基於卷積神經網路方法下，針對掌骨及C線蟲影像進行年齡估測

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研究生：	郭韋良 Kuo, Wei-Liang
論文名稱：	基於卷積神經網路方法下，針對掌骨及C線蟲影像進行年齡估測 Bone Age Assessment and C. elegans Age Prediction Using Deep Convolutional Neural Network
指導教授：	鐘太郎 Jong, Tai-Lang
口試委員:	黃裕煒 Huang, Yu-Wei 謝奇文 Hsieh, Chi-Wen
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：	2018
畢業學年度：	106
語文別：	中文
論文頁數：	112
中文關鍵詞：	機器學習、人工智慧、骨齡檢測、秀麗隱桿線蟲、卷積神經網路、InceptionResNetV2
外文關鍵詞：	Machine learning, Artificial intelligence, bone age assessment, deep convolutional neural network, Caenorhabditis elegans, InceptionResNetV2
相關次數：	點閱：1 下載：0
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本論文前半部分主要在介紹機器學習的原理，多種基於梯度下降法下的優化演算法及深度學習神經網路多種不同的架構。後半部分在介紹本論文所做的實驗。
本論文主要以人工智慧的方式針對兩種類影像資料--掌骨影像與C線蟲顯微影像作處理。首先專注於在掌骨影像骨齡檢測上使用深度學習方式取代以往醫生人力判讀或是傳統影像處理特徵抽取技術。基於多種卷積神經網路模型下，針對原始掌骨影像及前處理去除雜訊後的影像做比較，在此所用的訓練資料為美國人掌骨影像資料庫，最後再加入額外的特徵考量，討論其預測結果並綜合比較各種架構下的準確率。本論文最後在訓練資料使用原始掌骨影像與前處理後掌骨影像混合之資料集，套用InceptionResNetV2的架構，獲得最低的測試資料Mean absolute error 5.71個月。最後使用美國人掌骨影像所訓練出來的深度學習模型，套用在台北榮總1到18歲孩童的掌骨X光影像集上做測試，得到了與以往醫生看法相近的結論，發現經訓練資料為美國人的模型判讀台灣人掌骨影像的骨齡值普遍都偏大，有一個正的偏差值，並針對為何發生此結果加以討論並修正模型。
本論文實驗的第二部分專注於秀麗隱桿線蟲(C線蟲)的日齡判讀。針對陽明大學許翱麟教授所提供的C線蟲顯微影像，透過深度學習的方式取代以往生物學者肉眼透過生理特徵做日齡判讀。後續在輸入項新增額外特徵，並透過InceptionResNetV2模型下，於測試資料的判斷誤差mean absolute error僅0.94天。使用影像分類的方式將結果分為14類，使用InceptionResNetV2模型，分類正確率在測試資料上達到了56%的正確率。以上的方式將能夠使得生物學者在使用C線蟲研究衰老時能有更精準的依據。

The first part of this thesis mainly introduces the principles of machine learning, a variety of optimization algorithms based on gradient descent, and different architectures of deep learning neural networks. The second part introduces the experiments on two sets of image databases conducted in this thesis.
The most important purpose in this thesis is handling two kinds of different image data sets by artificial intelligence. The first experiment focuses on the bone age assessment using deep learning methods to replace the traditional ways like interpretation by doctors or feature extraction technology in the past. Based on various convolutional neural network models, the prediction results of using original metacarpal images and images after pre-processing for noise removal are compared. Additional feature inputs are added to discuss the prediction results and comprehensively compare the accuracy under various architectures. Finally, I merge the original images and the pre-processed images to be the training data, and apply the architecture of InceptionResNetV2 to build a model for bone age assessment. It is found that the lowest test data mean absolute error of 5.71 months is achieved.
At the end of the first experiment, the deep learning model trained by the American metacarpal images was used to test the metacarpal X-ray image set of children aged 1 to 18 in Taiwan. It is found that the model trained from American training data predict a larger bone age value for the Taiwanese metacarpal image than its actual bone age. The offsetted results were consistent with doctors' previous knowledge. Discussion of why this result occurs is given and an offset can be added to the models to improve the MAE.
The second experiment in this thesis focuses on the age prediction of Caenorhabditis elegans. The microscopic C. elegans images are provided by Prof. Ao-Lin Hsu, Yangming University. To solve the age prediction problems of the C. elegans, deep learning method is used to replace age prediction made by biologists based on C. elegans’physiological characteristics. By augmenting other features to the input, and using the InceptionResNetV2 model, the mean absolute error in age prediction of the test data is only 0.94 days. Compared with human age prediction, it has successfully improved the accuracy and shortened the processing time, allowing biologists to have a more accurate basis when using C. elegans to study aging characteristics.

摘要    I
ABSTRACT    II
目錄    IV
圖目錄    VIII
表目錄    XII
第一章 緒論    1
1 前言    1
2 研究背景    1
2.1 骨齡預測研究背景    1
2.2 線蟲日齡預測研究背景    1
3 研究動機    2
3.1 骨齡預測研究動機    2
3.2 線蟲日齡預測研究動機    2
4 文獻回顧    3
4.1 骨齡判讀文獻回顧    3
4.2 線蟲日齡判讀文獻回顧    4
5 論文貢獻    5
5.1 骨齡判讀論文貢獻    5
5.2 線蟲日齡判讀論文貢獻    5
6 數據介紹    5
6.1 手掌骨X光片影像資料    5
6.2 C線蟲顯微影像資料    7
7 論文架構    7
第二章 原理    8
1 前言    8
2 REGRESSION迴歸分析    9
2.1 挑選函數    10
2.2 函數的好壞    10
2.3 挑選最好的函數    10
2.4 Non Linear Regression    12
3 梯度下降法(GRADIENT DESCENT)    13
3.1 Gradient descent(GD)    13
3.2 學習率(Learning rate)    16
3.3 Adagrad    17
3.4 RMSporp    19
3.5 Momentum    20
3.6 Adam (Adaptive Moment Estimation) [13]    21
3.7 Full Batch Gradient Descent    22
3.8 Stochastic Gradient Descent    22
3.9 Mini-Batch Gradient Descent    23
3.10 總結    24
第三章 深度學習    25
1 前言    25
2 NEURAL NETWORK    26
2.1 神經網路 (Neural Network)    26
2.2 Activation function    27
2.3 Fully Connected Neural Network    30
3 反向傳播法(BACKPROPAGATION) [21]    33
3.1 Chain Rule    33
3.2 Forward Pass    34
3.3 Backward Pass    35
3.4 總結    37
4 過擬合(OVERFITTING)    38
4.1 權重衰減(Weight decay)    39
4.2 Dropout [22]    40
4.3 Earlystopping    41
5 卷積神經網路(CONVOLUTIONAL NEURAL NETWORK , CNN) [14]    41
5.1 卷積層(Convolutional Layer)    42
5.2 池化層Pooling Layer    44
5.3 Backprapogation in CNN    46
5.4 CNN Visualization    48
5.5 VGG(Visual Geometry Group) [27]    49
5.6 GoogLeNet [28]    50
5.7 ResNet [29]    51
6 FULL CONVOLUTIONAL NEURAL NETWORK [30]    52
6.1 原理及架構    52
6.1 步驟及結果    53
6.2 U-net [32]    54
第四章 分析方法與實驗結果    56
1 前言    56
2 掌骨影像前處理    57
2.1 介紹    57
2.2 整體流程圖    58
2.3 步驟    59
2.4 結果與討論    64
3 骨齡預測實驗方法及流程    65
3.1 資料前處理    65
3.2 資料增強    66
3.3 實驗步驟    68
4 骨齡預測實驗結果及討論    77
5 線蟲日齡估測實驗方法及流程    94
5.1 資料前處理    94
5.2 資料增強    95
5.3 實驗步驟    97
6 線蟲日齡估測實驗結果及討論    102
第五章 結論與未來展望    107
參考文獻    109


                                

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