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Empirical Evaluation of Boundary Policies for Wavelet-based Image Coding
Schremmer, Claudia
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URL:
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http://download.springer.com/static/pdf/330/chp%25...
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Dokumenttyp:
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Konferenzveröffentlichung
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Erscheinungsjahr:
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2001
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Buchtitel:
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Wavelet analysis and its applications : Second International Conference, WAA 2001, Hong Kong, China, December 18 - 20, 2001, proceedings
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Titel einer Zeitschrift oder einer Reihe:
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Lecture Notes in Computer Science
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Band/Volume:
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2251
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Seitenbereich:
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4-15
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Herausgeber:
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Tang, Yuan Yan
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Ort der Veröffentlichung:
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Berlin [u.a.]
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Verlag:
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Springer
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ISBN:
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3-540-43034-2
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ISSN:
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0302-9743 , 1611-3349
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Sprache der Veröffentlichung:
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Englisch
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Einrichtung:
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Fakultät für Wirtschaftsinformatik und Wirtschaftsmathematik > Praktische Informatik IV (Effelsberg 1989-2017)
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Fachgebiet:
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004 Informatik
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Abstract:
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The wavelet transform has become the most interesting new algorithm for still image compression. Yet there are many parameters within a wavelet analysis and synthesis which govern the quality of a decoded image. In this paper, we discuss different image boundary policies and their implications for the decoded image. A pool of gray-scale images has been wavelet-transformed at different settings of the wavelet filter bank and quantization threshold and with three possible boundary policies. Our empirical evaluation is based on three benchmarks: a first judgment regards the perceived quality of the decoded image. The compression rate is a second crucial factor. Finally, the best parameter settings with regard to these two factors is weighted with the cost of implementation. Contrary to the JPEG2000 standard, where mirror padding is implemented, our investigation proposes circular convolution as the boundary treatment.
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