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1
Content available Research on information content of light field on the image plane illuminated by incoherent light source
100%
Cai X.-o. , Lai X.-j. , Wang H.
Optica Applicata
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2019
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tom 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
Content available Assistive computer technologies for people with disabilities
100%
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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tom 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
Content available Zawartość informacyjna wyników kontrolowanych pomiarów głębokości
86%
Kołaczyński S.
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tom 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.
4
Content available remote Detecting and matching interest points in relative scale
86%
Islam M. S. , Sluzek A. , Zhu L.
Machine Graphics and Vision
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2005
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tom 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.
5
Content available remote Effect of electrode contact area on the information content of the recorded electrogastrograms: An analysis based on Rényi entropy and Teager-Kaiser Energy
86%
Alagumariappan P. , Krishnamurthy K. , Kandiah S. , Ponnuswamy M. J.
Polish Journal of Medical Physics and Engineering
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2017
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tom Vol. 23, Iss. 2
37--42
EN
Electrogastrograms (EGG) are electrical signals originating from the digestive system, which are closely correlated with its mechanical activity. Electrogastrography is an efficient non-invasive method for examining the physiological and pathological states of the human digestive system. There are several factors such as fat conductivity, abdominal thickness, change in electrode surface area etc, which affects the quality of the recorded EGG signals. In this work, the effect of variations in the contact area of surface electrodes on the information content of the measured electrogastrograms is analyzed using Rényi entropy and Teager-Kaiser Energy (TKE). Two different circular cutaneous electrodes with approximate contact areas of 201.14 mm2 and 283.64 mm2, have been adopted and EGG signals were acquired using the standard three electrode protocol. Further, the information content of the measured EGG signals were analyzed using the computed values of entropy and energy. Results demonstrate that the information content of the measured EGG signals increases by 6.72% for an increase in the contact area of the surface electrode by 29.09%. Further, it was observed that the average energy increases with increase in the contact surface area. This work appears to be of high clinical significance since the accurate measurement of EGG signals without loss in its information content, is highly useful for the design of diagnostic assistance tools for automated diagnosis and mass screening of digestive disorders.
6
Content available A new approach to diagnostic symptom assessment based on information content measures
86%
Gałka T.
Diagnostyka
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2016
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tom 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.
7
Content available The number of cell types, information content, and the evolution of complex multicellularity
72%
Niklas K. J. , Cobb E. D. , Dunker A. K.
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nr 4
EN
The number of different cell types (NCT) characterizing an organism is often used to quantify organismic complexity. This method results in the tautology that more complex organisms have a larger number of different kinds of cells, and that organisms with more different kinds of cells are more complex. This circular reasoning can be avoided (and simultaneously tested) when NCT is plotted against different measures of organismic information content (e.g., genome or proteome size). This approach is illustrated by plotting the NCT of representative diatoms, green and brown algae, land plants, invertebrates, and vertebrates against data for genome size (number of base-pairs), proteome size (number of amino acids), and proteome functional versatility (number of intrinsically disordered protein domains or residues). Statistical analyses of these data indicate that increases in NCT fail to keep pace with increases in genome size, but exceed a one-to-one scaling relationship with increasing proteome size and with increasing numbers of intrinsically disordered protein residues. We interpret these trends to indicate that comparatively small increases in proteome (and not genome size) are associated with disproportionate increases in NCT, and that proteins with intrinsically disordered domains enhance cell type diversity and thus contribute to the evolution of complex multicellularity.
8
Jakosc przekazu informacji
58%
Gorska E.
Problemy Jakości
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2000
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tom 32
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nr 06
16-18
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