Wyniki wyszukiwania dla: ACOUSTICAL IMAGING

• Underwater Acoustic Imaging of the Sea

  Publikacja

  • G. Grelowska
  • E. Kozaczka

  - Archives of Acoustics - Rok 2014

  Acoustic waves are a carrier of information mainly in environments where the use of other types of waves, for example electromagnetic waves, is limited. The term acoustical imaging is widely used in the ultrasonic engineering to imaging areas in which the acoustic waves propagate. In particular, ultrasound is widely used in the visualization of human organs - ultrasonography (Nowicki, 2010). Expanding the concept, acoustical imaging...

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• An Objective Focussing Measure for Acoustically Obtained Image

  Publikacja

  • K. Czarnecki
  • M. Moszyński
  • M. Rojewski

  - Rok 2012

  In scientific literature many parameters of an image sharpness can be defined, that can be used for the evaluation of display energy concentration (EC). This paper proposes a new, simple approach to EC quantitative evaluation in spectrograms, which are used for the analysis and visualization of sonar signals. The presented approach of the global-image EC measure was developed to the evaluation of EC in arbitrary direction (or at...

• Rough Set Based Modeling and Visualization of the Acoustic Field Around the Human Head

  Publikacja

  • P. Szczuko
  • B. Kostek
  • J. Kotus
  • A. Czyżewski

  - Rok 2015

  The presented research aims at modeling acoustical wave propagation phenomena by applying rough set theory in a novel manner. In a typical listening environment sound intensity is determined by numerous factors: a distance from a sound source, signal levels and frequencies, obstacles’ locations and sizes. Contrarily, a free-field is characterized by direct, unimpeded propagation of the acoustical waves. The proposed approach is...

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