近年來,使用人工智慧來進行圖像上色(Image Colorization)的技術已經日漸成熟,以此為基礎的各類應用如雨後春筍般地出現,像是為復古的黑白照片或影片添加色彩(Deoldify),力求重現古早時的生活情景,另一方面,這項技術普遍被運用在數位媒體創作中,例如根據電腦繪圖的線稿,賦予適當的顏色,不僅縮短創作的時程,也使得創作者能夠便捷地創作。然而,目前市面上擁有自動上色功能的軟體,多以真實世界的圖像和插畫線稿為考量,對於傳統漫畫而言,主要還是採用用戶交互上色(User Interaction Colorization),透過繪製對應顏色的線條給予提示,來引導電腦上色,過程中仍需投入不少人力成本,有鑑於此,本研究運用深度學習結合影像處理技術,基於GAN(Generative Adversarial Network)架構,設計二階段的上色模型,並歸納漫畫中的特徵,依此調整訓練參數,在Lab色彩空間中,我們先把黑白漫畫轉換成線稿圖片,將線稿圖片輸入到線稿圖片轉灰階圖片的上色模型,得到灰階圖片,接著將灰階圖片輸入給灰階圖片轉彩色圖片的上色模型,得到上色結果,最後,我們再使用圖像處理技巧優化輸出圖片,同時探討不同方法流程對上色結果造成的影響,尋找最佳解。
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