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| 研究生： |
張富貴 Chang, Fu-Kuei |
|---|---|
| 論文名稱： |
減低監控專用視訊壓縮系統之方塊效應 Reduction Block Artifacts On Video Surveillance Systems |
| 指導教授： |
楊家輝
Yang, Jar-Ferr |
| 學位類別： |
碩士 Master |
| 系所名稱： |
電機資訊學院 - 電機工程學系 Department of Electrical Engineering |
| 論文出版年： | 2002 |
| 畢業學年度： | 90 |
| 語文別： | 中文 |
| 論文頁數： | 54 |
| 中文關鍵詞： | 方塊效應 、後處理 |
| 外文關鍵詞： | blocking artifact, postprocess |
| 相關次數： | 點閱：87 下載：1 |
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基於DCT轉換的影像壓縮和量化過程，在低速率的視訊應用中，重建影像常會產生方塊效應。為了計算量和壓縮效率的考量，本實驗室已提出改良式的動態JPEG作為監控專用視訊壓縮系統之架構。然而，在低速率的影像傳輸中，重建影像會產生方塊效應。在本論文中，我們設計一個新的後處理方法，這個方法是利用人類視覺系統(HVS)的特性來去除影像的方塊效應。在本方法中，我們首先藉著(HVS)分類方塊效應的強度和採用適應性的濾波器來有效的減少方塊效應。由實驗結果得知本方法可以有效的去除方塊效應。
Image compression based on discrete cosine transform (DCT) and quantization, generally produces blocky artifacts in the output image for low bit rate video applicaiton. In this thesis, we mainly design a new postprocessing method, which is taken into account properties of the human visual system (HVS) for video surveillance system. For computational complexity and compressing efficiency, in our research lab, we suggest an enhanced motion JPEG coding system. However, the reconstructed images suffer from blocking effect, especially transmitting images in low bit rate. In the proposed method, we first classify the blocking strength by HVS and reduce the blocking effect efficiently by using adaptive filtering.
參 考 文 獻
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[2] ISO/IEC JTC1/SC29/WG11, “ISO/IEC CD 13818： information technology,” MPEG-2 Committee Draft, Dec. 1993.
[3] International Telecommunication Union, “Video coding for low bitrate communication,” ITU-T Recommendation H.263, July. 1995.
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校內：立即公開校外：2002-07-18公開