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Robust structure from motion under weak perspective

Robust structure from motion under weak perspective

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International Symposium on 3D Data Processing Visualization and Transmission

作者： L. Hajder D. Chetverikov I. van Vajk Budapest Hungary Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

It is widely known that, for the affine camera model, both shape and motion data can be factorized directly from the measurement matrix constructed from 2D image points coordinates. However, classical algorithms for structure from motion (SfM) are not robust: measurement outliers, that is, incorrectly detected or matched feature points can destroy the result. A few methods to robustify SfM have already been proposed. Different outlier detection schemes have been used. We examine an efficient algorithm by Trajkovic et al. (1997) who use affine camera model and the least median of squares (LMedS) method to separate inliers from outliers. LMedS is only applicable when the ratio of inliers exceeds 50%. We show that the least trimmed squares (LTS) method is more efficient in robust SfM than LMedS. In particular, we demonstrate that LTS can handle inlier ratios below 50%. We also show that using the real (Euclidean) motion data results in a more precise SfM algorithm that using the affine camera model. Based on these observations, we propose a novel robust SfM algorithm and discuss its advantages and limits. The proposed method and the Trajkovic procedure are quantitatively compared on synthetic data in different simulated situations. The methods are also tested on synthesized and real video sequences.

关键词： Robustness Cameras Computer vision Shape measurement Motion measurement Video sequences Automation Coordinate measuring machines Motion detection Computational modeling

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Distance learning - how to use this new didactic method in education of electronics engineering?

Distance learning - how to use this new didactic method in e...

引用

Electronic Components and technology Conference (ECTC)

作者： Z. Illyefalvi-Vitez P. Gordon Department of Electronics Technology Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Distance learning (DL) is an instructional delivery system that connects learners with educational resources. In microelectronics and microsystems interconnection and packaging technology, the preparation of electronics engineers for the ever growing requirements is especially a challenge for today's education, and there is an essential need for the application of advanced curricula and teaching methods. In the present paper, the driving forces for the development of curricula and didactic methods are outlined, followed by the detailed discussion of the needs for and the applicability of distance learning. Then, an example is provided for the application of the Internet-based performance centered instructions (IPCI) model for providing Web-based DL experiments in the special field of surface mounting technology (SMT) for students of electrical engineering and graduate engineers interested in microelectronics packaging and interconnection technology. Finally conclusions are drawn and further efforts are outlined.

关键词： Computer aided instruction Surface-mount technology Continuing education Microelectronics Knowledge engineering Gold Joining processes Web sites Electronics packaging Educational technology

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Investigations on noise-suppression effects of nonlinear feed-back loops in microwave oscillators

Investigations on noise-suppression effects of nonlinear fee...

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Microwave, MTT-S International Symposium

作者： T. Banky T. Berceli Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Full-scale calculations are described regarding the phase noise suppression effects of an additionally inserted highly nonlinear feedback loop in microwave oscillators. Calculations are done in two fields both focusing on the measure of reduction in the noise level. One results in significant reduction of the noise added by internal flicker noise sources of the active device, while the other shows the effect of nonlinear loop over the incident noises coming from the environment. Results confirming theoretical background of these effects are also reported.

关键词： Microwave oscillators Phase noise 1f noise Circuit noise Working environment noise Optical resonators Active noise reduction Circuit stability Radio frequency Low-frequency noise

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Semiconductor optical amplifiers for all-optical wavelength conversion

Semiconductor optical amplifiers for all-optical wavelength ...

引用

International Conference on Transparent Optical Networks

作者： G. Kovacs E. Udvary T. Berceli Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

All-optical wavelength conversion is one of the key functionalities in wavelength division multiplexed (WDM) systems, where channel routing is desired without any limitation. Semiconductor optical amplifiers offer several possible solutions for this functionality in the optical domain. Different possible solutions are compared, pointing out the advantages and disadvantages of each. Then, a simple, but most promising, method, cross-gain modulation, is investigated through performance measurement results. The saturation of the amplifier, conversion nonlinearity and signal extinction ratio after conversion are also investigated and presented.

关键词： Semiconductor optical amplifiers Optical wavelength conversion Wavelength division multiplexing Wavelength routing Stimulated emission Optical modulation Optical saturation Measurement Optical amplifiers Extinction ratio

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X-ray inspection systems and applications

X-ray inspection systems and applications

引用

International Spring Seminar on Electronics technology

作者： R. Kovacs Department of Electronics Technology Budapest University슠of슠Technology슠and슠Economics Hungary

Nowadays, X-ray applications are more and more important for electrical technologies. The ICs are smaller and more complex than before. Area array packages (ball grid array, chip scale package, quad flat pack, and flip chip) are widely used. These devices cover their joints and optical testers are unsuitable for checking them. Only X-ray inspection systems are suitable for checking these hidden joints. The same problem appears in multilayer carriers, where their upper layer hides the inner layers and we can only check them if we can see through the upper layer. Many components have opaque packages and we can see into the package with X-ray systems without destroying it. We can check mechanical devices (for example transformers, relays with plastic package, springs, contacts, etc.) In conclusion, application examples are presented, illustrating how we can use X-ray inspection systems to see through and into the electronic and/or electromechanical structures, and how to check hidden joints, hidden wires, and mechanical devices.

关键词： Inspection Electronics packaging Chip scale packaging X-ray applications Flip chip Optical devices Testing Nonhomogeneous media Transformers Relays

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Effect of patterned copper layer on selective polymer removal by 355 nm laser

Effect of patterned copper layer on selective polymer remova...

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IEEE Conference on Polymers and Adhesives in Microelectronics and Photonics (POLYTRONIC)

作者： B. Balogh P. Gordon R. Berenyi Z. Illyefalvi-Vitez Department of Electronics Technology Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

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Generalization of topology preserving maps: a graph approach

Generalization of topology preserving maps: a graph approach

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International Joint Conference on Neural Networks (IJCNN)

作者： A. Barsi Department of Photogrammetry and Geoinformatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

The work presents a novel algorithm, which is based on the self-organizing map (SOM) method. The combination of an undirected acyclic graph with the Kohonen learning rule results the efficient self-organizing neuron graph (SONG) algorithm. It has two modi: one is based on the adjacency information of the neuron graph, the other integrates an all-pair shortest path function, which permanently updates a generalized distance matrix. The newly developed SONG techniques were involved in pattern recognition tasks, where they proved their efficiency and flexibility.

关键词： Neurons Organizing Lattices Mathematical model Paper technology Pattern recognition Books Network topology Artificial neural networks Mathematics

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Common platform for bipotentiostatic biocatalytic sensors and DNA sensors with electronically addressed immobilization

Common platform for bipotentiostatic biocatalytic sensors an...

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International Spring Seminar on Electronics technology

作者： H. Santha G. Harsanyi B. Sinkovics A. Takacs Department of Electronics Technology Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

A new miniaturized electrochemical cell has been designed and constructed by utilization of different electronics technologies. The 25-50 /spl mu/l capacity of the cylindrical shaped electrochemical cell has been built up by cutting circles in 5-10 overlapping layers of 400 /spl mu/m thick Teflon foil. This multilayer structure enables very flexible solutions for inlet and outlet of different materials into the electrochemical cell. The number of working electrodes of the biosensor substrates can vary between 1-80. The reference electrode has been made of a silver wire. The circular symmetry of the counter and reference electrodes and the pattern of the working electrode array allows bipotentiostatic measurements, thus, this flexible platform is suitable for a wide range of experiments of both bipotentiostatic biocatalytic sensors and DNA sensors with electronically addressed immobilization.

关键词： Biosensors DNA Sensor arrays Molecular biophysics Electrodes Cells (biology) Biochemistry Nonhomogeneous media Laboratories Biological materials

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Will IPv6 bring better security?

Will IPv6 bring better security?

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EUROMICRO Conference

作者： S. Szigeti P. Risztics Centre of Information Technology Budapest University슠of슠Technology슠and슠Economics Hungary

The deployment of the next generation Internet protocol (IPv6) has already started. There were great expectations about the features of the new protocol, one of which was better network security. IPv6 provides network level security via IPSec. While this is an obvious improvement in security, its universal usability is still questionable. This work examines the security aspects of IPv6, whether it changes the security of the Internet.

关键词： Protocols Internet Information security Network address translation IP networks Cryptography TCPIP Quality of service Authentication Information technology

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Parameterized complexity of constraint satisfaction problems

Parameterized complexity of constraint satisfaction problems

引用

Annual IEEE Conference on Computational Complexity

作者： D. Marx Department of Computer Science and Information Theory Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

We prove a parameterized analog of Schaefer's Dichotomy Theorem: we show that for every finite Boolean constraint family F, deciding whether a formula containing constraints from F has a satisfying assignment of weight exactly k is either fixed-parameter tractable (TPT,) or W[l]-complete. We give a simple characterization of those constraints that make the problem fixed-parameter tractable. The special cases when the formula is restricted to be bounded occurrence, bounded treewidth or planar are also considered, it turns out that in these cases the problem is in FPT for every constraint family, F.

关键词： Polynomials Constraint theory Computational complexity Constraint optimization Turing machines Complexity theory

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