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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

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

This paper tackles the automatic colorization task of a sketch image given an already-colored reference image. Colorizing a sketch image is in high demand in comics, animation, and other content creation applications, but it suffers from…

Computer Vision and Pattern Recognition · Computer Science 2020-05-12 Junsoo Lee , Eungyeup Kim , Yunsung Lee , Dongjun Kim , Jaehyuk Chang , Jaegul Choo

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

Sketches reflect the drawing style of individual artists; therefore, it is important to consider their unique styles when extracting sketches from color images for various applications. Unfortunately, most existing sketch extraction methods…

Computer Vision and Pattern Recognition · Computer Science 2024-07-22 Chang Wook Seo , Amirsaman Ashtari , Junyong Noh

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

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

We propose a novel reference-based video colorization framework with spatiotemporal correspondence. Reference-based methods colorize grayscale frames referencing a user input color frame. Existing methods suffer from the color leakage…

Computer Vision and Pattern Recognition · Computer Science 2020-11-26 Naofumi Akimoto , Akio Hayakawa , Andrew Shin , Takuya Narihira

The benefits of medical imaging are enormous. Medical images provide considerable amounts of anatomical information and this facilitates medical practitioners in performing effective disease diagnosis and deciding upon the best course of…

Computer Vision and Pattern Recognition · Computer Science 2022-10-18 Sudarshan Devkota , Summanta Pattanaik

Recent remarkable improvements in large-scale text-to-image generative models have shown promising results in generating high-fidelity images. To further enhance editability and enable fine-grained generation, we introduce a…

Computer Vision and Pattern Recognition · Computer Science 2023-04-20 Kangyeol Kim , Sunghyun Park , Junsoo Lee , Jaegul Choo

Most colorization models condition only on a single reference, typically the first frame of the scene. However, this approach ignores other sources of conditional data, such as character sheets, background images, or arbitrary colorized…

Computer Vision and Pattern Recognition · Computer Science 2026-04-21 Bryan Constantine Sadihin , Yihao Meng , Michael Hua Wang , Matteo Jiahao Chen , Hang Su

Exemplar-based image colorization aims to colorize a grayscale image using a reference color image, ensuring that reference colors are applied to corresponding input regions based on their semantic similarity. To achieve accurate semantic…

Computer Vision and Pattern Recognition · Computer Science 2025-05-28 Satoshi Kosugi

Existing learning-based image inpainting methods are still in challenge when facing complex semantic environments and diverse hole patterns. The prior information learned from the large scale training data is still insufficient for these…

Computer Vision and Pattern Recognition · Computer Science 2022-08-01 Taorong Liu , Liang Liao , Zheng Wang , Shin'ichi Satoh

One tough problem of image inpainting is to restore complex structures in the corrupted regions. It motivates interactive image inpainting which leverages additional hints, e.g., sketches, to assist the inpainting process. Sketch is simple…

Computer Vision and Pattern Recognition · Computer Science 2024-05-21 Chang Liu , Shunxin Xu , Jialun Peng , Kaidong Zhang , Dong Liu

In this paper, we present a fast exemplar-based image colorization approach using color embeddings named Color2Embed. Generally, due to the difficulty of obtaining input and ground truth image pairs, it is hard to train a exemplar-based…

Computer Vision and Pattern Recognition · Computer Science 2021-08-25 Hengyuan Zhao , Wenhao Wu , Yihao Liu , Dongliang He

Exemplar-based image colorization aims to colorize a target grayscale image based on a color reference image, and the key is to establish accurate pixel-level semantic correspondence between these two images. Previous methods search for…

Computer Vision and Pattern Recognition · Computer Science 2023-11-30 Siqi Chen , Xueming Li , Xianlin Zhang , Mingdao Wang , Yu Zhang , Yue Zhang

Exemplar-based colourisation aims to add plausible colours to a grayscale image using the guidance of a colour reference image. Most of the existing methods tackle the task as a style transfer problem, using a convolutional neural network…

Image and Video Processing · Electrical Eng. & Systems 2021-05-06 Marc Gorriz Blanch , Issa Khalifeh , Alan Smeaton , Noel O'Connor , Marta Mrak

With the recent advancement in deep learning, we have witnessed a great progress in single image super-resolution. However, due to the significant information loss of the image downscaling process, it has become extremely challenging to…

Computer Vision and Pattern Recognition · Computer Science 2018-04-11 Zhifei Zhang , Zhaowen Wang , Zhe Lin , Hairong Qi

We propose the first deep learning approach for exemplar-based local colorization. Given a reference color image, our convolutional neural network directly maps a grayscale image to an output colorized image. Rather than using hand-crafted…

Computer Vision and Pattern Recognition · Computer Science 2018-07-24 Mingming He , Dongdong Chen , Jing Liao , Pedro V. Sander , Lu Yuan

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
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