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It is a time-consuming and tedious work for manually colorizing anime line drawing images, which is an essential stage in cartoon animation creation pipeline. Reference-based line drawing colorization is a challenging task that relies on…

Computer Vision and Pattern Recognition · Computer Science 2023-03-21 Yu Cao , Xiangqiao Meng , P. Y. Mok , Xueting Liu , Tong-Yee Lee , Ping Li

We propose Uni-Animator, a novel Diffusion Transformer (DiT)-based framework for unified image and video sketch colorization. Existing sketch colorization methods struggle to unify image and video tasks, suffering from imprecise color…

Computer Vision and Pattern Recognition · Computer Science 2026-03-04 Xinyuan Chen , Yao Xu , Shaowen Wang , Pengjie Song , Bowen Deng

Sketch colorization plays an important role in animation and digital illustration production tasks. However, existing methods still meet problems in that text-guided methods fail to provide accurate color and style reference, hint-guided…

Computer Vision and Pattern Recognition · Computer Science 2025-02-28 Dingkun Yan , Xinrui Wang , Zhuoru Li , Suguru Saito , Yusuke Iwasawa , Yutaka Matsuo , Jiaxian Guo

Recent advances in diffusion models have significantly improved the performance of reference-guided line art colorization. However, existing methods still struggle with region-level color consistency, especially when the reference and…

Computer Vision and Pattern Recognition · Computer Science 2025-08-14 Qianru Qiu , Jiafeng Mao , Kento Masui , Xueting Wang

We propose the first video diffusion framework for reference-based lineart video colorization. Unlike previous works that rely solely on image generative models to colorize lineart frame by frame, our approach leverages a large-scale…

Computer Vision and Pattern Recognition · Computer Science 2024-09-20 Zhitong Huang , Mohan Zhang , Jing Liao

The production of high-quality 2D animation is highly labor-intensive process, as animators are currently required to draw and color a large number of frames by hand. We present SketchColour, the first sketch-to-colour pipeline for 2D…

Computer Vision and Pattern Recognition · Computer Science 2025-07-03 Bryan Constantine Sadihin , Michael Hua Wang , Shei Pern Chua , Hang Su

Character Animation aims to generating character videos from still images through driving signals. Currently, diffusion models have become the mainstream in visual generation research, owing to their robust generative capabilities. However,…

Computer Vision and Pattern Recognition · Computer Science 2024-06-14 Li Hu , Xin Gao , Peng Zhang , Ke Sun , Bang Zhang , Liefeng Bo

Reference-based sketch colorization methods have garnered significant attention due to their potential applications in the animation production industry. However, most existing methods are trained with image triplets of sketch, reference,…

Computer Vision and Pattern Recognition · Computer Science 2025-04-10 Dingkun Yan , Xinrui Wang , Yusuke Iwasawa , Yutaka Matsuo , Suguru Saito , Jiaxian Guo

Diffusion models have recently demonstrated their effectiveness in generating extremely high-quality images and are now utilized in a wide range of applications, including automatic sketch colorization. Although many methods have been…

Computer Vision and Pattern Recognition · Computer Science 2024-07-04 Dingkun Yan , Liang Yuan , Erwin Wu , Yuma Nishioka , Issei Fujishiro , Suguru Saito

Creating high-quality anime illustrations presents notable challenges, particularly for beginners, due to the intricate styles and fine details inherent in anime art. We present an interactive drawing guidance system specifically designed…

Graphics · Computer Science 2025-07-15 Chuang Chen , Xiaoxuan Xie , Yongming Zhang , Tianyu Zhang , Haoran Xie

Automatic colorization of line drawings has been widely studied to reduce the labor cost of hand-drawn anime production. Deep learning approaches, including image/video generation and feature-based correspondence, have improved accuracy but…

Computer Vision and Pattern Recognition · Computer Science 2025-10-02 Kazuma Nagata , Naoshi Kaneko

Automatic colorization of anime line drawing has attracted much attention in recent years since it can substantially benefit the animation industry. User-hint based methods are the mainstream approach for line drawing colorization, while…

Computer Vision and Pattern Recognition · Computer Science 2023-02-27 Yu Cao , Hao Tian , P. Y. Mok

Sketch colorization is a critical task for automating and assisting in the creation of animations and digital illustrations. Previous research identified the primary difficulty as the distribution shift between semantically aligned training…

Computer Vision and Pattern Recognition · Computer Science 2026-03-10 Dingkun Yan , Xinrui Wang , Ru Wang , Zhuoru Li , Jinze Yu , Yusuke Iwasawa , Yutaka Matsuo , Jiaxian Guo

Many existing video inpainting algorithms utilize optical flows to construct the corresponding maps and then propagate pixels from adjacent frames to missing areas by mapping. Despite the effectiveness of the propagation mechanism, they…

Computer Vision and Pattern Recognition · Computer Science 2025-05-20 Xian Wu , Chang Liu

Automatic black-and-white image sequence colorization while preserving character and object identity (ID) is a complex task with significant market demand, such as in cartoon or comic series colorization. Despite advancements in visual…

Computer Vision and Pattern Recognition · Computer Science 2025-05-06 Junhao Zhuang , Xuan Ju , Zhaoyang Zhang , Yong Liu , Shiyi Zhang , Chun Yuan , Ying Shan

Video object removal and inpainting are critical tasks in the fields of computer vision and multimedia processing, aimed at restoring missing or corrupted regions in video sequences. Traditional methods predominantly rely on flow-based…

Computer Vision and Pattern Recognition · Computer Science 2025-08-19 Jie Liu , Zheng Hui

Coloring line art images based on the colors of reference images is an important stage in animation production, which is time-consuming and tedious. In this paper, we propose a deep architecture to automatically color line art videos with…

Computer Vision and Pattern Recognition · Computer Science 2020-03-31 Min Shi , Jia-Qi Zhang , Shu-Yu Chen , Lin Gao , Yu-Kun Lai , Fang-Lue Zhang

Recent data-driven image colorization methods have enabled automatic or reference-based colorization, while still suffering from unsatisfactory and inaccurate object-level color control. To address these issues, we propose a new method…

Computer Vision and Pattern Recognition · Computer Science 2023-08-04 Jianxin Lin , Peng Xiao , Yijun Wang , Rongju Zhang , Xiangxiang Zeng

Toon shading is a type of non-photorealistic rendering task of animation. Its primary purpose is to render objects with a flat and stylized appearance. As diffusion models have ascended to the forefront of image synthesis methodologies,…

Computer Vision and Pattern Recognition · Computer Science 2024-01-30 Zhongjie Duan , Chengyu Wang , Cen Chen , Weining Qian , Jun Huang

We propose InstanceAnimator, a novel Diffusion Transformer framework for multi-instance sketch video colorization. Existing methods suffer from three core limitations: inflexible user control due to heavy reliance on single reference…

Computer Vision and Pattern Recognition · Computer Science 2026-03-27 Yinhan Zhang , Yue Ma , Bingyuan Wang , Kunyu Feng , Yeying Jin , Qifeng Chen , Anyi Rao , Zeyu Wang
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