Počet záznamů: 1

A Cyclostationarity Analysis Applied to Scaled Images

  1. 1.
    0339845 - UTIA-B 2010 RIV DE eng C - Konferenční příspěvek (zahraniční konf.)
    Saic, Stanislav - Mahdian, Babak
    A Cyclostationarity Analysis Applied to Scaled Images.
    Neural Information Processing. Berlin: Springer, 2009 - (Leung, C.; Lee, M.; Chan, J.), s. 683-690. Lecture Notes in Computer Science, 5864. ISBN 978-3-642-10682-8.
    [ICONIP 2009. International Conference on Neural Information Processing /16./. Bangkok (TH), 01.12.2009-05.12.2009]
    Grant CEP: GA ČR GA102/08/0470
    Výzkumný záměr: CEZ:AV0Z10750506
    Klíčová slova: Interpolation * scaling * cyclostationary * authentication * image forensics
    Kód oboru RIV: IN - Informatika
    http://library.utia.cas.cz/separaty/2010/ZOI/babak-a cyclostationarity analysis applied to scaled images.pdf http://library.utia.cas.cz/separaty/2010/ZOI/babak-a cyclostationarity analysis applied to scaled images.pdf

    The knowledge of image’s geometric history plays an important role in image signal compression, image registration, image retrieval and especially in image forensics. In this paper we focus on scaling and show that images that have undergone scaling contain hidden cyclostationary features. This makes possible employing the well–developed theory and efficient methods of cyclostationarity for a blind analyzing of the history of images in respect to scaling transformation. To verify this, we also propose a cyclostationarity detection method applied to our problem and show how the traces of scaling can be detected and the specific parameters of the transformation estimated. The method is based on the fact that a cyclostationary signal has a frequency spectrum correlated with a shifted version of itself. A quantitative measure of the efficiency of the method is proposed as well.
    Trvalý link: http://hdl.handle.net/11104/0183248