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      • Department of Electrical and Electronics Engineering
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      Video gözetleme uygulamalarında kamera sabotaj sezimi

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      Author(s)
      Aksay, A.
      Temizel, A.
      Çetin, A. Enis
      Date
      2007-06
      Source Title
      2007 IEEE 15th Signal Processing and Communications Applications, SIU
      Publisher
      IEEE
      Pages
      1 - 4
      Language
      Turkish
      Type
      Conference Paper
      Item Usage Stats
      177
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      115
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      Abstract
      Son yıllarda video gözetim uygulamaları için kullanılan kamera sayılarında kayda değer artış olmuştur. Bu kameraların amaçlandığı gibi çalışıyor olması anlamlı bilgi yakalaması önemlidir. Suç işleyecek kişiler kamera önünü kapatarak, boya püskürterek ya da kamera odağını bozarak görüntülerinin ve eylemlerinin kaydedilmesini engellemek yoluna başvurmaktadır. Kameraları gözleyen birisinin olmaması ya da dikkatinin dağınık olması sabotajın fark edilememesine neden olur ve sistem normal olarak çalışıyor ve kaydediyor olsa bile kayıtların kullanılamaz olmasına yolaçar. Bu bildiride, dalgacık alanında arkaplan çıkarımı yöntemi kullanılarak kamerada görüş azalması ve kamera önünün kapatılması durumlarının gerçek zamanlı kestirimi önerilmektedir. Ayrıca, sistemin gerçek hayat koşullarında daha güvenilir çalışması için bazı yöntemler de önerilmiştir.
       
      In the recent years, number of surveillance cameras deployed has increased significantly. However it is important that these cameras are functioning as intended and capturing meaningful data. Offenders resort to techniques such as blocking the camera view, using a foreign object to cover the lens, spray painting or de-focusing the camera lens to prevent capture of their images and recording of their actions. These cameras are often unattended or security guard might have lost his focus and if discovery of such an attempt is not immediate, even though there is no failure in the system and the images are still being recorded, these recordings are not useful. In this paper, we propose methods for real-time discovery of visibility loss and covered camera lens using background subtraction in wavelet domain. We also propose some methods to increase robustness of the system in real-life scenarios.
      Keywords
      Background subtraction
      Camera view
      Foreign objects
      Surveillance cameras
      Video-surveillance applications
      Visibility loss
      Wavelet domains
      Camera lenses
      Cameras
      Image enhancement
      Lenses
      Optical instruments
      Paint spraying
      Painting
      Signal processing
      Security systems
      Permalink
      http://hdl.handle.net/11693/27050
      Published Version (Please cite this version)
      http://dx.doi.org/10.1109/SIU.2007.4298763
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      • Department of Electrical and Electronics Engineering 3702
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