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題 名 | Fractal Image Coding Using Projection-Based Classification and Variable Shape Matching=應用投影技巧與可變形狀匹配之碎形影像編碼 |
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作 者 | 趙和昌; 邱炳樟; | 書刊名 | 中國工程學刊 |
卷 期 | 21:5 1998.09[民87.09] |
頁 次 | 頁507-520 |
分類號 | 312.9 |
關鍵詞 | 碎形影像編碼; 可變形狀區塊的碎形編碼; 電腦斷層掃描影像重建; 投影分類演算法; Fractal image coding; Variable shape block fractal coding; Computerized tomographic image reconstruction; Projection classification algorithm; |
語 文 | 英文(English) |
中文摘要 | 在本論文中提出一個可愛形狀區塊的碎形影像編碼系統。此方法大體而言分成兩 階段來完成:一是分類階段、另一個是調適形狀區塊階段。在分類階段中,一個測試影像區 塊依照它的方向屬性被歸類成它自己的類別,其中區塊的方向是應用投影與反投影技術來估 測,也就是非常流行的電腦斷層掃描影像重建技巧。基於計算複雜的理由,只考慮四個方向 來定義投影分類演算法。針對幾個測試影像的實驗結果,顯示這個計畫的分類方式勝過於梯 度分類演算法。在調適形狀區塊階段中,把投影分類演算法和分離與合併演算法組合成可變 形狀區塊變換。對於值域區塊與定義域區塊,我們定義出十五種合併模型形式與十種形狀構 成要素,並將其使用於搜尋演算法中。在這個可變形狀區塊的碎形編碼研討,一個較好的解 碼影像品質與傳送位元率之間的取捨被完成。對於數個測試影像的實驗中,可變形狀區塊的 碎形編碼系統顯然是一個有效的編碼系統。 |
英文摘要 | In this paper, a fractal image compression system based on adaptive variable shape block transform is proposed. The procedure can be divided into approximately two basic phases: the classification phase and the adaptive shape block phase. In the classification phase, a testing image block is assigned to its own class according to its direction attribute. The direction of the block is estimated by employing the technique of projection/backprojection which is a tomographic image reconstruction skill. Due to computational complexity, only four projection directions are resolved to construct the projection classification algorithm (PCA). Computer simulations show that the proposed classification method outperforms the gradient classification algorithm. In the adaptive shape block phase, PCA and the algorithm of split/ merge are incorporated to form the variable shape block transformation. For the range blocks and domain blocks, we define fifteen merging patterns and ten shape components in the searching algorithm. Under this fractal coding approach, a better trade-off between the decoded image quality and transmitting bit rate is performed. Several examples are presented to show the effectiveness of this coding system. |
本系統中英文摘要資訊取自各篇刊載內容。