混合式半色調技術在HEVC畫面內預測之應用

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蔡佾倫(Yi-Lun Tsai) 查詢紙本館藏

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通訊工程學系

論文名稱

混合式半色調技術在HEVC畫面內預測之應用
(A Hybrid Halftoning Technique for HEVC Intra Prediction)

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摘要(中)

新一代的視訊壓縮標準HEVC(High Efficiency Video Coding)畫面內預測之角度模式提升至33個不同的方向，使得畫面內預測能更精確，而得到更好的壓縮效率。有序抖色法和錯誤擴散法都是半色調技術的一種，我們將之加入HEVC畫面內預測可以改善有複雜紋理之區塊的預測畫面，錯誤擴散法能提升較多的編碼效能，卻必須花費較多的編碼時間，有序抖色法雖然改善的效果沒錯誤擴散法好。本篇論文將有序抖色法與錯誤擴散法結合在一起，這兩種方法與周圍像素點有很高的相依性，因此能夠同時將雙邊參考像素資訊延續至預測畫面中。實驗結果呈現，混合式半色調的編碼效能比有序抖色法好而且只略增加一點編碼時間，時間的花費也比錯誤擴散法少。除此之外，雙向預測也被加入到HEVC畫面內預測中，雙向預測可以將兩種角度模式合成去得到預測畫面，使得編碼效能能再提升。

摘要(英)

High Efficiency Video Coding (HEVC) is the latest standard for video compression based on the H.264/AVC. It has an increased 35 different modes in intra prediction, in order get better coding performance. Order dithering and error diffusion are original technique of Halftoning, which can improve the prediction of image with complex texture to intra prediction. The coding performance of error diffusion is better than order dithering, on the other hand, it need more time comsumption. In this paper, we combine order dithering and error diffusion, by using its highly correlated pixels with the neighboring pixels. This can improve the quality of image prediction by extending the information of bilateral reference pixels. The results show that the coding performance of hybrid error diffusion and order dithering is better than order dithering with a little increase in time consumption. In addition, bi-prediction is proposed based on synthesizing of two neighboring predictors. The predicted block is generated by combining the two predictors so we can further enhance the coding performance.

關鍵字(中)

★ HEVC
★ 畫面內預測
★ 半色調
★ 錯誤擴散法
★ 有序抖色法
★ 雙向預測

關鍵字(英)

★ HEVC
★ Intra Prediction
★ Halftoning
★ Error Diffusion
★ Ordered Dithering
★ Bi-directional prediction

論文目次

章節目錄
第一章緒論 1
1.1 高效率視訊編碼(HEVC)簡介 1
1.2 研究動機與目的 5
1.3 論文架構 5
第二章畫面內預測介紹與文獻回顧 6
2.1 HEVC畫面內預測模式探討 6
2.2利用渲染方法改善HEVC畫面內預測論文回顧 16
2.3利用有序抖色法改善HEVC畫面內預測論文回顧 17
第三章利用混合型半色調改善HEVC畫面內預測編碼 30
3.1 有序抖色法之可適性遮罩 31
3.2 錯誤擴散法與有序抖色法之合併 40
3.3 混合型預測模式探討 50
3.4 綜合編碼效能比較 54
第四章利用紋理合成法改善HEVC畫面內預測編碼效能 67
4.1 紋理合成法簡介 67
4.2 混合型半色調與紋理合成法之結合型演算法 69
4.3綜合編碼效能分析 74
第五章結論與未來展望 90
參考文獻 92

參考文獻

參考文獻
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指導教授

林銀議(Yin-Yi Lin)

審核日期

2016-7-22

推文