Wyniki wyszukiwania - BazTech

1

Research on information content of light field on the image plane illuminated by incoherent light source

Cai Xiao-ou, Lai Xian-jing, Wang Hui

Optica Applicata

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2019

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Vol. 49, nr 2

265--273

EN

A novel approach for the measurement of information content of light field on the image plane illuminated by an incoherent light source has been proposed according to Shannon’s information theory. We put forward a hypothetical concept named "coherent wavelet source" on an incoherent light source which can form an independent coherent signal on the object surface based on the expression of mutual intensity on the object surface. As a result, the number of independent coherent signals on the object surface can be made out by dividing the whole illumination source on a coherent wavelet source size. Meanwhile, the maximum number of degree of freedom of light field which can reach the image plane is given based on the structure of imaging system. Concrete algorithm for the information content of the imaging light illuminated by a 1D linear light source and a 2D circular light source are presented.

2

Assistive computer technologies for people with disabilities

Davydov M., Lozynska O., Kunanets N., Pasichnyk V.

ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes

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2018

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Vol. 7, No 2

39--44

EN

The paper examines modern ways to improve the efficiency of information perception using multimedia technology, thus ensuring the use of a powerful new tool for understanding of information by persons with various forms of nosology. The use of assistive computer technologies for people with disabilities is investigated. The peculiarities of formation of multimedia information content for users with special needs were analyzed. The digital library as a set of information technology services is proposed making multimedia information content accessible to users with various forms of nosology. It was investigated that in spite of rapid development of modern communication means and assistive technologies their use is limited for people with disabilities, in particular for hearing impaired people. Most of available technologies for hearing impaired people translate speech into text. As was shown this approach is not fairly efficient because Sign language turned out to be the most convenient way of communication for the respondents.

3

A new approach to diagnostic symptom assessment based on information content measures

Gałka T.

Diagnostyka

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2016

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Vol. 17, No. 3

103--108

EN

A complex diagnostic object typically generates a large number of diagnostic symptoms. For proper lifetime consumption monitoring it is necessary to select those which best represent technical condition deterioration. Such selection may be based on the Singular Value Decomposition method. The paper presents a novel alternative approach, which employs an information content measure. As the end of object life is approached, symptoms are to an increasing extent dominated by deterministic lifetime consumption processes and therefore become more predictable. Thus symptoms with the highest information content decrease rate should be considered most useful. For a proper assessment, however, symptom sensitivity to condition parameters should also be addressed. A new measure referred to as representativeness factor is proposed. Suitability of such approach is demonstrated for the fluid-flow system of a large steam turbine.

PL

Złożone obiekty diagnozowania zwykle są źródłem wielu symptomów diagnostycznych. Dla właściwego monitorowania wyczerpywania żywotności należy wybrać te z nich, które najlepiej odwzorowują degradację stanu technicznego. Wybór ten można oprzeć na metodzie rozkładu względem wartości szczególnej. W pracy przedstawiono nowatorskie alternatywne podejście, w którym wykorzystuje się miarę zawartości informacji. Wraz ze zbliżaniem się do końca życia obiektu symptomy są w coraz większym stopniu określone przez deterministyczne procesy ubytku żywotności, a zatem stają się coraz bardziej przewidywalne. Za najbardziej użyteczne należy zatem uznać symptomy z najszybszym spadkiem zawartości informacji. We właściwej ocenie należy jednak uwzględnić także wrażliwość symptomu na parametry stanu. Zaproponowano nową miarę określoną jako współczynnik reprezentatywności. Przydatność takiego podejścia została zademonstrowana na przykładzie układu przepływowego turbiny parowej.

4

Zawartość informacyjna wyników kontrolowanych pomiarów głębokości

Kołaczyński S.

Zeszyty Naukowe Akademii Marynarki Wojennej

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2013

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R. 54 nr 2 (193)

49--56

PL

W artykule przedstawiono próbę oceny zawartości informacyjnej wyników wyrównania danych pomiarowych na przecinających się halsach, na których pozycje okrętu zostały wyznaczone z dużą dokładnością. Na bazie wybranej metody wyrównania oraz definicji ilości informacji oceniono zawartość informacyjną wyrównywanego wyniku.

EN

This article contains the first attempt of the information content estimation of the crossing observations errors adjustment. On the base of adjustment methods and definitions of the information theory, estimation of the information content of the adjusted result is given.

5

Detecting and matching interest points in relative scale

Islam M. S., Sluzek A., Zhu L.

Machine Graphics and Vision

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2005

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Vol. 14, No. 3

259-283

EN

The same object seen in two different images can be geometrically and photometrically transformed. In this paper, a method of interest point detection and matching is described for the same object in different images. One of the main considerations is the change in the object scale. In this method, a reference scale is assigned to a particular instance of the object, and the change of scale is represented by a relative scale. Then, Harris' relative scale method is used for interest point detection. This method is robust to linear geometric transformations. A heuristic method for threshold selection is also described for robustness to intensity changes in a cluttered environment with partial occlusions. The repeatability rate of interest points for this method is higher then that for the existing methods. For the matching process, a local invariant descriptor is computed in the relative scale for each of the detected interest points. A hashing technique is applied to find the matches efficiently. The matching method enables finding a good number of correct matches for different types of transformations in a cluttered environment and one with partial occlusions. The proposed single scale detection and matching method could be effectively used for many practical applications, where the relative scale of the object can be predicted in advance.

6

Computable approximations of reals: an information-theoretic analysis

Calude C.S., Hertling P.H.

Fundamenta Informaticae

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1998

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Vol. 33, nr 2

105-120

EN

How fast can one approximate a real by a computable sequence of rationales? Rather surprisingly, we show that the answer to this question depends very much on the information content in the finite prefixes of the binary expansion of the real. Computable reals, whose binary expansions have a very low information content, can be approximated ( very fast) with a computable convergence rate. Random reals, whose binary expansions contain very much information in their prefixes, can be approximated only very slowly by computable sequences of rationales (this is the case, for example, for Chaitin's W numbers)if they can be computably approximated at all. We also show that one can computably approximate any computable real very slowly, with a convergence rate slower than any computable function. However, there is still a large gap between computable reals and random reals: any computable sequence of rationals which converges (monotonically) to a random real converges slower than computable sequence of rationals which converges (monotonically) to a computable real.