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題 名 | Image Compression Using Sub-Band DCT Features for Self-organizing Map=利用分頻轉換編碼與自組織映射之影像壓縮 |
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作 者 | 劉仁俊; 吳如萍; | 書刊名 | 資訊科學應用期刊 |
卷 期 | 3:2 2007.12[民96.12] |
頁 次 | 頁169-177 |
分類號 | 312.1 |
關鍵詞 | 自組織特徵映射; 向量量化; 離散餘弦轉換; 影像壓縮; 類神經網路; SOM; VQ; DCT; Image compression; Neural networks; |
語 文 | 英文(English) |
中文摘要 | 本研究提出利用影像轉換編碼之離散餘弦轉換分頻處理,搭配Kohonen自組織特徵映射的方法,來進行靜態影像的資料壓縮。使用影像轉換編碼的目的為擷取出輸入影像在頻域中的特徵;而分頻的過程是將此轉換結果的直流與交流係數區隔開來。直流之係數可直接傳輸或儲存;交流之係數可利用低通濾波器來完成初步的壓縮,並用來做神經網路之訓練樣本,如此可大幅減輕訓練之負擔,並提高信號雜訊比。向量量化被用在需求高壓縮比的環境中,自組織特徵映射可用來產生向量量化所需要的編碼簿,此方法的優點在於能夠產生順序之編碼簿以保留其位置排列之特性,並能顯著地降低編碼簿的空間維度使壓縮能夠更有效率。高壓縮比以及優異的重整品質是本研究的最終目的,產出之結果無論在通訊、資料壓縮、多媒體和網路等應用方面都會有重要貢獻。 |
英文摘要 | Image compression is an essential task for image storage and transmission. This paper presents a compression scheme for digital still images using Kohonen’s Self-Organizing Map (SOM) algorithm with sub-band Discrete Cosine Transform (DCT) features as input. The method of DCT is chosen to be the preprocessing scheme in order to identify the image frequency information. The sub-band scheme is then utilized to separate the DC and AC coefficients in order to reduce the learning complexity of Kohonen networks. When high compression rates are needed, vector quantization (VQ) is often applied. SOM is used in this paper to generate codebook for VQ. It has the advantages of preserving the topological property that generate ordered codebook with substantial dimension reduction. The consequence makes image compression even more effective. Simulation results show that with our scheme high compression ratio is obtained while good reconstruction quality is also maintained. |
本系統中英文摘要資訊取自各篇刊載內容。