Wyniki wyszukiwania - BazTech

1

Modifications of Range-Doppler Algorithm for Compensation of SAR Platform Motion Instabilities

Gorovyi I. M., Bezvesilniy O. O., Vavriv D. M.

International Journal of Electronics and Telecommunications

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2014

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Vol. 60, No. 3

225-231

EN

Two modifications of the range-Doppler algorithm (RDA) have been proposed to solve problems of SAR platform motion instabilities. First, the multi-look processing based on the RDA with an extended Doppler bandwidth has been introduced for correction of radiometric errors. Second, the RDA has been modified to perform SAR image formation on short-time acquisition intervals to use it in a recently-developed local-quadratic map-drift autofocus (LQMDA) method. The performance of the methods is illustrated with experimental data obtained by airborne SAR systems.

2

Parametric logarithmic type image processing for contrast based auto-focus in extreme lighting conditions

Florea C., Florea L.

International Journal of Applied Mathematics and Computer Science

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2013

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Vol. 23, no. 3

637--648

EN

While most of state-of-the-art image processing techniques were built under the so-called classical linear image processing, an alternative that presents superior behavior for specific applications comes in the form of Logarithmic Type Image Processing (LTIP). This refers to mathematical models constructed for the representation and processing of gray tones images. In this paper we describe a general mathematical framework that allows extensions of these models by various means while preserving their mathematical properties. We propose a parametric extension of LTIP models and discuss its similarities with the human visual system. The usability of the proposed extension model is verified for an application of contrast based auto-focus in extreme lighting conditions. The closing property of the named models facilitates superior behavior when compared with state-of-the-art methods.

3

Algorytmy ustawiania ostrości kamer w systemie stereowizyjnym robota mobilnego

Sankowski D., Jeżewski S., Duch P., Stolarski Z., Błaszczyk S.

Automatyka / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

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2010

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T. 14, z. 3/1

353-358

PL

W niniejszej publikacji zostały przedstawione algorytm DCT i algorytm Tenenbauma w zastosowaniu do ogniskowania obrazu w układzie ruchomej kamery umieszczonej na przegubie robota. Możliwość kontrolowania położenia pozycji soczewki jest niezbędna w stereowizyjnych procedurach przetwarzania obrazu. Autorzy przedstawiają analizę czasu działania przedstawionych algorytmów.

EN

Algorithms DCT and Tenenbaum are presented in this paper. Those algorithms were used to find focus in image from cameras mounted on the mobile robot head. Lens position is very important to find depth map using stereovision cameras. Authors discus time of focus calculation by those algorithms.

4

Liquid lens; an advancement in optical communications

Casey P.

Journal of Automation Mobile Robotics and Intelligent Systems

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2007

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Vol. 1, No. 2

67-70

EN

"Liquid lens" technologies promise significant advancements in machine vision and optical Communications systems. Utilizing two isodensity liquids with differing electrical characteristics to focus, liquid lenses require no moving parts for operation. Liquid lenses also offer Iower power consumption and smaller package sizes than their electromechonical counterparts. Liquid lenses are quickly becoming a viable alternative to conventional lens technologies for a wide variety of applications. Notable variations of liquid lens technology are discussed. A machine vision student project utilizing this technology will be discussed in detail. An adaptotion of the machine vision project for use in human vision correction, and independent research in optical Communications are also used to exemplify the versatile nature of this technology.