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頁籤選單縮合
題名 | 離散小波轉換影像壓縮法之改善=Improvement of Image Compression Using DWT |
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作 者 | 魏永強; 潘恆堯; | 書刊名 | 遠東學報 |
卷期 | 25:2 2008.06[民97.06] |
頁次 | 頁361-366 |
分類號 | 312.1 |
關鍵詞 | 影像壓縮; 離散小波轉換; 算數編碼; Image compression; Discrete wavelet transform; Arithmetic coding; |
語文 | 中文(Chinese) |
中文摘要 | 本論文提出一個針對離散小波轉換影像壓縮法的改良方法。由於離散小波轉換之後,其樹狀資料結構之間具有相當的相關性,妥善運用這些相關性,我們可以改變使用算數編碼時的機率模式,來提高影像壓縮的效果。透過機率模式的改變,再利用樹狀資料結構父子節點之間的關聯性,來處理離散小波轉換之後影像資訊的冗餘性。去除這些多餘的冗餘性,自然可以提升壓縮效果。 |
英文摘要 | This paper proposes a modification for performance improvement of image compression using discrete wavelet transform (DWT). We notice that there are significant correlations between the parent-child nodes of tree data structure. Properly exploiting these correlations, we could modify the probability model of arithmetic coding for improving compression efficiency. With the modification of the probability model and the correlations of the parent-child tree structure, we could remove the information redundancy resulting from discrete wavelet transform. Evidently, the compression efficiency could be improved by eliminating the data redundancy. |
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