4th International ICST Mobile Multimedia Communications Conference

Research Article

Fractional Wavelet Filter for Camera Sensor Node with external Flash and extremely little RAM

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  • @INPROCEEDINGS{10.4108/ICST.MOBIMEDIA2008.4026,
        author={Stephan Rein and Stephan Lehmann and Clemens G\'{y}hmann},
        title={Fractional Wavelet Filter for Camera Sensor Node with external Flash and extremely little RAM},
        proceedings={4th International ICST Mobile Multimedia Communications Conference},
        publisher={ICST},
        proceedings_a={MOBIMEDIA},
        year={2010},
        month={5},
        keywords={Fractional wavelet filter Camera sensor node Flash memory},
        doi={10.4108/ICST.MOBIMEDIA2008.4026}
    }
    
  • Stephan Rein
    Stephan Lehmann
    Clemens Gühmann
    Year: 2010
    Fractional Wavelet Filter for Camera Sensor Node with external Flash and extremely little RAM
    MOBIMEDIA
    ICST
    DOI: 10.4108/ICST.MOBIMEDIA2008.4026
Stephan Rein1,*, Stephan Lehmann1,*, Clemens Gühmann1,*
  • 1: Wavelet Application Group, Department of Energy and Automation Technology, Chair of Electronic Measurement and Diagnostic Technology, Technische Universität Berlin.
*Contact email: stephan.rein@tu-berlin.de, stephan.lehmann@tu-berlin.de, clemens.guehmann@tu-berlin.de

Abstract

This paper introduces the fractional wavelet filter as a technique to compute fractional values of each wavelet subband, thus allowing a low-cost camera sensor node with less than 2 kByte RAM to perform a multi-level 9/7 picture wavelet transform. The picture dimension can be 256x256 using fixed-point arithmetic and 128x128 using floating-point arithmetic. The technique is applied to a typical 16 Bit sensor node architecture with external flash memory, which allows to line-wisely read and write picture data.