Architecture for Range Imaging
- 2005
-
Ingår i: 23rd NORCHIP Conference 2005. - : IEEE conference proceedings. - 1424400643 ; , s. 165-168
-
Konferensbidrag (refereegranskat)abstract
- Range imaging is often used in classification of objects in process industry. The speed of inspection needs to be high, so it does not become the bottleneck in the process. This paper presents an FPGA based architecture for range imaging. Using centre of gravity it calculates the range positions from 2D images. The results show that the proposed architecture can process range values with a performance up to 150 Msamples per second. Thus, using cheep standard technology we can achieve up to 3 times higher performance than expensive state-of-the-art high performance smart-cameras.
|
|
| 15. |
- Lundgren, Jan, et al.
(författare)
-
An Area Efficient Readout Architecture for Photon Counting Color Imaging
- 2007
-
Ingår i: Nuclear Instruments and Methods in Physics Research Section A. - : Elsevier BV. - 0168-9002 .- 1872-9576. ; 576:1, s. 132-136
-
Tidskriftsartikel (refereegranskat)abstract
- The introduction of several energy levels, namely color imaging, in photon counting X-ray image sensors is a trade-off between circuit complexity and spatial resolution. In this paper we propose a pixel architecture that has full resolution for the intensity and uses sub-sampling for the energy spectrum. The results show that this sub-sampling pixel architecture produces images with an image quality which is, on average, 2.4 dB (PSNR) higher than those for a single energy range architecture and with half the circuit complexity of that for a full sampling architecture.
|
|
| 16. |
- Lundgren, Jan, 1977-
(författare)
-
Behavioral Level Simulation Methods for Early Noise Coupling Quantification in Mixed-Signal Systems
- 2005
-
Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- In this thesis, noise coupling simulation is introduced into the behavioral level. Methods and models for simulating on-chip noise coupling at a behavioral level in a design flow are presented and verified for accuracy and validity. Today, designs of electronic systems are becoming denser and more and more mixed-signal systems such as System-on-Chip (SoC) are being devised. This raises problems when the electronics components start to interfere with each other. Often, digital components disturb analog components, introducing noise into the system causing degradation of the performance or even introducing errors into the functionality of the system. Today, these effects can only be simulated at a very late stage in the design process, causing large design iterations and increased costs if the designers are required to return and make alterations, which may have occurred at a very early stage in the process. This is why the focus of this work is centered on extracting noise coupling simulation models that can be used at a very early design stage such as the behavioral level and then follow the design through the various design stages. To realize this, SystemC is selected as a platform and implementation example for the behavioral level models. SystemC supports design refinement, which means that when designs are being refined and are crossing the design levels, the noise coupling models can also be refined to suit the current design. This new way of thinking in primarily mixed-signal designs is called Behavioral level Noise Coupling (BeNoC) simulation and shows great promise in enabling a reduction in the costs of design iterations due to component cross-talk and simplifies the work for mixed-signal system designers.
|
|
| 17. |
- Lundgren, Jan, et al.
(författare)
-
Evaluation of Mixed-Signal Noise Effects in Photon Counting X-Ray Image Sensor Readout Circuits
- 2006
-
Ingår i: Nuclear Instruments and Methods in Physics Research Section A. - : Elsevier BV. - 0168-9002 .- 1872-9576. ; 563:1, s. 88-91
-
Tidskriftsartikel (refereegranskat)abstract
- In readout electronics for photon counting pixel detectors, the tight integration between analog and digital blocks causes the readout electronics to be sensitive to on-chip noise coupling. This noise coupling can result in faulty luminance values in grayscale X-ray images, or as color distortions in a color X-ray imaging system. An exploration of simulating noise coupling in readout circuits is presented which enables the discovery of sensitive blocks at as early a stage as possible, in order to avoid costly design iterations. The photon counting readout system has been simulated for noise coupling in order to highlight the existing problems of noise coupling in X-ray imaging systems. The simulation results suggest that on-chip noise coupling should be considered and simulated in future readout electronics systems for X-ray detectors.
|
|
| 18. |
- Lundgren, Jan, et al.
(författare)
-
Power Distribution and Substrate Noise Coupling Investigations on the Behavioral Level for Photon Counting Imaging Readout Circuits
- 2007
-
Ingår i: Nuclear Instruments and Methods in Physics Research Section A. - : Elsevier BV. - 0168-9002 .- 1872-9576. ; 576:1, s. 113-117
-
Tidskriftsartikel (refereegranskat)abstract
- In modern mixed-signal system design, there are increasing problems associated with noise coupling caused by switching digital parts to sensitive analog parts. As a consequence, there is a growing necessity to understand these problems. In order to avoid costly design iterations, noise coupling simulations should be initiated as early as possible in the design chain. The problems associated with on-chip noise coupling have been discovered in photon counting pixel detector readout systems, where the level of integration of analog and digital circuits is very high on a very small area, and it would appear that these problems will continue to increase for future system designs in this field. This paper deals with the functionality of utilizing behavioral level models for simulating noise coupling in these readout systems. The methods and models are described and simulation results are shown for a photon counting pixel detector readout system.
|
|
| 19. |
- Lundgren, Jan, et al.
(författare)
-
Simplified Gate Level Noise Injection Models for Behavioral Noise Coupling Simulation
- 2005
-
Ingår i: Proceedings of the 2005 European Conference on Circuit Theory and Design. - Piscataway, NJ, USA : IEEE conference proceedings. - 0780390660 - 9780780390669 ; , s. 345-348
-
Konferensbidrag (refereegranskat)abstract
- In CMOS digital logic, there are two major noise sources requiring consideration. These are a circuit´s power supply current and its noise current injected into the substrate of the circuit. This paper proposes a method for modeling and estimating the noise current injected into the substrate by capacitive coupling in digital circuits. The simplicity of the model and the reduction of details in the technology libraries facilitates behavioral level noise coupling simulation. The model is exemplified and evaluated for a simple NOT gate test case, for which the accuracy and simplicity of the models show great promise for simulation at the behavioral level.
|
|
| 20. |
- Lundgren, Jan, 1977-
(författare)
-
Simulating Behavioral Level On-Chip Noise Coupling
- 2007
-
Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- In this thesis, noise coupling simulation is introduced into the behavioral level. Methods andmodels for simulating on-chip noise coupling at the behavioral level in a design flow are presentedand verified for accuracy and validity. Today, designs of electronic systems are becoming denserand more and more mixed-signal systems such as System-on-Chip (SoC) are being devised. Thisraises problems when the electronics components start to interfere with each other. Often, digitalcomponents disturb analog components, introducing noise into the system causing degradation ofthe performance or even introducing errors into the functionality of the system.Today, these effects can only be simulated at a very late stage in the design process, causinglarge design iterations and increased costs if the designers are required to return and makealterations, which may have occurred at a very early stage in the process.This is why the focus of this work is centered on extracting noise coupling simulation modelsthat can be used at a very early design stage, such as at the behavioral level and then follow thedesign through the various design stages. To achieve this, SystemC is selected as a platform andimplementation example for the behavioral level models. SystemC supports design refinement,which means that when designs are being refined and are crossing the design levels, the noisecoupling models can also be refined to suit the current design.This new method of thinking in primarily mixed-signal designs is called Behavioral levelNoise Coupling (BeNoC) simulation and shows great promise in enabling a reduction in the costsof design iterations due to component cross-talk and simplifies the work for mixed-signal systemdesigners.
|
|
