| 研究生: |
廖俊昉 Liao, Chun-fang |
|---|---|
| 論文名稱: |
用於H.264視訊編碼器之轉換域內框模式決策設計 Transform-Domain Block-BasedIntra Mode Decision in H.264/AVC Encoder |
| 指導教授: |
劉濱達
Liu, Bin-da 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: | 2007 |
| 畢業學年度: | 95 |
| 語文別: | 英文 |
| 論文頁數: | 63 |
| 中文關鍵詞: | 轉換域內框模式決策 |
| 外文關鍵詞: | intra mode decision, H.264, intra prediction |
| 相關次數: | 點閱:115 下載:2 |
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本篇論文提出H.264視訊編碼器的內框模式決策,此決策機制利用編碼器之離散餘弦轉換係數以減少需要進行位元率-失真成本計算之模式數目。不同位置的轉換域係數可視為像素以不同型態組合之能量,此決策機制將型態方向類似的係數絕對值總合當作此方向之能量,並選擇能量最強的方向進行位元率-失真成本計算。在四乘四方塊中,決策機制還額外選擇相鄰方向以增加準確性。另外,由於直流模式無方向性,此機制依照轉換域空間之直流係數相對於其它交流係數之能量,判定是否需要做直流模式;H.264標準定義之最可能模式採用上方與左方區塊的預測方向,因此這個模式也列入候選模式。在進行邊長十六像素的巨方塊內框模式決策時,本研究利用H.264取出各個四乘四方塊直流係數的阿答瑪轉換係數進行模式決策。本論文也提出四乘四方塊轉換域內框預測之硬體,此硬體利用整數轉換之線性與預測方塊之對稱性減少傳統計算整數轉換域絕對差值總合的計算量。平均而言,本論文提出之模式決策可選出更少的模式。模擬結果顯示本演算法平均降低峰值信噪比0.015 dB,提高位元率1%。
In this thesis, we propose a novel algorithm for intra mode decision using the coefficients of the current blocks. Then a hardware design for 4×4 intra prediction using the linearity of the H.264 integer transform and the spatial property of predicted block is proposed. By comparing the energy of the coefficients with similar transform-domain tendency, we select the prediction modes whose directions are close to the tendency with maximum weight. Moreover, the Intra_4×4_DC mode is chosen depending on the ratio of the AC energy to DC coefficient. The most probable mode is also chosen as a candidate to exploit the information of the adjacent blocks and to reduce the bit-rate. The number of intra prediction modes is reduced to save the computation of rate-distortion cost. The proposed hardware is designed to compute the minimum distortion of a 4×4 block. Comparing with the other designs, we need fewer modes. The results show that our proposed algorithm reduces the PSNR value by appropriately 0.015 dB in average, while the bit-rate increment is less than 1%.
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