Wyniki wyszukiwania - BazTech

1

Comparison of Effective Coverage Calculation Methods for Image Quality Assessment Databases

Buczkowski M., Stasiński R.

International Journal of Electronics and Telecommunications

|

2018

|

Vol. 64, No. 3

307--313

EN

This article provides a comparison of a three methods that can be used for calculating effective coverage of image quality assessment database. The aim of this metric is to show how well the database is filled with variety of images. For each image in the database the Spatial Information (SI) and Colorfulness (CF) metric is calculated. The area of convex hull containing all the points on SI x CF plane is indication of total coverage of the database, but it does not show how efficiently this area is utilized. For this purpose an effective coverage was introduced. An analysis is performed for 16 databases - 13 publicaly available and 3 artificial created for the purpose of showing advantages of the effective coverage.

2

Non-invasive measurement of chemical compounds levels in human body

Kossowski T., Kossowska K., Stasiński R.

Measurement Automation Monitoring

|

2017

|

Vol. 63, No. 6

200--202

EN

The paper presents a system for measuring substances in human body by a combined technique: using visible light and near infrared spectroscopy. The approach is non-invasive, attenuation of radiation by tissues is evaluated. Measurement of two chemical compounds levels is described: that of glucose and of ethylic alcohol (ethanol). The presented measuring system is self-calibrating. Due to this, it is possible to measure changes of compound concentrations in different parts of body, e.g. wrist, arms or legs. The main measurement is done in infrared light (up to 1000 nm), auxiliary ones are performed in visible light (narrow band between 600-680 nm and wide spectrum from around 420 nm to 780 nm - white light). This allows for measurement not only a compound level, but also characteristic properties of tissues in place where measurement is done. Results of measurements are provided and advantages of multi-wavelength measurements discussed.

3

Non-invasive blood glucose measurement

Kossowski T., Kossowska K., Stasiński R.

Measurement Automation Monitoring

|

2016

|

Vol. 62, No. 5

175--177

EN

The paper presents a system for measuring blood glucose level based on spectroscopy in the near infrared range. Specific features of this system are limited spectral range of measurements, and the use of visible light detector to identify the density of irradiated tissue and to correct measurement results in the infrared range. Presented are principles of measuring system construction, including measures undertaken to increase its precision and results of tests carried out using the constructed measurement system. The results are close to those obtained from a traditional meter.

4

Zwiększanie rozdzielczości przestrzennej obrazów medycznych

Malczewski K., Stasiński R.

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

|

2013

|

nr 2-3

71--74

PL

Omówiono zastosowanie technik nadrozdzielczości w celu zwiększenia rozdzielczości przestrzennej obrazów, pochodzących z urządzeń diagnostyki medycznej. Podstawowym założeniem wszystkich prezentowanych rozwiązań jest brak jakichkolwiek zmian wprowadzanych w architekturze sprzętowej urządzeń. Zaproponowano dwa algorytmy umożliwiające poprawę jakości obrazów MRI i PET/CT.

EN

In the paper application of super-resolution techniques for increasing spatial resolution of medical images is addressed. It is assumed that the proposed methods do not imply any changes in the architecture of applied equipment. Two algorithms are proposed aimed at improving image quality of MRI and PET/CT.

5

Novel Ideas for Lossless Audio Coding

Ulacha G., Stasiński R.

International Journal of Electronics and Telecommunications

|

2013

|

Vol. 59, No. 1

17-23

EN

Novel ideas for lossless audio coding analyzed in the paper are linked with forward predictor adaptation, and concern optimization of predictors on the basis of zero-order entropy and MMAE criterions, and context sound coding. Direct use of the former criterion is linked with exponential growth of optimization procedure, hence, a suboptimal algorithm having polynomial complexity is proposed. It is shown that on average the new types of predictors are better than those obtained by MMSE technique, while two- and three context systems are on average better than a single predictor one. It also appears that 7-bit PARCOR coefficients in the MPEG-4 ALS standard have insufficient precision for some predictor length, and that for very long frames coding results improve with the predictor rank practically in unlimited way.