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Author: 黃詠健
Yong-Jian Huang
Thesis Title: 基於當代相片美學探勘之準則建立一個具有專業品質的影像增強機制
Developing a Professional Image Enhancement Mechanism Based on Contemporary Photograph Aesthetics Criteria Mining
Advisor: 范欽雄
Chin-Shyurng Fahn
Committee: 李建德
Jiann-Der Lee
Wei-Min Jeng
Tai-Lin Chin
Degree: 碩士
Department: 電資學院 - 資訊工程系
Department of Computer Science and Information Engineering
Thesis Publication Year: 2015
Graduation Academic Year: 103
Language: 英文
Pages: 90
Keywords (in Chinese): 當代美學相片探勘影像增強顯著圖CART決策樹X-平均算法
Keywords (in other languages): contemporary aesthetics, image mining, image enhancement, saliency map, CART decision tree algorithm, X-means algorithm.
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  • 近年來,由於科技的進步,使得手機與相機越來越發達,也使得人們拍照的越來越容易,相片數量因而大量增加。大部分的人拍照只為記錄生活,但如何拍出美感就值得探討。專業攝影師利用他們藝術天分拍下的那一瞬間表達的情感,而且部分的攝影師會用他們專業的美學技術來去增強照片進而更加呈現當時的意境。如何讓電腦學依據模糊的美學定義來分析美學相片與美學修圖來幫助人們是一個有意義且困難的挑戰。

    In recent years, the rise of smartphones and digital cameras makes it easier to take photos and a mass amount of photos are spread on the Internet. Photographic aesthetics is some sort of art which is expressed by the professional photographers’ aesthetic sensibilities and emotion. Moreover, many professional photographers make adjustments to the photos in post, and let photos much become more beautiful and meet the conditions of photographic aesthetics rules. Enhancing the images followed by ambiguous photographic aesthetics become a big task for computer.
    In this thesis, an automatically image enhancement based on the aesthetics images dataset from the internet is proposed. We used many method to analyze an image such as RMS method, Laplace of Gaussian method, saliency map method, Gabor filter method and so on. We can use above sixteen features extracted from image to judge an image is good or not. We present a new concept to enhance images by using cluster styles which are generated from X-means and CART decision tree. When an input image is judged as a bad image by CART decision tree, the reason can be traced back by the decision tree characteristic to know which features needs enhancement. We list ten features which can enhance image efficiently such as gamma correction, Gaussian blur and so on. We use Interval Halving method to approach the value which come from giving suggestion of a feature by CART decision tree based on contemporary aesthetics criteria.
    In the experiments, we apply cluster and classification to our dataset, and the average of cluster’s accuracy is 96.8%. In the enhancement part, we use CART decision tree aesthetic suggestion which means some feature are not enough or some feature are too high that can enhance our image step by step. Then we can get differently image style result like professional photographers do.

    中文摘要 i Abstract ii 致謝 iv Contents v List of Figures vii List of Tables xii Chapter 1 Introduction 1 1.1 Overview 1 1.2 Motivation 2 1.3 System Description 3 1.4 Thesis organization 4 Chapter 2 Background and Related Works 5 2.1 Objective Concept of Photographic Aesthetics 5 2.2 Related Proposals of Photographic Aesthetics and Image Enhancement 6 Chapter 3 Feature Extraction 11 3.1 Color components 11 3.2 Harmony 13 3.3 Blur and Sharpness 14 3.4 Contrast 16 3.5 Simplicity 17 3.5.1 Simplicity definition 17 3.5.2 Saliency map 18 3.5.3 Combine simplicity and saliency map 19 3.6 Colorfulness 20 3.7 Depth of Field 21 3.8 Homogeneous Texture Descriptor 23 3.9 Other Features 25 Chapter 4 Photograph Quality Prediction and Image Enhancement with Contemporary Criteria 28 4.1 X-means Algorithm 28 4.1.1 Basic concept of X-means algorithm 28 4.1.2 Image clustering 31 4.2 CART Algorithm 33 4.2.1 Basic concept of CART decision tree 33 4.2.2 Pruning 34 4.2.3 The training set assignment 35 4.3 Feature Enhancement 37 4.3.1 Gamma correction 38 4.3.2 Gaussian blur 40 4.3.3 Sharpness 42 4.3.4 Contrast 43 4.3.5 Other enhancement features 44 4.4 Approximation method 46 4.5 Image enhancement with contemporary aesthetics criteria 47 Chapter 5 Experimental Results and Discussions 53 5.1 Experimental Setup 53 5.2 Results of Cluster and Decision Tree Classification 56 5.3 The Results of Image Enhancement 63 Chapter 6 Conclusions and Future Works 69 6.1 Conclusions 69 6.2 Future Works 71 References 72

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