Temat: High Dynamic Range - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Application of the HDR imaging in vehicles’ video tracking systems
Autorzy:: Mazurek, P.
Okarma, K.
Powiązania:: https://bibliotekanauki.pl/articles/393309.pdf
Data publikacji:: 2010
Wydawca:: Polskie Stowarzyszenie Telematyki Transportu
Tematy:: lokalizacja pojazdów
inteligentne systemy transportowe
ITS
High Dynamic Range Images
HDRI
vehicles tracking
intelligent transport system (ITS)
high dynamic range images
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.
Źródło:: Archives of Transport System Telematics; 2010, 3, 4; 32-36
1899-8208
Pojawia się w:: Archives of Transport System Telematics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: High dynamic range imaging by perceptual logarithmic exposure merging
Autorzy:: Florea, C.
Vertan, C.
Florea, L.
Powiązania:: https://bibliotekanauki.pl/articles/330053.pdf
Data publikacji:: 2015
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: logarithmic image processing
human visual system
high dynamic range
logarytmiczne przetwarzanie obrazu
system wizualny człowieka
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.
Źródło:: International Journal of Applied Mathematics and Computer Science; 2015, 25, 4; 943-954
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

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
Powiązania:: https://bibliotekanauki.pl/articles/173642.pdf
Data publikacji:: 2019
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: high dynamic range image
no-reference quality metric
tensor domain
curvature analysis
quality-related label feature matrix
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.
Źródło:: Optica Applicata; 2019, 49, 4; 527-543
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

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.
Powiązania:: https://bibliotekanauki.pl/articles/362567.pdf
Data publikacji:: 2009
Wydawca:: Instytut Fizyki Budowli Katarzyna i Piotr Klemm
Tematy:: oświetlenie
nieboskłon
izohelia
HDR
fotografia o szerokim zakresie dynamiki
symulacje komputerowe
lighting
sky
isohel
High Dynamic Range
computer simulation
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.
Źródło:: Fizyka Budowli w Teorii i Praktyce; 2009, T. 4; 37-44
1734-4891
Pojawia się w:: Fizyka Budowli w Teorii i Praktyce
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Zastosowanie techniki HDR do obrazów pozyskiwanych z sektorowego sonaru skanującego
Application of HDR image method for sector scanning sonar images
Autorzy:: Duda, J.
Powiązania:: https://bibliotekanauki.pl/articles/209905.pdf
Data publikacji:: 2011
Wydawca:: Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
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)
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.
Źródło:: Biuletyn Wojskowej Akademii Technicznej; 2011, 60, 3; 291-306
1234-5865
Pojawia się w:: Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: The evaluation of the current state of EHF-sensors quality in the technical systems and its improvement
Autorzy:: Chovnyuk, Y. V.
Ivanov, E. A.
Dovhaljuk, V. B.
Shyshyna, M. A.
Gumenjuk, Y. O.
Sivak, I. N.
Powiązania:: https://bibliotekanauki.pl/articles/114875.pdf
Data publikacji:: 2019
Wydawca:: Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:: aperture
coaxial line
dynamic range of the evaluation
extremely high frequency sensors
function of the entropy evaluation
scale of the entropy evaluation
oceny entropii
czujnik
funkcja oceny entropii
Opis:: In the article the function and the scale for the entropy evaluation of the current state of extremely high frequency (EHF-) sensors quality in the various technical systems which fits the requirements of universality and maximal independency from the human factor are offered. One may see such EHF-sensors for the analysis of the quick transformations of the biological liquids properties. It’s high lighted that the available methods of the determination of technical systems’ quality have essential flaws which consist in both subjectivism because the dominant role in the evaluation belongs to experts and legitimacy of providing them properties of universality which was proved by nobody. The scheme of EHF-sensor is analyzed for which one may create an analytical model. The problem of the fields’ determination at the working region of such sensor is discussed. The presented scheme is possible to use for the mathematical model and just for that part of the problem which is devoted to the transformation of the properties of the object. The results of calculation of components of electromagnetic field at the working space of EHF-sensor are discussed. One may estimate the sizes of this space. The offered function of the quality evaluation, the parameter of which is the quantity of own information of the explored sensor, provides the declared universality approach according to the principles of the information theory. The conformity to all requirements for the functions of the evaluation of the quality: continuity, monotonic and smoothness over the whole range of definition regardless of the probability distribution function, which is measured by the random value EHF-sensor was proved. The proposed scale of the entropy evaluation of the quality fits to standard settings of the diagnostic of the technical systems and has three sub ranges which determine the state of the EHF-sensors: good state, up state, and down state. Unlike the existing psychophysical scales the offered scale has dynamic range of the evaluation so the limits of the sub ranges will automatically change depending on the regulatory and technical requirements for the state of the explored EHF-sensor. Such approach provides adaptation of the scale to specific requirements which gives a chance to evaluate the qualitative state of the object more reliably. The results of modeling of the qualitative state of the sensor are given. The possible practical application of the offered function and scale is usage in the systems of monitoring and diagnostic for determination of the current qualitative state of the explored technical system, as well.
Źródło:: Zeszyty Naukowe. Quality. Production. Improvement; 2019, 2 (11); 26-40
2544-2813
Pojawia się w:: Zeszyty Naukowe. Quality. Production. Improvement
Dostawca treści:: Biblioteka Nauki

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