Temat: high dynamic - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Compression of high dynamic infrared image using auto aggregation algorithm
Autorzy:: Fidali, M.
Jamrozik, W.
Tematy:: infrared image
compression
enhancement
high dynamic; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/114701.pdf Link otwiera się w nowym oknie
Opis:: The article presents a method of compression of High Dynamic Range of infrared image and its details enhancement. The method is based on aggregation of partial images with different ranges of pixel values generated using a weighting function. Aggregation of images could be performed according to proposed scheme with use of the optimal algorithm selected by user. Preliminary results shown that the method can reveal previously hidden details in the original image.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Application of the HDR imaging in vehicles’ video tracking systems
Autorzy:: Mazurek, P.
Okarma, K.
Tematy:: lokalizacja pojazdów
inteligentne systemy transportowe
ITS
High Dynamic Range Images
HDRI
vehicles tracking
intelligent transport system (ITS)
high dynamic range images; Pokaż więcej
Wydawca:: Polskie Stowarzyszenie Telematyki Transportu
Powiązania:: https://bibliotekanauki.pl/articles/393309.pdf Link otwiera się w nowym oknie
Opis:: Video systems are used in Intelligent Transportation Systems for vehicles’ tracking. Cameras typically used in these systems are characterized by relatively low dynamic range which is only a fragment of the dynamic range of the human eye. In order to adapt to the lighting conditions the cameras feature dynamic changes of the gain and exposure. For vehicles there is a very wide range of the observed brightness of details because of the variety of vehicles’ colors and the presence of elements reflecting light in different ways, as well as changing lighting conditions. This means that even if the camera is able to capture the relevant dynamic range, there is a restriction of the distinguishability of details, which is essential in the process of detecting the location of vehicles. The use of HDR imaging techniques based on various exposures helps to increase the dynamic range and improves the accuracy of vehicles’ positions estimation.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: High dynamic range imaging by perceptual logarithmic exposure merging
Autorzy:: Florea, C.
Vertan, C.
Florea, L.
Tematy:: logarithmic image processing
human visual system
high dynamic range
logarytmiczne przetwarzanie obrazu
system wizualny człowieka; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Powiązania:: https://bibliotekanauki.pl/articles/330053.pdf Link otwiera się w nowym oknie
Opis:: In this paper we emphasize a similarity between the logarithmic type image processing (LTIP) model and the Naka–Rushton model of the human visual system (HVS). LTIP is a derivation of logarithmic image processing (LIP), which further replaces the logarithmic function with a ratio of polynomial functions. Based on this similarity, we show that it is possible to present a unifying framework for the high dynamic range (HDR) imaging problem, namely, that performing exposure merging under the LTIP model is equivalent to standard irradiance map fusion. The resulting HDR algorithm is shown to provide high quality in both subjective and objective evaluations.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: No-reference quality metric for high dynamic range imaging system based on curvature analysis in tensor domain
Autorzy:: Jiang, Gangyi
Yu, Jiaowen
Yu, Mei
Song, Yang
Peng, Zongju
Chen, Fen
Tematy:: high dynamic range image
no-reference quality metric
tensor domain
curvature analysis
quality-related label feature matrix; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/173642.pdf Link otwiera się w nowym oknie
Opis:: High dynamic range imaging systems can offer a more complete representation of scene, aiming to capture all brightness information of a visible range of scene, even in extreme lighting conditions.This paper proposes a no-reference quality metric for high dynamic range image (HDRI), in which a combination of tensor decomposition and curvature analysis is used to construct an efficient featureset that is sensitive to degradation levels of patches in HDRIs. Tensor decomposition maintains the majority of color information of an HDRI, and the geometric structure information of the HDRI is then extracted by a curvature analysis. A quality-related label feature matrix is subsequently defined and obtained by using a feature set and a sparse dictionary with quality-related labels. Then, the multi-dimensional local feature set of the HDRI is determined from the quality-related label feature matrix. Finally, the local feature set and other global feature set are pooled to predict the quality of the HDRI. The prediction performance of the proposed metric is verified by three public test databases, and the experimental results indicate that both its Pearson linear correlation coefficientand Spearman rank-order correlation coefficient are better than those of other no-reference metrics.The proposed metric produces statistically better assessment results, implying a higher consistency with human visual perception.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: A study of optimization of Alpha-Beta-Gamma-Eta filter for tracking a high dynamic target
Autorzy:: Jeong, T.
Pan, B.F.
Njonjo, A.W.
Tematy:: integrated navigation
Alpha-Beta-Gamma filter
Kalman filter
high dynamic target
ships tracking
target dynamics
Jerky Model
ARPA; Pokaż więcej
Wydawca:: Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Powiązania:: https://bibliotekanauki.pl/articles/116199.pdf Link otwiera się w nowym oknie
Opis:: The tracking filter plays a key role in accurate estimation and prediction of maneuvering vessel’s position and velocity. Different methods are used for tracking. However, the most commonly used method is the Kalman filter and its modifications. The Alpha-Beta-Gamma filter is one of the special cases of the general solution pro-vided by the Kalman filter. It is a third order filter that computes the smoothed estimates of position, velocity and acceleration for the nth observation, and also predicts the next position and velocity. Although found to track a maneuvering target with a good accuracy than the constant velocity, Alpha-Beta filter, the Alpha-Beta-Gamma filter does not perform impressively under high maneuvers such as when the target is undergoing changing accelerations. This study, therefore, aims to track a highly maneuvering target experiencing jerky motions due to changing accelerations. The Alpha-Beta-Gamma filter is extended to include the fourth state that is, constant jerk to correct the sudden change of acceleration in order to improve the filter’s performance. Results obtained from simulations of the input model of the target dynamics under consideration indicate an improvement in performance of the jerky model, Alpha-Beta-Gamma-Eta, algorithm as compared to the constant acceleration model, Alpha-Beta-Gamma in terms of error reduction and stability of the filter during target maneuver.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Porównanie wybranych technik przetwarzania obrazów cyfrowych dla potrzeb określania zewnętrznych warunków oświetleniowych
Comparison of selected techniques of digital images conversion for determination of external daylighting conditions
Autorzy:: Górko, M.
Heim, D.
Szczepańska, E.
Tematy:: oświetlenie
nieboskłon
izohelia
HDR
fotografia o szerokim zakresie dynamiki
symulacje komputerowe
lighting
sky
isohel
High Dynamic Range
computer simulation; Pokaż więcej
Wydawca:: Instytut Fizyki Budowli Katarzyna i Piotr Klemm
Powiązania:: https://bibliotekanauki.pl/articles/362567.pdf Link otwiera się w nowym oknie
Opis:: W pracy omówiono dwie techniki opracowania obrazów cyfrowych dla numerycznych analiz oświetlenia dziennego. Porównano technikę o szerokim zakresie tonalnym HDR (bezpośrednia) z techniką pojedynczych obrazów przekształcanych na izohelie (pośrednia) w skali szarości, o znanej jasności odniesienia. Zastosowanie obu metod przedstawiono na przykładzie obrazów nieboskłonów uzyskanych dla wybranych dni marca i kwietnia 2009 roku nad miastem Łodzią. Na podstawie obrazów opracowano mapy luminancji półsfery niebieskiej i porównano je pod względem jakościowym otrzymanych wyników. Stwierdzono, że w przypadku techniki izoheli możliwe jest łatwe regulowanie zakresem tonalnym oraz uzyskanie dowolnego stopniowania bez względu na wielkość natężenia oświetlenia. Ponadto nie wymaga ona stosowania stosunkowo drogich zestawów do bezpośredniego pomiaru luminancji. Natomiast technika oparta na obrazach HDR jest znacznie bardziej uniwersalna pod warunkiem posiadania pełnego zestawu pomiarowego.
Two outdoor methods of daylight availability determination are described in a paper. The results obtained using HDR (High Dynamic Range) and Isohel methods for clear sky condition are presented and compared. Both method can be used for future work concerns investigations of daylight availability in Poland.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Zastosowanie techniki HDR do obrazów pozyskiwanych z sektorowego sonaru skanującego
Application of HDR image method for sector scanning sonar images
Autorzy:: Duda, J.
Tematy:: przetwarzanie obrazów
obraz sonarowy
sonar skanujący
histogram
wzmocnienie sygnału
rozróżnialność obiektów
HDR
image processing
sonar image
sector scanning sonar
object visibility
High Dynamic Range Image (HDRI); Pokaż więcej
Wydawca:: Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Powiązania:: https://bibliotekanauki.pl/articles/209905.pdf Link otwiera się w nowym oknie
Opis:: Obrazy pozyskiwane za pomocą sonarów sektorowych mają często ograniczoną głębokość bitową do ośmiu bitów. Powoduje to szereg restrykcji związanych z percepcją obrazów sonarowych, jak również z późniejszym ich przetwarzaniem. W artykule przedstawione zostały badania związane z zastosowaniem techniki uzyskiwania obrazów o szerokim zakresie tonalnym (High Dynamic Range) do obrazów sonarowych. Zastosowanie techniki HDR pozwala na zwiększenie ilości informacji przenoszonej przez obraz sonarowy i brak konieczności wyboru między lepszą reprezentacją dna czy też obiektów się na nim znajdujących.
The images obtained with sector scanning sonar have often bit depth limited to eight bits. It causes a lot of limitations related with sonar images perception and also later with their transformation. Already during sonar images registration process, the operator must decide what is more important to him. The operator must choose between good visibility of bottom or objects located on it. Such is a characteristic property of low dynamic range (LDR) images. In other words, operator has to choose between better representation of bottom or the objects, what is realized by changing the gain of the acoustic signal. Selection between better representation of the bottom or the objects is performed by increasing or reducing the strengthening of the acoustic wave generated by the sonar transducer. Increase in the strength of the acoustic wave causes additional distortion on the sonar image which can be observed particularly near the sonar transducer. These distortions are also produced by the presence of the object, growing if the object is nearby the sonar transducer. If the sonar acoustic wave is too strong, then induced distortions cause poor visibility of sonar images. Using the transformations of the low dynamic range sonar images to improve the poor visibility of particular elements often causes an additional loss of information. As a result, the image can become unreadable. Unfortunately, there is no possibility of artificial enhancement of the information contained in the image. The article presents the research related to HDR images using for the sonar images. The HDR method is used in photography to improve their perception. Using images with different value of exposition can be presented by both dark and bright elements. HDR images characterize a good object resolution. Nowadays, HDR images were used mainly in photography. In the article, the HDR method was applied for the first time to the sector scanning sonar images. In the sonar HDR images, the exposure value was replaced by the strength of the sonar acoustic signal. Using the HDR method in photography increases the aperture or decreases photo array sensitivity effect on the value of exposition. Inversely, to reduce exposure we must decrease the aperture or increase sensitivity of the matrix. For the sonar images there is only one parameter influencing the exposure value, namely the gain of the sonar acoustic signal. For the HDR sonar images, increasing exposure is equivalent to reduction of the gain acoustic signal and decreasing exposure with an enlargement of the gain acoustic signal. Using three images of different exposure during a single sonar registration, we obtain the high dynamic range sonar image. In contrary to the side scan sonar, which has to be towed several times over the same area, it allows to locate the sector scanning sonar on a tripod at the bottom. For this reason, the sector scanning sonar location does not occurr the distortion associated with the movement of the vessel and waving. Because the registered sonar images are not shifted mutually, there is not necessity to match them what simplify HDR sonar images process realization. The HDR technique can also be applied to images obtained from side-scan sonar. However, the main problem to have HDR images is obtaining images from the same place and their matching. Using the HDR method allows to enlarge the quantity of information contained in sonar image by increasing the bit width of the sonar image, namely from eight to sixteen bit. Obtaining more values and regular values distribution on the HDR sonar image histogram results in no necessity of choice between better representation of bottom or object located on the sonar image.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Dynamic properties of 7000 - series aluminum alloys at large strain rates
Autorzy:: Jurczak, W.
Kyzioł, L.
Tematy:: High resistance aluminum alloys
dynamic characteristics; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/258981.pdf Link otwiera się w nowym oknie
Opis:: This paper presents test results of mechanical properties of EN AW-AlZn5Mg1Zr and EN AWAlZn5Mg1,5CuZr aluminum alloys for various tensile strain rates. Static tests were conducted with the use of MTS 810.12 tension test machine, and dynamic tests - with RSO rotary impact test machine. The work was aimed at determination of effects of strain rate and notch geometry of specimens on their material mechanical properties and damage mechanisms.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Zdolności dynamiczne w otoczeniu o dużej prędkości: Pojawienie się jako reakcja na zagrożenia
Dynamic capabilities in a high-velocity environment: The emergence as a reaction to threats
Autorzy:: Czapla, Alina
Wydawca:: Silesian University of Technology
Cytata wydawnicza:: Czapla A. (2023). Dynamic capabilities in a high-velocity environment: The emergence as a reaction to threats, Scientific Papers of Silesian University of Technology -Organization and Management Series, 188, 33-44. http://dx.doi.org/10.29119/1641-3466.2023.188.3
Opis:: National Science Centre, Poland
Purpose: The study aims to investigate the emergence of dynamic capabilities (DCs) of enterprises that have appeared as a result of threats caused by high-velocity environments. Design/methodology/approach: In the qualitative research, DCs of Polish companies were examined, to answer the question of how companies responded to turbulence in the business environment caused by the pandemic crisis. In-depth interviews with managers of 20 outstanding companies were conducted to explore the specific processes and activities, companies undertook to survive the crisis. Findings: The emergence of dynamic capabilities for distressed enterprises in a high-velocity environment referred to both lower- and higher-order DCs, companies from various industries, also small and medium-sized enterprises. Radically innovative actions by companies during the crisis were aimed mainly at survival, but also at protecting employees, customers, and society. Research limitations/implications: The study has some limitations. Firstly, only Polish enterprises were studied, and therefore the results cannot be directly applied to other countries. Second, this is an exploratory study that requires follow-up to deepen the topic to enable future quantitative research. Practical implications: Companies may use the results of this project as an incentive for developing their DCs. They can also use the examples discussed as guidance for future actions, especially in a turbulent business environment. Originality/value: The paper notes the importance of a non-routine approach to dynamic capabilities. This is important for management as a scientific discipline, but also for managers, as indicates various possible paths for DCs' development
Dostawca treści:: Repozytorium Centrum Otwartej Nauki

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Skocz do pozycji: 10.

Tytuł:: Analysis of dynamic characteristics of an experimental bench of high-pressure water fracturing assisted cutting
Autorzy:: Liu, Zhiming
Zhang, Qiang
Sun, Yuliang
Liu, Junming
Tematy:: high-pressure water fracturing
experimental bench
dynamic characteristics; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/2200892.pdf Link otwiera się w nowym oknie
Opis:: Aiming at the problem that the cutting efficiency of a drum shearer is low when mining hard coal seams, an experimental bench of high-pressure water fracturing assisted cutting is designed. Compared with normal ones, the maximum equivalent stress of the improved experimental bench is reduced by 55.38%, and the maximum total deformation is reduced by 27.23%. According to the results of dynamic response analysis, it is concluded that the experimental bench of high-pressure water fracturing assisted cutting is stable and reliable under extreme working conditions, and meets design requirements for strength and stiffness.
Dostawca treści:: Biblioteka Nauki

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