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研究生:黃冠諭
研究生(外文):Huang, Kuan-Yu
論文名稱:基於深層孿生網路之成對式學習影像視覺品質評估
論文名稱(外文):Pairwise Learning on Image Quality Assessment using Deep Siamese Neural Networks
指導教授:林嘉文林嘉文引用關係
指導教授(外文):Lin, Chia-Wen
口試委員:彭文孝賴尚宏劉宗榮
口試委員(外文):Peng, Wen-HsiaoLai, Shang-HongLiu, Tsung-Jung
口試日期:2017-10-23
學位類別:碩士
校院名稱:國立清華大學
系所名稱:電機工程學系所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2017
畢業學年度:106
語文別:英文
論文頁數:43
中文關鍵詞:主觀評測孿生網路成對式學習影像縮放
外文關鍵詞:Subjective Quality AssessmentSiamese NetworkPairwise LearningImage Retargeting
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在影像處理研究領域中,評估影像品質之優劣一直都是相當具重要的環節,
一個設計良好的影像品質評估方法,將提供影像演算法設計者們共同評比其算法
性能的準則,以將提高評估結果作為目標,來分析方法間的差異與優劣,並能進
而協助他們提出對應的改善策略。
影像評估方法會依照評估問題的類型去特別設計,像是經典的影像超解析品
質評估上,就會使用峰值信躁比(PSNR)來測量該算法產生出的高解析度影像
與原使影像之間的差異,將此失真落差用分數來呈現,然而多數的評估做法都是
基於簡單且具象的數理計算,因此在較為複雜且抽象的美感評估問題時,評估結
果往往難以吻合實際的人類視覺系統,近年來許多人將深度學習運用於主觀品質
評估領域,藉由大量人為標記的評估資料,使類神經網路模型學習出難以直接定
義的抽象評估函數,而這類作法也確實達到較傳統品質評測方法優異的成果,然
而對於某些無法直接定義標注資料的問題(如:影像縮放重定義(Image
Retargeting)),會因為資料搜集上的障礙而導致無法直接地去學習。
在本篇論文中,我們將提出一套成對式學習(Pairwise learning)的影像主觀
品質評測,基於孿生神經網路(Siamese network)之學習架構,讓我們的方法可
以使卷積神經網路模型(CNN)訓練在簡單的成對註記資料上,這不僅能幫助我
們解決影像縮放重定義之主觀評估問題,還可以延伸至其他相似問題上,並且對
於一般主流的主觀評估資料庫上,也能作為舒緩訓練資料蒐集之難度。我們的實
驗顯示在影像縮放重定義主觀評估上,本篇作法可以達到較過往作法優異的性能
表現,且擁有更良好的延伸拓展性;而在一般的主觀評估資料庫上,也接近了其
他過往作法的性能表現。
Image quality assessment is a very important component in image processing. A
good image quality assessment method provides designers a criterion for comparing
performance. Every designer directs toward the target of increasing the score produced
by this method. In addition, this quality assessment criteria can facilitate designers to
propose a suitable strategy for improving their methods.
Image quality assessment methods are designed specially according to task goals.
However, lots of methods are simple and human adjusted, they are hard to solve
complicated quality assessing problems which are closer to the human visual system.
Recently, many subjective quality assessment methods based on deep neural network
have been proposed, which need large amounts of labeling data, and these methods has
gotten significant improvement. Nevertheless, there have some cases difficult to label
the subjective quality score directly (like: Image Retargeting), which cannot be learned
by existing method due to the obstacle of collecting training data.
In this thesis, we propose a pairwise training model for image subjective quality
assessment. Our architecture is based on Siamese network, which can make our model
training on paired-comparison data. This architecture lets us solve the problem on
image retargeting and easily extends to similar tasks. On general subjective quality
assessment database, our method can also alleviate the difficulty of data collections.
Experiment shows that our proposed method produces better results compared to
previous works on the retargeted image case and comparative results in the general
quality assessment database, even under the limitation of labeling information.
摘 要 .......i
Abstract.......ii
Content.......... iii
Chapter 1 Introduction ......4
Chapter 2 Related Work...........8
2.1 RIQA........8
2.2 CNN-based GIQA..........10
Chapter 3 Proposed Method................13
3.1 Overview......................13
3.2 Initialization ..........................15
3.3 Network Architecture............20
3.4 Optimization ..........................22
Chapter 4 Experiments and Discussions.........24
4.1 Benchmark Databases.............24
4.2 Performance Evaluations........27
4.3 Predicted Quality Score Maps ....34
4.4 Limitations.......................34
Chapter 5 Conclusion...............37
References.........................38
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