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This paper presents a fully integrated current-sensing system (CSS) that is 10x more accurate than the state-of-the-art. It consists of an on-chip shunt resistor, a ΔΣ ADC and a bandgap reference (BGR), which also senses shunt temperature. For ±5A currents, it exhibits 12μA offset and ±0.25% gain error from −40 to +85°C. This level of accuracy is achieved with the help of multiple dynamic error correction...
This paper presents a comparative study on the use of interpolation based gaze estimations with low-cost web camera with built in infrared LEDs. Six polynomial models were carefully compared based on at 9 points calibration; the best average accuracy from this study among all participants is found to be 1.10 degree from the center of gaze line. The best model provides better quality when compared...
Dynamic Traffic Assignment (DTA) has become a main component of modern traffic control centres. To calibrate a DTA model the observations from the field are required. There has been increasing number of sensors and technologies which can provide these data. In this paper we briefly describe these sensors and elaborate on the various traffic data types that are used in dynamic demand calibration. The...
Vehicle positioning in infrared vehicle-to-infrastructure communication systems can be realized with the aid of signal-direction discrimination. The coming direction of the infrared signal can be acquired with high precision by comparing the sgnal strengths received by different receiving modules in the signal-direction discriminator, provided that all the receiving modules together with their amplification...
Depth sensors based on Time-of-Flight (ToF) and Phase Shifting (PS) have complementary strengths and weaknesses. ToF can provide real-time depth but limited in resolution and sensitive to noise. PS can generate accurate and robust depth with high resolution but requires a number of patterns that leads to high latency. In this paper, we propose a novel fusion framework to take advantages of both ToF...
In this paper a new voltage reference circuit concept is introduced. The presented voltage reference circuit is especially useful for low power applications. The reference circuit has two modes: the high accuracy and the low power mode. During the high accuracy mode the energy consumption is much higher than during the low power mode where accuracy is secondary. The fields of application are use cases...
Wireless localization using signal strength has been very popular in commercial applications due to the wide availability of 802.11 WiFi networks. However, signal strength information alone provides very rough location estimates. In this paper we consider supplementing the receiver of each user with a ranging unit required for accurate positioning. By allowing range-based cooperation between the users,...
In recent years, the Phasor Measurement Unit (PMU) technology is rapidly evolving towards the potential deployment also in power distribution systems (DSs). In general, this specific field of applications requires PMUs whose accuracy levels are beyond those required by the IEEE Std. C37.118. Additionally, there is the need to define the architecture of an associated calibration system capable to assess...
In this paper we investigate the effectiveness of the gaze interaction within near-to-eye display. The practical aspect of the paper is about combining an eye tracker with smart glasses. Presented research is related with the eGlasses project, which is focused on the development of an open platform in the form of multisensory electronic glasses and related interaction methods. One of the implemented...
In this study, tennis ball rotation and trajectory are analyzed quantitatively. Fourteen dots are marked on a tennis ball to detect the ball rotation, and the markers' x−y positions are detected from high-speed camera images. First, the 3-D positions of the markers are calculated. Then, the rotation matrix is calculated by using the 3-D marker positions of successive camera frames. The rotation parameters,...
Gaze movements play a crucial role in humancomputer interaction (HCI) applications. Recently, gaze tracking systems with a wide variety of applications have attracted much interest by the industry as well as the scientific community. The state-of-the-art gaze trackers are mostly non-intrusive and report high estimation accuracies. However, they require complex setups such as camera and geometric calibration...
We deal with the processing of multiview video acquired by the use of practical thus relatively simple acquisition systems that have a limited number of cameras located around a scene on independent tripods. The real-camera locations are nearly arbitrary as it would be required in the real-world Free-Viewpoint Television systems. The appropriate test video sequences are also reported. We describe...
Underground construction projects require accurate techniques for machine guidance control. This paper presents an advanced design of a fully integrated active laser target (ALT), which is employed as an optical displacement and orientation sensor. The instrument is mounted on a tunnel boring machine (TBM) and delivers the TBM's pitch and yaw angles to a remote host system. The optical arrangement...
This study focuses on a full-span calibration and detection methods of an on-wafer measurement system for quadrature voltage-controlled oscillator (QVCO). The quadrature accuracy, namely I/Q imbalances, of the QVCO was accurately measured by a high-speed oscilloscope. An on-chip calibration kit (Cal Kit) was applied to de-embed the system errors. This paper describes the test setup and calibration...
A calibration technique for SAR analog-to-digital converters is proposed in this paper which is ready to be integrated on chip. This technique is based on the integral nonlinearity (INL) test and utilizes one redundant bit and extra two quantization bits to improve the calibration accuracy. In the calibration mode, mismatch errors are saved as higher-bit level INL information and then translated to...
Implantable devices like artificial cardiac pacemakers are generally used to control irregular pulses of heart. For 10-year usage, high accuracy supply voltage is essential with the unavoidable aging of the power system to achieve near-natural beat rhythm. A Self-Calibration DC-DC Buck converter (SC-Buck) is proposed to achieve high output voltage accuracy by eliminating offset caused by mismatch...
This work presents an automatic calibration method for a vision based external underwater ground-truth positioning system. These systems are a relevant tool in benchmarking and assessing the quality of research in underwater robotics applications. A stereo vision system can in suitable environments such as test tanks or in clear water conditions provide accurate position with low cost and flexible...
In process analytical technology (PAT), partial least squares (PLS) regression has been widely used to construct calibration models for near-infrared (NIR) spectroscopy. To construct a highly accurate calibration model, wavenumber selection is crucial. In the present work, an efficient wavenumber selection method especially for PLS is proposed. The proposed method is referred to as nearest correlation...
Automatic reconstruction of 3D models from images using multi-view Structure-from-Motion methods has been one of the most fruitful outcomes of computer vision. These advances combined with the growing popularity of Micro Aerial Vehicles as an autonomous imaging platform, have made 3D vision tools ubiquitous for large number of Architecture, Engineering and Construction applications among audiences,...
Robots are often equipped with 2D laser-rangefinders (LRFs) and cameras since they complement well to each other. In order to correctly combine measurements from both sensors, it is required to know their relative pose, that is, to solve their extrinsic calibration. In this paper we present a new approach to such problem which relies on the observations of orthogonal trihedrons which are profusely...
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