Booij O.,University of Amsterdam |
Krose B.,University of Amsterdam |
Zivkovic Z.,NXP Research
Robotics: Science and Systems | Year: 2011
Estimating the relative pose between two camera positions given image point correspondences is a vital task in most view based SLAM and robot navigation approaches. In order to improve the robustness to noise and false point correspondences it is common to incorporate the constraint that the robot moves over a planar surface, as is the case for most indoor and outdoor mapping applications. We propose a novel estimation method that determines the full likelihood in the space of all possible planar relative poses. The likelihood function can be learned from existing data using standard Bayesian methods and is efficiently stored in a low dimensional look up table. Estimating the likelihood of a new pose given a set of correspondences boils down to a simple look up. As a result, the proposed method allows for very efficient creation of pose constraints for vision based SLAM applications, including a proper estimate of its uncertainty. It can handle ambiguous image data, such as acquired in long corridors, naturally. The method can be trained using either artificial or real data, and is applied on both controlled simulated data and challenging images taken in real home environments. By computing the maximum likelihood estimate we can compare our approach with state of the art estimators based on a combination of RANSAC and iterative reweighted least squares and show a significant increase in both the efficiency and accuracy.
Van Dalen R.,NXP Semiconductors |
Heringa A.,NXP Research |
Boos P.W.M.,NXP Semiconductors |
Van Der Wal A.B.,NXP Semiconductors |
Swanenberg M.J.,NXP Semiconductors
Proceedings of the International Symposium on Power Semiconductor Devices and ICs | Year: 2010
In this work we present an alternative Hot Carrier Injection (HCI) characterisation technique for SOI based HV devices based on the analysis of the avalanche current at sub-threshold gate bias as a function of applied drain voltage (multiplication). This technique is shown to enable an accurate extraction of the electrical field distribution within the device which, when used during HCI stress, pinpoints the exact location of the charge injection without need of extra contacts, field plates or special measurement structures.
Gangwal O.P.,NXP Research |
ICCE 2010 - 2010 Digest of Technical Papers International Conference on Consumer Electronics | Year: 2010
Automatically generated depth maps from video are usually not aligned with the objects in the original image and produced at lower resolutions. We propose to apply a joint-bilateral filter to smoothen the depth map within the objects and upsample it to the original image resolution, while keeping the object edges in the depth map aligned with the original image. We performed algorithmic and ASIC specific optimizations to achieve a real-time implementation in dedicated hardware, while preserving high quality results. Upsampling depth maps from 240x135@60Hz to 1920x1080@60Hz, requires 0.35 mm2, at 200 MHz, for a dedicated hardware implementation in CMOS 45 nm technology. ©2010 IEEE.
Puliyankot V.,MESA Institute for Nanotechnology |
Piccolo G.,MESA Institute for Nanotechnology |
Hueting R.J.E.,MESA Institute for Nanotechnology |
Heringa A.,NXP Research |
And 2 more authors.
IEEE International Conference on Group IV Photonics GFP | Year: 2011
This paper demonstrates increased light emission in Si p-i-n light emitting diodes (LEDs) by changing the geometry of the device. The theory behind this, the device fabrication, electrical and optical characteristics are also presented. Reducing the injector size, decreases the diffusion current as shown by IV measurements and simulations. As a result, for a particular on- current the pn-product and hence light increases inside the active region for the new devices. The electroluminescence (EL) intensity measurements show an enhanced light emission by more than a factor of four. © 2011 IEEE.
Schober A.,University of Graz |
Ciacci M.,NXP Research |
Gebhart M.,NXP Semiconductors
Proceedings of the 12th International Conference on Telecommunications, ConTEL 2013 | Year: 2013
The near-field communication channel is mainly determined by the coupling of two resonant loop antennas and their HF system properties. Such properties change dynamically during operation, affecting significantly power transfer and communication performance. Both these effects are related to an impedance mismatch which arises due to a varying coupling factor. In this paper we present a Matlab-based network simulation model which allows to estimate impedance and contactless performance aspects as a function of coupling, and to determine appropriate impedance matching and antenna design parameters. © 2013 University of Zagreb.