頁籤選單縮合
題名 | Use of Wavelets in Fractal Compression Algorithm for Enhanced Performance=在碎形編碼演算法中運用小波以增強編碼表現 |
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作者 | Sankaragomathi, B.; Ganesan, L.; Arumugam, S.; | 書刊名 | International Journal of Information Systems for Logistics and Management |
卷期 | 6:1 2010.12[民99.12] |
頁次 | 頁73-80+91 |
分類號 | 312.1 |
關鍵詞 | 碎形影像壓縮; 小波影像壓縮; 疊代函數系統; 離散小波轉換之影像壓縮法; Fractal image compression; Wavelet image compression; IFS; Iterated function systems; SPIHT; Set partitioning in hierarchical trees; |
語文 | 英文(English) |
英文摘要 | ABSTRACT Fractal coding suffered from low coding efficiency, difficulties to obtain high quality encoding of images, and blocking artifacts at low bit rates and exhaustive inherent coding time. Blocking artifacts can be avoided if fractal coding is performed in the wavelet domain. A new fast and efficient image coder is developed that applies the speed of the wavelet transform to the image quality of the fractal compression. Fast fractal encoding using Fisher’s domain classification is applied to the low pass subband of wavelet transformed image and a modified Set Partitioning In Hierarchical Trees (SPIHT) coding on the remaining coefficients. Furthermore, image details and wavelet progressive transmission characteristics are maintained, no blocking effects from fractal techniques are introduced, and the encoding fidelity problem common in fractal-wavelet hybrid coders is solved. This scheme promotes heavy reduction in encoding-decoding time compared with the pure accelerated Fractal coding results. This method is compared with SPIHT wavelet coding. In both cases, the new scheme improves the subjective quality of pictures for high-medium-low bit rates. |
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