Browsing by Keywords "High frequency"

Now showing items 1-8 of 8

    • Asymptotic wave-like modeling of dielectric lenses 

      Yurchenko, V. B.; Altıntaş, Ayhan (IEEE, 2007)
      We propose asymptotic wave-like approximations for the accurate modeling of dielectric lenses used in quasi-optical systems of millimeter, submillimeter, and infrared wave applications. For the comparison, we obtain an ...

    • An audio watermarking algorithm via zero assigned filter banks 

      Yücel, Z.; Özgüler, A.B. (2005)
      In order to identify the owner and distributor of digital data, a watermarking scheme for audio files is proposed in frequency domain. The scheme satisfies the imperceptibility and persistence requirements and is robust ...

    • Autofocus method in thermal cameras based on image histogram 

      Turgay, E.; Teke, Oğuzhan (IEEE, 2011)
      In this paper, a new histogram based auto-focusing method for thermal cameras is proposed. This proposed method is realized by FPGA (Field Programmable Gate Array) and DSP (Digital Signal Processor) working together and ...

    • Contour based smoke detection in video using wavelets 

      Töreyin, B. Uğur; Dedeoğlu, Yiğithan; Çetin, Ahmet Enis (IEEE, 2006-09)
      This paper proposes a novel method to detect smoke in video. It is assumed the camera monitoring the scene is stationary. The smoke is semi-transparent at the early stages of a fire. Therefore edges present in image frames ...

    • Determining F2 layer parameters via optimization using IRI model and IONOLAB TEC estimations 

      Şahin, O.; Sezen, U.; Arıkan, F.; Arıkan, Orhan (IEEE, 2011)
      We know that F2 layer of the ionosphere is most important layer in the progaration of high frequency (HF) waves. In this study, The relation of the height (HmF2) and the critical frequency (FoF2) of F2 layer-among the ...

    • Methods for probing charging properties of polymeric materials using XPS 

      Sezen, H.; Ertas, G.; Suzer, S. (2010)
      Various thin polystyrene, PS, and poly(methyl methacrylate), PMMA and PS + PMMA blend films have been examined using the technique of recording X-ray photoelectron spectrum while the sample is subjected to ±10 V d.c. bias, ...

    • Volatile organic compound plume detection using wavelet analysis of video 

      Töreyin, B.U.; Çetin, A.E. (2008)
      A video based method to detect volatile organic compounds (VOC) leaking out of process equipments used in petrochemical refineries is developed. Leaking VOC plume from a damaged component causes edges present in image ...

    • Wavelet based real-time smoke detection in video 

      Töreyin, B. Uğur; Dedeoǧlu, Yiğithan; Çetin, Ahmet Enis (IEEE, 2005-09)
      A method for smoke detection in video is proposed. It is assumed the camera monitoring the scene is stationary. Since the smoke is semi-transparent, edges of image frames start loosing their sharpness and this leads to a ...