Spherical coding algorithm for wavelet image compression
Yükleniyor...
Tarih
2009-05
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
IEEE-Inst Electrical Electronics Engineers Inc
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
In recent literature, there exist many high-performance wavelet coders that use different spatially adaptive coding techniques in order to exploit the spatial energy compaction property of the wavelet transform. Two crucial issues in adaptive methods are the level of flexibility and the coding efficiency achieved while modeling different image regions and allocating bitrate within the wavelet subbands. In this paper, we introduce the "spherical coder," which provides a new adaptive framework for handling these issues in a simple and effective manner. The coder uses local energy as a direct measure to differentiate between parts of the wavelet subband and to decide how to allocate the available bitrate. As local energy becomes available at finer resolutions, i.e., in smaller size windows, the coder automatically updates its decisions about how to spend the bitrate. We use a hierarchical set of variables to specify and code the local energy up to the highest resolution, i.e., the energy of individual wavelet coefficients. The overall scheme is nonredundant, meaning that the subband information is conveyed using this equivalent set of variables without the need for any side parameters. Despite its simplicity, the algorithm produces PSNR results that are competitive with the state-of-art coders in literature.
Açıklama
This work was supported in part by the National Science Foundation under Grant DMS9872890 and in part by the Isik University BAP-05B302 Grant.
Anahtar Kelimeler
Coding, Image, Wavelet, Adaptive coding, Bit rate, Compaction, Energy measurement, Energy resolution, Image coding, PSNR, Wavelet coefficients, Wavelet domain, Wavelet transforms, Coder, Spherical coding algorithm, Wavelet image compression, Wavelet subband, Codecs, Image compression, Adaptive frameworks, Adaptive methods, Bit rates, Coding algorithms, Coding efficiencies, Direct measures, Highest resolutions, Image regions, Local energies, Spatial energies, Spatially adaptive, Sub bands, Wavelet coders
Kaynak
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
18
Sayı
5
Künye
Ateş, H. F. & Orchard, M. T. (2009). Spherical coding algorithm for wavelet image compression. IEEE Transactions on Image Processing, 18(5), 1015-1024. doi:10.1109/TIP.2009.2014502
