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Browsing by Subject "JPEG"

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  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Optimization of frequency filtering in random access JPEG library
    (Wydawnictwa AGH, 2008) Radziszewski, Michał; Alda, Witold
    In the paper we present a method of direct access to single blocks of JPEG files which contain textures, with on-the-fly decompression. Anisotropic, adaptive filtering is applied in order to minimize visual defects appearing mainly on blocks borders. Main purpose of the method is to enable fast extraction of only these parts of an entire image which arę currently needed and not to keep whole decompressed texture in the main memory. This approach enables effective usage of high quality textures with Iow memory consumption. It's benefits are mainly demonstrated in rendering complex 3D scenes using nondeterministic ray-tracing algorithm. The algorithms have been encapsulated into DLL and static library.
  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Stratna kompresja obrazu z wykorzystaniem aproksymacji liniowej
    (Wydawnictwa AGH, 2006) Raniszewski, Marcin
    In this paper lossy image compression algorithm has been presented. The algorithm uses linear approximation. The article discusses the compression result of example bitmaps. The conclusions of the usefulness of the algorithm for some kind of pictures has been discussed.