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One critical issue in indoor human tracking is the design of map-aid algorithms that exploit indoor layout information. Most of current works adopt similar map-aid calibration techniques that eliminate invalid particles, which means particles propagating in inhumane manner. However, we find that these techniques have two serious problems in common, which we name acute sample impoverishment and observation...
Hyperspectral imaging relies on the optical properties of materials which absorb or scatter light at different wavelengths. To obtain repeatable results from a hyperspectral or any other imaging system, the system's spectral response must be characterized using optical standards against the light source used. Light sources vary in their spectral properties and their performance over time. Differences...
Full Paper — This document highlights the specification and performances of a modular generic test bench designed to test the pipe performances of Digital Beamformers Network (DBFN)
Stereo visual odometry and dense scene reconstruction depend critically on accurate calibration of the extrinsic (relative) stereo camera poses. We present an algorithm for continuous, online stereo extrinsic re-calibration operating only on sparse stereo correspondences on a per-frame basis. We obtain the 5 degree of freedom extrinsic pose for each frame, with a fixed baseline, making it possible...
Electromagnetic Compatibility (EMC) is a very important topic for any professional dealing with electronics. However, teaching EMC concepts faces several difficulties like the fact that several subjects are concerned with it, the lack of time for it or the troubles to realize the effect of interferences. After reviewing the main textbooks and literature, the authors have believed desirable to complete...
The increasing demand for live multimedia systems in gaming, art and entertainment industries, has resulted in the development of multiview capturing systems that use camera arrays. We investigate sparse (widely spaced) camera arrays to capture scenes of large volume space. A vital aspect of such systems is camera calibration, which provides an understanding of the scene geometry used for 3D reconstruction...
Self-calibrating systems are becoming more popular as increasing variability in shrinking geometries demands compensating techniques. Comparator based self-calibration is the most common base for self-compensating circuits due to its minimum overhead. If a self-test feature is added, care must be taken that the tails of the calibrated distribution are not causing false rejects. This paper presents...
In this paper, we present a new fully automatic approach for noise parameter estimation in the context of fluorescence imaging systems. In particular, we address the problem of Poisson-Gaussian noise modeling in the nonstationary case. In microscopy practice, the nonstationarity is due to the photobleaching effect. The proposed method consists of an adequate moment based initialization followed by...
An calibration algorithm of the touch-screen is researched which exploring an eliminating noise method after the analysis of linear principle. The block diagram of the touch-screen system is introduced, and the calibration program is designed based on the four-point linear calibration algorithm in this paper. An embedded system with touch-screen software is designed with the development tool ADS....
On-Line Continuous Partial Discharge (PD) measurements of medium voltage substations are an excellent way to determine the overall health of the equipment. Partial discharge measurements can provide maintenance alerts to allow scheduling of equipment outages based on actual condition data as opposed to scheduling based on time intervals. PD measurements provide information about the insulation system...
This work presents a simple approach to the correction of absolute gain errors in a tunable continuous-time bandpass Delta-Sigma modulator based on a Leslie-Singh architecture. The calibration is performed in the digital domain using the employed hardware. Thus, no additional analog circuitry overhead is added to the system. By tuning the center frequency of the analog resonator for correction, matching...
This paper proposes a novel fixed pattern noise (FPN) reduction technique for a PD-storage dual-capture image sensor based on the 4-tansistor pixel structure. The knee-point calibration method using a nonfully depleted photodiode by controlling the transfer voltage is proposed, without any modification of the pixel structure or addition of circuit components. The prototype sensor is fabricated using...
In this paper, a smart temperature sensor working at a supply voltage as low as 0.9V over the full military temperature range is presented. Low voltage operation is achieved by biasing the front-end BJT pairs with different emitter currents for two different sensing ranges, from −55°C to 30°C and from 20°C to 125°C, respectively. A second-order inverter-based ΣΔADC with dynamic element matching (DEM)...
In this paper we propose a blind deconvolution algorithm for wide field fluorescence microscopy. The 3D PSF is modeled after a parametrized pupil function. The PSF parameters are estimated jointly with the object in a maximum a posteriori framework. We illustrate the performances of our algorithm on experimental data and show significant resolution improvement notably along the depth. Quantitative...
Resolver sensor is utilized as absolute position transducer in many industrial motion-control applications where robustness and ability to operate in harsh environment is required. In real system, the quality of position and speed measurement is badly affected by the resolver errors and by the noise. In this paper, the software-based error-compensation technique is integrated into the control structure...
In order to fuse camera and odometer measurements, we first need to estimate their relative transformation through the so-called odometer-camera extrinsic calibration. In this paper, we present a two-step analytical least-squares solution for the extrinsic odometer-camera calibration that (i) is not iterative and finds the least-squares optimal solution without any initialization, and (ii) does not...
Capacitor mismatch is the linearity limiter of charge redistribution SAR ADCs. This paper aims at detecting and removing the mismatch induced missing-decision levels (MDLs), i.e., large positive DNLs; these errors lead to information loss that cannot be recovered by external calibration. A switched-capacitor based approach is proposed to avoid DC currents and reduce design overhead; the hardware modification...
An improved calibration method for a strap-down inertial navigation system (SDINS) is presented here. Calibration accuracy in conventional method is vulnerable to gyro uncertain errors such as random walk, Markov noise and dead band, etc. Earth-rate injection technique is suggested to reduce the calibration errors induced by gyro errors by replacing gyro output measurements with true earth-rate projections...
Concentric circles (C2Tag's) are planar markers which offer great advantages for detection and tracking. As the circular point-pair (CPP) is the geometric information encoded by a C2Tag, this work is focused on factorization techniques for Structure-and-Motion from multiple CPP images. Gathering all of them in a measurement matrix, two issues are addressed: how to scale the existing entries and how...
It has been shown, in previous work, that the 3D position of a line can be reconstructed from a single image in vision systems that do not possess a single viewpoint. We present a new method that, in a non-central axial catadioptric system, can achieve line spacial reconstruction from 3 or more image points, given the distance ratio of 3 points in the line (a fair assumption in, for example, structured...
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