使用多重線性回歸技術針對RGB全彩影像之有效彩度抽樣和亮度修正

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研究生：	鄭仁舜 Jen-Shun Cheng
論文名稱：	使用多重線性回歸技術針對RGB全彩影像之有效彩度抽樣和亮度修正 Effective Chroma Subsampling and Luma Modidication for RGB Full-color Images Using the Multiple Linear Regression Technique
指導教授：	鍾國亮 Kuo-Liang Chung
口試委員:	貝蘇章 Soo-Chang Pei 廖弘源 Hong-Yuan Liao 范國清 Kuo-Chin Fan 花凱龍 Kai-Lung Hua
學位類別：	碩士 Master
系所名稱：	電資學院 - 資訊工程系 Department of Computer Science and Information Engineering
論文出版年：	2020
畢業學年度：	108
語文別：	英文
論文頁數：	39
中文關鍵詞：	彩度抽樣、失真模型、亮度修正、多元線性回歸、品質位元率權衡、RGB全彩影像、通用視頻編碼
外文關鍵詞：	Chroma subsampling, Distortion model, Luma modification, Multiple linear regression, Quality-bitrate tradeoff, RGB full-color image, Versatile video coding (VVC)
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上一筆

與傳統 RGB 全彩影像轉成 YUV 的彩度抽樣方法不同，本文提出了一種新穎有效的彩度抽樣和亮度修正（CSLM）方法。對於每個 2×2 YUV區塊，首先，提出了一個新的重建 2×2 RGB 全彩色塊失真模型，然後為了使重建的 2×2 RGB 全彩色塊可以最大程度地減少色塊失真，我們提出了一種多元線性回歸方法來解我們的 CSLM 方法，從而顯著改善重構的 RGB 全採影像的品質。綜合實驗結果顯示，我們的方法在通用視頻編碼（VVC）針對重建RGB全彩影像，相對於六種傳統方法和三種最新方法比較，具有更好的品質和品質位元率權衡優勢。

Differing from the traditional chroma subsampling on the YUV image converted from a RGB full-color image, in this thesis, we propose a novel and effective chroma subsampling and luma modification (CSLM) method. For each 2x2 YUV block, first, a newly reconstructed 2x2 RGB full-color block-distortion model is proposed, and then we propose a multiple linear regression approach to tackle our CSLM method such that the reconstructed 2x2 RGB full-color block-distortion can be minimized, achieving significant quality improvement of the reconstructed RGB full-color image. Based on the Kodak and IMAX datasets, the comprehensive experimental results demonstrated that on the versatile video coding (VVC) platform VTM-8.0, our method achieves substantial quality and quality-bitrate tradeoff improvement of the reconstructed RGB full-color images relative to six traditional methods and the three state-of-the-art methods.

Recommendation Letter . . . . .  . . . . . . . . . . . . . . . . . . . i
Approval Letter . . . . . . .  . . . . . . . . . . . . . . . . . . . . ii
Abstract in Chinese . . . . . . . . . . . . . . . . . . . . . . . . . .iii
Abstract in English . . . . . . . . . . . . . . . . . . . . . . . . . .iv
Acknowledgements in Chinese . . . . . . . . . . . . . . . . . . . . . .v
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi
List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . .viii
List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 RelatedWork . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
1.2 Contributions . . . . . . . . . . . . . . . . . . . . . . . . . . .5
2 The Reconstructed Block-Distortion Model and The Derived Overdetermined System . . . . . . . . . . . . .  . 7
2.1 Estimating the Reconstructed 2×2 RGB Full-color Blockdistortion Model. . . . . . . . . . . . . . . . .  . 7
2.2 Deriving the Overdetermined System . . . . . . . . . . . . . . .  10
3 Determining The Subsampled Chroma Pair and Modified Luma Values . . 15
3.1 Solving the Overdetermined System by Matrix Pseudoinverse Technique . .15
3.2 The Whole Procedure to Realize Our CSLM Method . . . . . . . . . . 17
4 Experimental Results . . . . . . . . . . . . . . . . . . . . . . . . 19
4.1 CPSNR,SSIM,and FSIMc Merits . . . . . . .  . . . . . . . . . . . . 19
4.2 Quality-bitrate Merit, Luma Mean Preservation Effect, and Execution Time Comparison . . . . . . . . . . . . . . . . 21
5 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Letter of Authority . . . . . . . . . . . . . . . . . . . . . . . . . . 29

                                

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全文公開日期 2025/06/29 (校內網路)
全文公開日期本全文未授權公開 (校外網路)
全文公開日期本全文未授權公開 (國家圖書館：臺灣博碩士論文系統)

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