Wyniki wyszukiwania - BazTech

1

Perceptual Colour Correlogram and Perception-based Statistical Features of Colour Texture

Bojar K.

Journal of Automation Mobile Robotics and Intelligent Systems

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2015

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Vol. 9, No. 1

12--17

EN

In this paper a novel definition and understanding of colour correlogram has been proposed. The proposed colour correlogram generalizes the spatial graylevel dependency matrix (SGLDM) to the case of colour textures. This generalization is based on perceptual colour difference measure expressed in the language of the CIELab colour space components. Application of the colour difference instead of arbitrary colour indices or colour components themselves allows to avoid colour-shuffling palletization and introduction of multidimensional objects, respectively; the proposed perceptual colour correlogram is a single 2D matrix. At the same time, a simple relation of the proposed colour correlogram to the spatial graylevel dependency matrix for graylevel textures is retained. Based on this relation it will be shown that there exists a vector of statistical features built from the perceptual colour correlogram which can be used to describe textures in perceptual terms. These statistical features and their abovementioned perceptual interpretation generalize Haralick concepts derived for the SGLDM.

2

Percepcyjny korelogram koloru i statystyczne cechy tekstury kolorowej

Bojar K.

Prace Naukowe Politechniki Warszawskiej. Elektronika

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2014

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z. 194, t. 2

693--702

PL

W niniejszym artykule zaproponowano nowy rodzaj korelogramu koloru, który uogólnia macierz współwystępowania poziomów szarości na przypadek tekstur kolorowych. Uogólnienie to jest oparte na percepcyjnej mierze różnicy koloru w przestrzeni barw CIELab. Zastosowanie różnicy koloru zamiast samego koloru pozwala uniknąć definiowania sztucznego porządku kolorów oraz wprowadzania wielu składowych macierzy współwystępowania, przy jednoczesnym zachowaniu prostej relacji do macierzy współwystępowania poziomów szarości dla tekstur w skali szarości. Dzięki istnieniu takiej relacji wykazano, że istnieje wektor cech statystycznych zbudowanych na podstawie korelogramu percepcyjnego uogólniający znane z literatury cechy obliczane na podstawie macierzy współwystępowania poziomów szarości.

EN

In this paper a new form of color correlogram generalizing the spatial graylevel dependency matrix to the case of color textures has been proposed. This generalization is based on perceptual color difference measure in the CIELab color space. Application of the color difference instead of the color itself allows to avoid color palletization and introduction of multiple-component cooccurrence matrix while retaining simple relation to the spatial graylevel dependency matrix for graylevel textures. Due to this relation it has been shown that there exists a vector of statistical features built from the perceptual color correlogram generalizing statistical features of the spatial graylevel dependency matrix known in literature.

3

Electro-elastostatic fields of dislocation in piezoelectric plate

Bojar K., Alshits. V., Nowacki J. P., Drabik A., Kotowski R.

Przegląd Elektrotechniczny

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2011

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R. 87, nr 3

17-20

EN

We present in a form of 20 color-coded plots the results of computer simulations of electromechanical properties of a thin piezoelectric plate with a generalized linear defect. A typical example of a device with such plate is an immersion transducer in which one side of the active piezoelectric layer is clamped to a substrate and the other is mechanically free. Therefore we restrict ourselves to mixed boundary conditions.

PL

Prezentujemy wyniki w postaci kolorowych wykresów z komputerowych symulacji właściwości elektromechanicznych cienkiej płyty piezoelektrycznej z uogólnionym defektem liniowym. Przykładem urządzenia z taką płytą jest przetwornik zanurzeniowy, w którym jedna strona warstwy aktywnej jest zamocowana do substratu, a druga strona jest swobodna. Dlatego ograniczamy się do mieszanych warunków brzegowych.

4

Analysis of temporal variations of dynamic textures by means of the SGLDM with application to EIT solar images

Bojar K., Nieniewski M.

Machine Graphics and Vision

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2008

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Vol. 17, No. 3

219-247

EN

The paper discusses applicability of texture analysis methods to Extreme-Ultraviolet Imaging Telescope (EIT) images obtained from the SOHO mission, and in particular analyses of the solar texture by means of the Spatial Gray Level Dependence Matrices (SGLDMs). Based on the observations, a theoretical parametric model is proposed for the SGLDM. Subsequently, the Haralick features are computed directly for the time sequence of preprocessed images, as well as and for the proposed model of the SGLDM. Time evolution of model parameters as well as measures of goodness fit of the model to image data for the period of one year is presented. The results obtained confirm the correctness of the model. In view of the simplicity of the model, it gives remarkably good results. A new method for solar limb extraction is described in the Appendix. The method is superior to those presented in the literature since it uses no external parameters, such as thresholds.

5

Modelling the spectrum of the fourier transform of the texture in the solar EIT images

Bojar K., Nieniewski M.

Machine Graphics and Vision

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2006

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Vol. 15, No. 3/4

285-295

EN

We present a phenomenological parametric model for the spectrum of the discrete Fourier transform [DFT] of the images obtained from the Extreme UV Imaging Telescope [EIT] of the SOHO mission. As this spectrum decays very fast, we model its logarithm rather than the original spectrum. The proposed model is rotation-invariant. The vicinity of the direct current [DC] component of the logarithm of the spectrum is modelled by the sum of two exponential functions, while the region of high frequencies is modelled by a single exponential function summed with a constant. We discuss a method for fitting the model to the experimental data, show the results of numerical experiments, and discuss various measures of goodness of the fit. The fitting of the described model was carried out for a sequence of images covering one year, and the time evolution of the measures of goodness of fit is also presented.

6

Rola multimedialnej kartografii i GIS w zarządzaniu strefą brzegową

Bojar K., Szakowski I., Furmańczyk K.

Roczniki Geomatyki

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2005

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T. 3, z. 4

29-33

EN

Multimedia cartography and GIS play very important role in landscape visualization. Using GIS database and visualization software packages assures visual presentation identified as an effective means of communicating landscape-related information. 3D visualization of GIS databases becomes increasingly common in presenting complex urban and rural environments, and mountainous, forested or coastal landscapes. This paper presents the use of multimedia cartography and GIS in coastal landscape visualization. Image draping, photorealistic rendering, virtual worlds and static images viewed in the Internet browser were the main methods used in the process of visualization of geospatial data in mapping and monitoring coastal areas. Although many limitations occurred during the research, basic multimedia presentation of available spatial data showed new possibilities for the management of coastal zone environment within the study area. Coastal zone - an area of intense activity, an area of interchange within and between physical, biological, social, cultural and economic processes . is composed of multiple interacting systems: maritime, terrestrial and riverine. That is why Coastal Zone Management (CZM was established) as a continuous, proactive and adaptive process of resource management for environmentally sustainable development in coastal areas. The implementation of Coastal Zone Management can stimulate and guide the sustainable development of coastal areas and minimize the degradation of the natural system. Multimedia presentations can play an important role in CZM only when they provide appropriate information about the issues of concern with a better understanding of geospatial matters; and also when they allow to perform analyses and to forecast future demand on coastal resources.