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Tytuł:
Two-step blind phase-shifting interferometry based on the extreme value of interference and least-squares iterative algorithm
Autorzy:
Xu, Xiaoqing
Xie, Ming
Ji, Ying
Wang, Yawei
Powiązania:
https://bibliotekanauki.pl/articles/2033890.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
interferometry
phase retrieval
fringe analysis
Opis:
To improve the measuring accuracy in two-step phase-shifting interferometry (PSI), a new approach combining the extreme value of interference (EVI) and the least-squares iterative algorithm (LSIA) is proposed to extract the phase from two-frame blind phase-shifting interferograms. This method first evaluates the phase shift between two interferograms by the EVI algorithm, and then constructs the fitted interferogram by the addition of two interferograms after filtering the corresponding background intensities, so the phase with high precision can be retrieved by combining two real interferograms and this fitted interferogram using the LSIA method. The proposed algorithm expands the flexibility of the LSIA method and has the high-precision performance compared with the existing algorithms in two-step PSI. Simulation and experiment are performed to verify the feasibility of the proposed algorithm.
Źródło:
Optica Applicata; 2021, 51, 4; 513-527
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determinanty rozwoju rynku firm pożyczkowych w Polsce
Determinants of payday loan market’s development in Poland
Autorzy:
Szelągowska, Anna
Powiązania:
https://bibliotekanauki.pl/articles/2223670.pdf
Data publikacji:
2015
Wydawca:
Kancelaria Sejmu. Biuro Analiz Sejmowych
Tematy:
usury
payday loan providers
fringe banking
Opis:
Access to basic financial services is one of the factors that determine people’s participation in social and economic life. Citizens excluded from the banking sector are looking to alternative sources to satisfy their financial needs. Money is supplied by payday loan providers which offer usurious short term loans at prices many times higher than bank prices. The aim of the article is to deal with the following research question: Is the payday lending market winning the short-term loans competition with the banking sector and if yes, why is it so despite the incomparably higher total costs of payday loans? The following research hypothesis was verified in the study: the low level of financial awareness and the lack of supervision over payday loan companies in Poland contributes to usurious exploitation of the people excluded by banks, which results in a debt spiral for a considerable segment of the customers.
Źródło:
Zeszyty Prawnicze BAS; 2015, 2(46); 9-20
1896-9852
2082-064X
Pojawia się w:
Zeszyty Prawnicze BAS
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An exact approach for radius of curvature measurement in a calibration test sphere
Autorzy:
Jalife-Chavira, Jaime M.
Trujillo-Schiaffino, Gerardo
Mendoza-Villegas, Paloma G.
Salas-Peimbert, Didia P.
Anguiano-Morales, Marcelino
Corral-Martínez, Luis F.
Zendejas-Hernández, Edgar
Powiązania:
https://bibliotekanauki.pl/articles/2086760.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
keratometry
radius of curvature
diopter
cosine fringe pattern
film
Opis:
In this paper we present a technique to measure the radius of curvature of a test sphere based on the relation between acquired images of a circular cosine fringe pattern and size of virtual image formed on the calibration test surface. Radius of curvature is calculated with the exact equation proposed, using the parameters of the optical setup. Fringe pattern evaluation was performed by locating extrema indices. The mathematical formulation as well as the experimental setup and results are presented. After applying a linear fit algorithm to the data as a method of compensation, obtained results show an error within the tolerance established by the ISO 10343 specifications.
Źródło:
Optica Applicata; 2022, 52, 2; 229--242
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fringe pattern inpainting based on dual-exposure fused fringe guiding CNN denoiser prior
Autorzy:
Peng, Guangze
Chen, Wenjing
Powiązania:
https://bibliotekanauki.pl/articles/2086757.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
fringe projection profilometry
phase calculation
convolutional neural network
denoiser prior
Opis:
The intensity of some pixels of the captured fringe will be saturated when fringe projection profilometry is used to measure objects with high reflectivity, which will significantly affect the reconstruction of the measured object. In this paper, we propose a fringe pattern inpainting method based on the convolutional neural network (CNN) denoiser prior guided by additional information from a fringe captured in short exposure time. First, a binary mask obtained by Otsu algorithm from the modulation information of the short exposure fringe is used to detect the high-saturation region in the normal exposure fringe. Then, the corrected gray-scales of the region of the short exposure fringe selected by the mask are inserted in the saturated region of the normal fringe to form an initial fringe for iteration. At last, fringe pattern inpainting is achieved by using a CNN denoiser prior. The correct phase can be reconstructed from the inpainted fringes. The computer simulation and experiments verify the effectiveness of the proposed method.
Źródło:
Optica Applicata; 2022, 52, 2; 179--193
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adaptive lighting for inhomogeneous reflectivity compensation in applications for 3D shape measurements
Autorzy:
Casavola, Caterina
Pappalettera, Giovanni
Powiązania:
https://bibliotekanauki.pl/articles/174837.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
fringe projection
structured light projection
surface reflectivity
3D contouring
Opis:
Surface 3D reconstruction is a topic of great relevance and it has a wide range of applications in many fields such as mechanics, bioengineering and arts. Nowadays optical systems for 3D contouring such as those based on structured light projection are becoming more and more widespread. The possibility to get shape information without any contact with the object, in fact, is a great advantage in some fields such as, for example, cultural heritage. For this class of objects, however, the issue connected with inhomogeneous reflectivity must be taken into account. Due to the different level of reflectivity, in different areas of the object, it comes out that the contrast of the projected pattern changes and, as a direct consequence, the achievable accuracy can change from part to part. In this paper, a study on the possibility to implement an adaptive lighting algorithm is performed allowing to adapt illumination in order to compensate the local inhomogeneities in terms of surface reflectivity.
Źródło:
Optica Applicata; 2019, 49, 1; 89-99
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przeobrażenia terenów pofortecznych na przykładzie Torunia w świetle koncepcji M.R.G. Conzena
Transformations of the post-fortified areas on the example of Toruń according to the M.R.G. Conzen theory
Autorzy:
Deptuła, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/965323.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
urban morphology
fortifications of cities
transformation of urban spatial structure
fringe belt concept
morfologia miast
fortyfikacje miejskie
przeobrażenie struktury przestrzennej miast
koncepcja fringe belt
Toruń
Opis:
Zagospodarowanie terenów dawnych fortyfikacji w krajobrazie miast europejskich obejmuje zwykle reprezentacyjne budowle instytucjonalne i tereny o funkcjach publicznych. Stanowi czytelną strefę będącą świadectwem dawnej potęgi historycznych miast i podkreśla odrębność obszarów pofortecznych w ich strukturze przestrzennej. Tworzy jednocześnie przedłużenie zespołu staromiejskiego oraz zapewnia strefę wypoczynku i rekreacji dla mieszkańców aglomeracji miejskich. Przeobrażenia strefy dawnych fortyfikacji w Toruniu doprowadziły do powstania krajobrazu miejskiego, który można przyrównać do wielu miast europejskich. W artykule, na tle rozwoju nowożytnych fortyfikacji bastionowych w Europie i w Polsce, dokonano charakterystyki rozwoju fortyfikacji miejskich w Toruniu (cz. prawobrzeżnej), analizy ich późniejszych przeobra- żeń oraz zagospodarowania w kontekście koncepcji fringe belt M.R.G. Conzena.
The development of the former fortification zones in the urban landscape of European cities includes usually the representational institutional buildings and areas of public functions. It provides a clear zone which is a testimony of the power of the old historic towns, but also it emphasizes separateness of post-fortification areas in the urban spatial structure. At the same time the post-fortification development creates an extension of the old town and provides a recreation zone for urban residents. Transformations of former fortifications zone in Toruń led to the creation of the urban landscape, which can be compared to many European cities. In the paper, on the background of the development of modern bastion fortifications in Europe and Poland, the characteristics of the development of the city’s fortifications in Toruń was made (right bank part), as well as analysis of their subsequent transformation and development in the context of the concept of fringe belt by M.R.G. Conzen.
Źródło:
Acta Universitatis Lodziensis. Folia Geographica Socio-Oeconomica; 2014, 16
1508-1117
2353-4826
Pojawia się w:
Acta Universitatis Lodziensis. Folia Geographica Socio-Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Suburbanizacja a rola obszarów otaczających miasto – ujęcie teoretyczne
Suburbanization and the role of areas surrounding cities – a theoretical approach
Autorzy:
Harasimowicz, Aldona
Powiązania:
https://bibliotekanauki.pl/articles/1836341.pdf
Data publikacji:
2018-09-25
Wydawca:
Uniwersytet Opolski
Tematy:
suburbanization
suburban areas
peri-urban fringe
suburbanizacja
obszary podmiejskie
peryferia miejska
Opis:
Artykuł podejmuje problematykę rozwoju miast w kontekście powiązań tych jednostek osadniczych z obszarami bezpośrednio je otaczającymi, ze szczególnym uwzględnieniem roli terenów podmiejskich, wykształcającej się podczas procesów suburbanizacji. Na podstawie literatury przedmiotu analizie poddane zostały funkcje obszarów podmiejskich, jakie pojawiają się w trakcie zachodzących procesów urbanizacji, co pozwoliło na wskazanie specyfiki współczesnej strefy podmiejskiej.
The article deals with the problems of urban development in the context of links between cities and their surrounding areas, with a particular emphasis on the role of suburban areas in suburbanization. Based on the literature of the subject, the functions of suburban areas, which appear during the processes of urbanization, have been analyzed thoroughly, which allowed the author to indicate the specificity of the present suburban zone.
Źródło:
Studia Miejskie; 2018, 29; 115-130
2543-5302
2082-4793
Pojawia się w:
Studia Miejskie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simultaneous intensity projection for projector response computation with application to an active radiometric calibration
Autorzy:
Filio-Aguilar, Pedro-David
López-García, Lourdes
Rueda-Paz, Juvenal
Ávila-Aoki, Manuel
Powiązania:
https://bibliotekanauki.pl/articles/2172863.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
camera-projector compensation
digital fringe projection
phase retrieval
3D imaging
Opis:
One of the most important sources of errors in digital fringe projection (DFP) systems is the nonlinearity in the response of the projector when it uses the three-step phase retrieval algorithm. Thus, it is necessary to increase the accuracy without affecting the efficiency. In this sense, the radiometric rectification methods are used. In this paper, an active radiometric rectification method for digital fringe projection is proposed. This proposal consists in two improvements of traditional active techniques: first, parallel intensity projection is used to obtain the projector response which requires only four dot patterns; and second, a method is provided for the calculation of the inverse polynomial that guarantees symmetry with respect to the response of the projector. Experimental results, in a digital fringe projection system, show that the root-mean-square phase error improves 6.3 times using this proposal.
Źródło:
Optica Applicata; 2022, 52, 4; 521--533
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Policy-Making in Metropolitan Areas: The Aniene River as a Green Infrastructure between Roma and Tivoli
Autorzy:
Rizzo, Biancamaria
Powiązania:
https://bibliotekanauki.pl/articles/648472.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
Green Infrastructure
urban fringe
urban planning
urban design
urban governance
Aniene River
Opis:
The European policies acknowledge greenways and “Green Infrastructure” as strategically planned and delivered networks comprising the broadest range of green spaces and other environmental features. The Aniene River, linking the eastern suburbs of Rome to the City of Tivoli, has been envisaged in a multi-level approach as a Green-Blue Infrastructure able to hinder land use fragmentation and provide new continuity to remainders of open space. In turn, landscape is taken into account as a biodiversity reservoir, the scenery of outstanding cultural heritage and the relevant backdrop of ordinary life.
Źródło:
International Studies. Interdisciplinary Political and Cultural Journal; 2017, 19, 1
1641-4233
2300-8695
Pojawia się w:
International Studies. Interdisciplinary Political and Cultural Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Neural network model for phase-height relationship of each image pixel in 3D shape measurement by machine vision
Autorzy:
Chung, B
Powiązania:
https://bibliotekanauki.pl/articles/173298.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
machine vision
shape measurement
fringe pattern projection
phase-height relationship
neural network
Opis:
In a three-dimensional measurement system based on a digital light processing projector and a camera, a height estimating function is very important. Sinusoidal fringe patterns of the projector are projected onto the object, and the phase of the measuring point is calculated from the camera image. Then, the height of the measuring point is inferred by the phase. The phase-to-height relationship is unique at each image point. However it is nonlinearly different according to the image coordinates. It is also difficult to obtain the geometrical model because of lens distortion. Even though some studies have been performed on neural network models to find the height from the phase and the related coordinates, the results are not good because of the complex relationship. Therefore, this paper proposes a hybrid method that combines a geometric analysis and a neural network model. The proposed method first finds the phase-to-height relationship from a geometric analysis for each image pixel, and then uses a neural network model to find the related parameters for the relationship. The experimental results show that the proposed method is superior to previous neural network methods.
Źródło:
Optica Applicata; 2014, 44, 4; 587-599
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
One shot profilometry using iterative two-step temporal phase-unwrapping
Autorzy:
Du, G.
Wang, M.
Zhou, C.
Si, S.
Li, H.
Lei, Z.
Li, Y.
Powiązania:
https://bibliotekanauki.pl/articles/173912.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
phase unwrapping
composite fringe pattern
Fourier transform
two-step temporal phase-unwrapping
Opis:
This paper reviews two techniques that have been recently published for three-dimensional profilometry and proposes one shot profilometry using iterative two-step temporal phase-unwrapping by combining the composite fringe projection and the iterative two-step temporal phase unwrapping algorithm. In temporal phase unwrapping, many images with different frequency fringe pattern are needed to project, which would take much time. In order to solve this problem, Ochoa proposed a phase unwrapping algorithm based on phase partitions using a composite fringe. However, we found that the fringe order determined through the construction of phase partitions tended to be imprecise. Recently, we proposed an iterative two-step temporal phase unwrapping algorithm, which can achieve high sensitivity and high precision shape measurement. But it needs multiple frames of fringe images which would take much time. In order to take into account both the speed and accuracy of three-dimensional shape measurement, we get a new, and more accurate unwrapping method based on a composite fringe pattern by combining these two techniques. This method not only retains the speed advantage of Ochoa’s algorithm, but also greatly improves its measurement accuracy. Finally, the experimental evaluation is conducted to prove the validity of the proposed method.
Źródło:
Optica Applicata; 2017, 47, 1; 97-110
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Amerykańskie seriale typu „post-soap opera” – nowa generacja seriali telewizyjnych, lecz nie tylko w telewizji
American “Post-soap Opera” – A New Generation of TV Series not Only on Television
Autorzy:
Kaja, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/2170103.pdf
Data publikacji:
2014-04-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
American series
„post-soap opera”
collective intelligence
J.J. Abrams
Fringe
Lost
Opis:
The purpose of this article is to analyze the cultural phenomenon of new generation TV series, called „post-soap operas”. They have changed the entire formula of TV series as a genre, e.g. the way they are watched and distributed. „Post-soap operas” constitute also the main factor of the so called „collective intelligence”. In the article a new genre of TV series has been examined through the examples of two popular shows: Lost and Fringe. J.J. Abrams – the main producer of those series – is considered a visionary and genius by many. His products are perceived as the quintessence of „post-soap operas”. Popular TV series become international blockbusters and are distributed legally through television and DVD and illegally by the Internet. This phenomenon occurs also in our country – Polish subtitles for episodes of popular TV series appear on the Internet in less than 24 hours after they have been aired on American television. Internet is full of websites created by fans and TV producers aimed at sharing information and files. They also works as a opinion sharing platforms used for discussions about favorite TV shows.
Źródło:
Kultura i Edukacja; 2014, 2(102); 64-82
1230-266X
Pojawia się w:
Kultura i Edukacja
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Opis i implementacja algorytmu wyznaczania rozkładu fazy obrazów prążkowych w układzie FPGA
Hardware implementation of phase extraction algorithm in fringe pattern analysis
Autorzy:
Staszek, K.
Powiązania:
https://bibliotekanauki.pl/articles/155308.pdf
Data publikacji:
2012
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
obraz prążkowy
ekstrakcja fazy
transformacja falkowa
FPGA
fringe pattern
phase extraction
wavelet transform
Opis:
Niniejszy artykuł przedstawia opis algorytmu wyznaczania rozkładu fazy z obrazów prążkowych. Jest to jeden z kroków przetwarzania obrazów stosowanych powszechnie w profilometrii optycznej, dzięki której na podstawie zdjęcia można odtworzyć trójwymiarowy kształt obiektu. Algorytm oparty został na zespolonej transformacji falkowej i pozwala na pełną automatyzację procesu skanowania. Duży nacisk został położony na optymalizację pod kątem sprzętowej implementacji w układzie FPGA. Wykazana została dobra odporność zarówno na szumy jak i niską jakość obrazu prążkowego.
This paper presents a phase extraction algorithm used in fringe pattern analysis. It is one of steps in optical profilometry process used to obtain full three-dimensional information about the measured object shape. The algorithm is based on the complex wavelet transform and allows full automation of the process. Since the fringe patterns represent non-stationary signals, application of time-frequency analysis provides better results than the commonly used Fourier transform. Six variants of the wavelet transform (one- and two-dimensional) were simulated in order to minimise the required hardware resources in FPGA and test their robustness. As a result the one-dimensional minimised transform of variable size was chosen. A further part of the paper is focused on particular blocks of implementation. The presented wavelet coefficient computational method decreases the number of necessary operations during transform computing and enables significant reducing of memory requirements. The applied arcus tangens block with logarithmic division of approximation intervals gives correct extracted phase values in the entire four-quarter interval. The solution mentioned above leads to great minimisation of the described block without any impact on the accuracy. The last part of the paper presents processing results. The emphasis was put on the noise robustness and influence of the fringe pattern poor quality on the processing error. As it is shown, the algorithm works correctly even with only three gray levels and high noise level present in the input picture.
Źródło:
Pomiary Automatyka Kontrola; 2012, R. 58, nr 3, 3; 298-301
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deflectometry for phase retrieval using a composite fringe
Autorzy:
Liu, T.
Zhou, C.
Liu, Y
Si, S
Lei, Z.
Powiązania:
https://bibliotekanauki.pl/articles/173892.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
wavefront measurement
fringe analysis
phase retrieval
fast Fourier transform (FFT)
multifrequency heterodyne principle
Opis:
An improved deflectometry for wavefront measurement using a composite fringe is proposed to reduce the projection fringes and improve the accuracy. The single composite fringe contains four fringes in different directions. It goes through the tested objects and then is captured by a CCD camera. Two high frequency orthogonal fringe patterns and two single period orthogonal fringe patterns can be obtained from the composite fringe by fast Fourier transform. The unwrapping of the wrapped phase of the high frequency fringe is accomplished by the corresponding single period fringe using a heterodyne method. The wavefront is reconstructed by the integration of partial derivatives. Using only one fringe, the proposed method is more applicable to dynamic wavefront measurement. The experimental results demonstrate that the proposed method can retrieve the complex wavefronts more accurately.
Źródło:
Optica Applicata; 2014, 44, 3; 451-461
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatial and morphological effects of tourism urbanisation in the Łódź metropolitan area
Autorzy:
Makowska-Iskierka, Marzena
Powiązania:
https://bibliotekanauki.pl/articles/627879.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
urbanisation
tourism urbanisation
spatial aspect of the urbanisation process
metropolitan area
rural-urban fringe
tourism destinations
Opis:
The article presents the effects of urbanisation that took place from 1979 to 2004, on the space of tourism areas in the rural-urban fringe of the Łódź Metropolitan Area. The study concerns morphological changes, i.e. land use, land plot development, as well as the technological and social infrastructure of 24 destinations
Źródło:
Turyzm; 2013, 23, 2; 33-42
0867-5856
2080-6922
Pojawia się w:
Turyzm
Dostawca treści:
Biblioteka Nauki
Artykuł
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