隨著深度學習的逐漸成熟，在圖像生成方面的相關技術如：遷移式學習(Domain transfer learning)、生成對抗式網路(Generative adversarial network)與監督式學習(Supervised learning)，應用於圖像處理(Image processing)、藝術風格轉換(Style transfer)、自動化上色(Automatic colorization)等研究相當熱絡。然而，當前的研究對於圖像生成後產生的瑕疵問題少有深入探討，舉例來說：在自動化上色的研究，其目標為對灰階圖像進行彩色化的工作。然而，就目前的研究結果來觀察會發現大多數的上色品質並不理想，通常會觀察到三種顯著的缺陷：顏色溢出、顏色褪色和顏色不一致。特別是就顏色溢出的問題而言，在藝術風格轉換的研究領域也同樣面臨了這項瑕疵的不良影響。有鑑於此，本研究提出了一個適用於上色瑕疵檢測的深度學習模型，歸納顏色溢出的發生規則，設計顏色溢出的圖像生成演算法，並建立深度學習的訓練資料集及測試資料集。模型架構藉由深度卷積對待檢測圖片進行特徵萃取後，透過反卷積來預測顏色溢出的發生位置。以期能藉由顏色溢出的瑕疵預測，反向回饋上色模型以進行成果優化，提升上色品質。

With the development of deep learning technology, there are already various works applying domain transfer learning, generative adversarial network and supervised learning to image processing, style transfer and automatic colorization. However, only few research has been conducted on the defects caused by deep image generation methods. For example, the objective of automatic colorization is to colorize the grayscale image, but most of the results are not good enough as we expected. There are usually three significant defects: color bleeding, color vanishing and color inconsistency. Among these three problems, the color bleeding is the most frequent issue. Motivated by this observation, we propose in this thesis a deep learning model for color bleeding detection. We organize the conditions for the occurrence of color bleeding to design color bleeding generation algorithms and produce the datasets for both training and testing. We use convolutional layers to extract features from the input image and deconvolutional layers to predict where color bleeding occurs. With this information, we may optimize the automatic colorization by the predicted loss from our color bleeding detection model.

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