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      • Department of Electrical and Electronics Engineering
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      Autofocus method in thermal cameras based on image histogram

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      Author
      Turgay, E.
      Teke, Oğuzhan
      Date
      2011
      Source Title
      Proceedings of the 19th Signal Processing and Communications Applications Conference, SIU 2011
      Publisher
      IEEE
      Pages
      462 - 465
      Language
      Turkish
      Type
      Conference Paper
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      Abstract
      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 simultaneously. HF (High Frequency) component, obtained from real-time image flow by FPGA and DSP is used for auto-focusing process. Proposed method is able to determine the focus direction from the HF component produced in the process of histogram equalization by FPGA, unlike Fourier transform and pixel differenve based methods in the literature. With this superiority, proposed method requires no extra calculation for thermal cameras for which histogram equalization is necessary. Analysis show that proposed method is successful on the simulations and scanning thermal cameras.
      Keywords
      Auto-focus
      Auto-focusing
      High frequency
      Histogram equalizations
      Image histograms
      Real-time images
      Thermal camera
      Digital signal processors
      Field programmable gate arrays (FPGA)
      Fourier transforms
      Graphic methods
      Signal processing
      Cameras
      Permalink
      http://hdl.handle.net/11693/28400
      Published Version (Please cite this version)
      https://doi.org/10.1109/SIU.2011.5929687
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      • Department of Electrical and Electronics Engineering 3601
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