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Ivanov O.N.,Research Institute of Applied Acoustics
Pattern Recognition and Image Analysis | Year: 2014

A general method of adaptation of pixel-by-pixel background subtraction models designed for a fixed camera is developed in the case of a PTZ camera mounted on a mobile platform. The method involves the use of two identical pixellevel background models. The first one is directly applied to the classification of the current scene, while the second one is used to prepare the first model for the transformation to the new coordinate system, the one closer to the current position of the PTZ video camera. The chosen solution makes it possible to eliminate a large number of false positives, which inevitably occur after each transformation of the background model. The experimental verification of the developed method using two well-known background models GMM and ViBe demonstrated good quality of the scene classification and low computational load. © 2014 Pleiades Publishing, Ltd.

Kostenko K.V.,Research Institute of Applied Acoustics | Kryukov Y.S.,Research Institute of Applied Acoustics
Acoustical Physics | Year: 2016

A technique for detecting direct signal pulses based on steep rising edges of acoustic pressure is developed. The technique consists in calculating the mirror derivative of the received signal and normalizing it in a specific manner. This makes it possible to amplify weak direct signals and suppress strong reflected ones. A key feature of this technique is that it ensures a high probability of detection of direct signal pulses while keeping the number of false detections at a minimum. © 2016, Pleiades Publishing, Ltd.

Bagratashvili V.N.,Russian Academy of Sciences | Vakshtein M.S.,Research Institute of Applied Acoustics | Zavorotnyi Y.S.,Moscow State University | Krotova L.I.,Russian Academy of Sciences | And 5 more authors.
Inorganic Materials: Applied Research | Year: 2010

A method of diffusion introduction of CdSe quantum dots (QDs) into polymer microparticles in supercritical carbon dioxide was proposed, implemented, and studied. Photoluminescence (PL) spectra of fine nanocomposite powders based on polymethyl methacrylate/polystyrene and CdSe QDs were measured and analyzed. Produced samples are characterized by a pronounced PL band with a general maximum at 620 nm. It was found that QD introduction into polymer microparticles by impregnation in a supercritical carbon dioxide medium efficiently stabilizes them in space and significantly increases photochemical stability of their luminescence characteristics. © Pleiades Publishing, Ltd., 2010.

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