Papers by Dariusz Sawicki
Elektronika : konstrukcje, technologie, zastosowania, 2009
Przegląd Elektrotechniczny, 2008
Przegląd Elektrotechniczny, 2006
Archives of Electrical Engineering, 2005
Przegląd Elektrotechniczny, 2005
Przegląd Elektrotechniczny, 2006
Przegląd Elektrotechniczny, 2010
Przegląd Elektrotechniczny, 2010
Lighting Research & Technology, Jun 11, 2015
A comparison of methods for determining unified glare rating was performed. An analysis was made ... more A comparison of methods for determining unified glare rating was performed. An analysis was made based on the results of experiments carried out for a typical office workstation under a controlled lighting environment. The DIALux simulation software and the LMK measuring system were used to calculate the unified glare rating. The main aim of the research was to verify the correctness of these two methods through a subjective glare assessment made by a group of 65 people. A comparison of the unified glare rating values determined by the different objective techniques with the subjective estimation shows that the LMK measurement is the more accurate method.
Przegląd Elektrotechniczny, 2007
Prace Naukowe Politechniki Warszawskiej. Elektryka, 2007
Przegląd Elektrotechniczny, 2010
The analysis of EEG signal is one of the objective methods used in alertness assessment. Many pub... more The analysis of EEG signal is one of the objective methods used in alertness assessment. Many publications confirm the correct assessment of alertness level based on the analysis of selected brain waves. EEG registration is a difficult task; one of the important problems is the necessity to choose which EEG electrode to download the signal for analysis. The authors use different electrodes, often without justifying the choice. Equally often, the only justification is to say that the analyzed signal was the strongest among those available, or the least contaminated with artifacts. The aim of the article is to try to answer the question: signals which electrodes (channels) should be included in the alertness assessment. 33 participants took part in the experiment. Blue and red light was used to stimulate alertness. The impact of such light is documented in many publications. Alertness changes due to specific color of light were evaluated-the changes of alpha and beta bands were analyzed. Statistical analysis has shown that for alertness assessment the following electrodes should be considered: C3 and FC1 for alpha band and F3 and FP1-for beta band signals.
Archives of Electrical Engineering, 2005
Przegląd Elektrotechniczny, 2017
A simple and effective method of recognizing eye blinking in industrial conditions is presented. ... more A simple and effective method of recognizing eye blinking in industrial conditions is presented. The developed method uses a camera built into safety glasses. The presented algorithm can be applied to recognize whether glasses are correctly put on – to check if employees use personal protective equipment. Recognition of open or closed eyes allows control by intentional winking. The algorithm uses only light sources present in the workplace and does not require infrared radiation (IR). The solution was tested on a set of 1797 eye photos recorded in a group of 10 participants. An analysis of the correctness of blink recognition and the correctness of the algorithm's operation in various lighting conditions was carried out. Experiments showed that the proposed algorithm met required project assumptions. The averaged results of blink recognition obtained using the developed method are: accuracy 96.5%, precision 93.8%, specificity 98.9% and sensitivity 84.9%. Additionally the algorit...
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Papers by Dariusz Sawicki