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    Wyświetlanie 1-6 z 6
    Tytuł:
    A fast dehazing method with high color fidelity
    Autorzy:
    Shan, Y.
    Ge, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/174419.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    digital image processing
    atmospheric scattering
    dehazing
    Opis:
    In this paper, we present a fog image degradation model with the combination of HSI color space and the atmosphere scattering model. Based on the model, a fast dehazing method with high color fidelity has been proposed. The main advantage of the proposed method compared with others is its speed. This speed allows the method to be applied within real-time processing applications as a step of preprocessing. Another advantage is the possibility to handle both color images and gray level images. The algorithm depends only on on two parameters, and both are easy to set. Experiments on haze images demonstrate that the proposed method can achieve wonderful image visibility with a higher computing speed.
    Źródło:
    Optica Applicata; 2018, 48, 3; 515-527
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spatial light modulator design and generation of structured electromagnetic waves using digital light processors
    Autorzy:
    Yalcinkaya, F.
    Koc, T.
    Pala, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2172826.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    spatial light modulator
    digital micro-mirror device
    digital light processing
    structured electromagnetic wave
    orbital angular momentum
    hologram
    Opis:
    Spatial light modulators (SLMs) are versatile devices used for optical studies. These instruments have a wide area of application in photonics. Additionally, SLMs have potential utility in different applications, such as biomedical applications, laser based surgery for precise cutting and as optical tweezers to separate cells in a petri container. However, the high cost of SLM devices prevents their widespread use in many areas, including industrial areas and scientific research laboratories. This paper demonstrates how to design a digital light processor (DLP) based low-cost SLM and describes how to obtain structured electromagnetic waves with the designed SLM. Therefore, this research was undertaken to design and produce a low-cost SLM device for optical applications. For this purpose, two prerequisites had to be fulfilled, the first was to use suitable components of a projection device with DLP-based digital micro-mirror device (DMD), and the second was to eliminate unnecessary SLM components from the system. Finally, holographic images reflected on the SLM screen were created by using Mathematica software program to change the amplitude and phase of the electromagnetic waves in order to obtain the structured electromagnetic waves.
    Źródło:
    Optica Applicata; 2022, 52, 3; 461--479
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    SLAM algorithm without odometric sensors usage in context of different computing processor types
    Autorzy:
    Fiedeń, Mateusz
    Miotk, Michał
    Dąbek, Przemysław
    Muraszkowski, Artur
    Powiązania:
    https://bibliotekanauki.pl/articles/1189909.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    cyfrowe przetwarzanie obrazów
    SLAM
    CUDA
    brak czujników odometrycznych
    digital image processing
    absence of odometric sensors
    Opis:
    SLAM stands for a simultaneous localization and mapping. It’s used in construction of autonomic robots, designed for work in topographically unknown areas or dynamically changing environment. In its simplest form it utilizes distance sensor, lidar for example, and displacement data obtained from encoders. Thanks to application of appropriate strategies of adding next scan iterations and filtration of obtained data, it allows to create accurate maps with minimal computing power required. However, usage of encoders is not always possible, as in case of boats, legged robots or drones. To solve this problem, there’s proposed an algorithm that allows for localization and mapping in described situation, with a discussion on type of processors used by program. Because of the task specifics, it’s necessary to match many obtained simultaneously measurements with created map. For this purpose, the differences between algorithm version using only CPU, by spreading the task between different processor threads, and algorithm version that utilize graphical computing acceleration, that make calculations on many parallel CUDA cores, were checked. Both implementations were tested on the corridor inside building with results in the form of charts comparing time needed for separated iterations to complete.
    Źródło:
    Interdisciplinary Journal of Engineering Sciences; 2019, 7, 1; 28--37
    2300-5874
    Pojawia się w:
    Interdisciplinary Journal of Engineering Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Method for improving sinusoidal quality of error diffusion binary encoded fringe used in phase measurement profilometry
    Autorzy:
    Tian, Z.
    Chen, W.
    Su, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/174421.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    phase measurement profilometry
    digital-light-processing projector
    DLP projector
    error diffusion algorithm
    binary encoded grating
    Opis:
    Insufficient resolution of digital-light-processing projector will degrade the sinusoidal quality of the binary encoded fringe pattern because of less sampling points in a fringe period, which will degrade the measurement accuracy if it is used in phase measurement profilometry. Two resolutions are proposed in the paper. One is that a cylindrical lens is introduced in the projecting light path of the measurement system to improve sinusoidal quality of the binary encoded fringe by elliptical low-pass filtering of the system. The other one is that superposition of multi-frame binary encoded gratings with different microstructure is to reduce the binary image noise for improving the measurement accuracy. Simulations and experiments verify the validity of the above two methods.
    Źródło:
    Optica Applicata; 2016, 46, 2; 291-303
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Derivation of Motor Mean Phase Currents in PMSM Drives Operating with Low Switching-to-Fundamental Frequency Ratio
    Autorzy:
    Jarzebowicz, Leszek
    Powiązania:
    https://bibliotekanauki.pl/articles/1193701.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    electric drives
    high-speed drives
    current control
    current measurement
    Permanent Magnet Synchronous Drives
    Digital Signal Processing
    Opis:
    Pulse width modulation (PWM) of inverter output voltage causes the waveforms of motor phase currents to consist of distinctive ripples. In order to provide suitable feedback for the motor current controllers, the mean value must be extracted from the currents’ waveforms in every PWM cycle. A common solution to derive the mean phase currents is to sample their value at the midpoint of a symmetrical PWM cycle. Using an assumption of linear current changes in steady PWM subintervals, this midpoint sample corresponds to the mean current in the PWM cycle. This way no hardware filtering or high-rate current sampling is required. Nevertheless, the assumption of linear current changes has been recently reported as over simplistic in permanent magnet synchronous motor (PMSM) drives operating with low switching-to-fundamental frequency ratio (SFFR). This, in turn, causes substantial errors in the representation of the mean phase currents by the midpoint sample. This paper proposes a solution for deriving mean phase currents in low SFFR PMSM drives, which does not rely on the linear current change assumption. The method is based on sampling the currents at the start point of a PWM cycle and correcting the sampled value using a model-based formula that reproduces the current waveforms. Effectiveness of the method is verified by simulation for an exemplary setup of high-speed PMSM drive. The results show that the proposed method decreases the error of determining the mean phase currents approximately 10 times when compared to the classical midpoint sampling technique.
    Źródło:
    Power Electronics and Drives; 2019, 4, 39; 95-102
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization Of Current Magnitude Estimators Based On Marquardt-Levenberg Algorithm
    Autorzy:
    Łukowicz, M.
    Solak, K.
    Wicher, P.
    Wiecha, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/410595.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    signal processing
    digital filter
    magnitude estimator
    high speed overcurrent relay
    Opis:
    Digital filtering, correlation methods, time delay methods, signal differentiation are the most commonly used methods of estimating fundamental frequency orthogonal components utilized in magnitude estimators. The foundation for designing filters used in aforementioned methods are usually demanded frequency responses or signal models with their parameters to be estimated. A weak point of both approaches is frequency-domain modelling ignoring time-domain performance of the magnitude estimators. In order to fulfil the requirements of protection with the optimum speed for many different configurations, operating conditions and construction features of power systems, it is necessaiy to develop magnitude estimator design methods aimed at modelling with respect to highspeed response with simultaneous acceptable estimation accuracy in the steady state. The article discusses the implementation of Levenberg-Marquardt algorithm to optimization of current magnitude estimators designed for power system protection with the focus on estimators used in instantaneous overcurrent relays. The paper presents details of optimizing algorithm, power system model used for acquisition of signal patterns and estimator performance analyzes.
    Źródło:
    Present Problems of Power System Control; 2016, 7; 5-17
    2084-2201
    Pojawia się w:
    Present Problems of Power System Control
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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