| 研究生: |
張雅惠 Ya-Hui Chang |
|---|---|
| 論文名稱: |
應用遺傳演算法於向量量化之新編碼簿設計法 A New Coding Scheme of Vector Quantization by Using Genetic Algorithm |
| 指導教授: |
侯永昌
Young-Chang Hou |
| 口試委員: | |
| 學位類別: |
碩士 Master |
| 系所名稱: |
管理學院 - 資訊管理學系 Department of Information Management |
| 畢業學年度: | 89 |
| 語文別: | 中文 |
| 論文頁數: | 57 |
| 中文關鍵詞: | 向量量化 、遺傳演算法 、影像壓縮 |
| 相關次數: | 點閱:7 下載:0 |
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本研究擬以遺傳演算法為基礎,設計一套完整的編碼簿設計演算法。我們會先將灰階影像分割成大小為dxd的影像區塊後,並對這些影像區塊求其區塊像素平均值,並將大於區塊平均值之像素,編碼為1;反之,則編碼為0。之後,我們從這些簡化之影像區塊中,運用遺傳演算法找出K個有代表性之簡化影像區塊,以做為碼向量。而為了在遺傳演算的演化期間,維持編碼簿的大小為K,故我們在遺傳演算法之初始化、交配及突變階段,都分別設計了一些機制,以保證不會產生不合理的染色體。在還原影像區塊時,將該影像區塊的高部平均值及低部平均值分別代入編碼向量中1與0的部份,即可得到接近原圖的還原影像。
本研究有下列的優點:編碼簿較傳統作法之編碼簿有通用性。一般而言,編碼簿之大小為256,而我們的編碼簿設計法,就算編碼簿的大小遠小於256,也能保持不錯的影像還原品質。而在運算簡化上,由於我們的影像區塊及碼向量之形態較為簡單,故我們在建立編碼簿與搜尋碼向量的速度都會較傳統向量量化法快速。而由於保存了原有影像區塊的部份資訊,故可避免影像區塊邊緣過於清晰的問題。
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