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Existing research based on deep learning has extensively explored the problem of daytime image dehazing. However, few studies have considered the characteristics of nighttime hazy scenes. There are two distinctions between nighttime and…

Computer Vision and Pattern Recognition · Computer Science 2024-03-28 Xiaofeng Cong , Jie Gui , Jing Zhang , Junming Hou , Hao Shen

Estimating the reflectance layer from a single image is a challenging task. It becomes more challenging when the input image contains shadows or specular highlights, which often render an inaccurate estimate of the reflectance layer.…

Computer Vision and Pattern Recognition · Computer Science 2023-08-08 Yeying Jin , Ruoteng Li , Wenhan Yang , Robby T. Tan

Supervised learning models often make systematic errors on rare subsets of the data. When these subsets correspond to explicit labels in the data (e.g., gender, race) such poor performance can be identified straightforwardly. This paper…

Machine Learning · Computer Science 2021-10-19 Greg d'Eon , Jason d'Eon , James R. Wright , Kevin Leyton-Brown

Image composition targets at inserting a foreground object into a background image. Most previous image composition methods focus on adjusting the foreground to make it compatible with background while ignoring the shadow effect of…

Computer Vision and Pattern Recognition · Computer Science 2022-05-12 Yan Hong , Li Niu , Jianfu Zhang , Liqing Zhang

The automated management of invasive weeds is critical for sustainable agriculture, yet the performance of deep learning models in real-world fields is often compromised by two factors: challenging environmental conditions and the high cost…

Computer Vision and Pattern Recognition · Computer Science 2025-08-28 Alzayat Saleh , Shunsuke Hatano , Mostafa Rahimi Azghadi

In current object detection, algorithms require the object to be directly visible in order to be detected. As humans, however, we intuitively use visual cues caused by the respective object to already make assumptions about its appearance.…

Computer Vision and Pattern Recognition · Computer Science 2022-03-18 Sascha Saralajew , Lars Ohnemus , Lukas Ewecker , Ebubekir Asan , Simon Isele , Stefan Roos

Instance shadow detection, crucial for applications such as photo editing and light direction estimation, has undergone significant advancements in predicting shadow instances, object instances, and their associations. The extension of this…

Computer Vision and Pattern Recognition · Computer Science 2024-09-25 Zhenghao Xing , Tianyu Wang , Xiaowei Hu , Haoran Wu , Chi-Wing Fu , Pheng-Ann Heng

Face detection from low-light images is challenging due to limited photos and inevitable noise, which, to make the task even harder, are often spatially unevenly distributed. A natural solution is to borrow the idea from multi-exposure,…

Computer Vision and Pattern Recognition · Computer Science 2020-07-22 Jinxiu Liang , Jingwen Wang , Yuhui Quan , Tianyi Chen , Jiaying Liu , Haibin Ling , Yong Xu

Shadows encode rich information about scene geometry and illumination, yet existing methods either predict a unified shadow mask or overlook attached shadows entirely. We address this gap by proposing a framework for jointly detecting cast…

Computer Vision and Pattern Recognition · Computer Science 2026-03-20 Shilin Hu , Jingyi Xu , Sagnik Das , Dimitris Samaras , Hieu Le

Face spoofing causes severe security threats in face recognition systems. Previous anti-spoofing works focused on supervised techniques, typically with either binary or auxiliary supervision. Most of them suffer from limited robustness and…

Computer Vision and Pattern Recognition · Computer Science 2020-05-25 Chengwei Chen , Wang Yuan , Xuequan Lu , Lizhuang Ma

Existing deep learning-based shadow removal methods still produce images with shadow remnants. These shadow remnants typically exist in homogeneous regions with low-intensity values, making them untraceable in the existing image-to-image…

Computer Vision and Pattern Recognition · Computer Science 2024-02-02 Yuhao Liu , Qing Guo , Lan Fu , Zhanghan Ke , Ke Xu , Wei Feng , Ivor W. Tsang , Rynson W. H. Lau

Shadow removal improves the visual quality and legibility of digital copies of documents. However, document shadow removal remains an unresolved subject. Traditional techniques rely on heuristics that vary from situation to situation. Given…

Computer Vision and Pattern Recognition · Computer Science 2023-05-23 Xuhang Chen , Xiaodong Cun , Chi-Man Pun , Shuqiang Wang

Accurate detection of individual tree crowns from remote sensing data poses a significant challenge due to the dense nature of forest canopy and the presence of diverse environmental variations, e.g., overlapping canopies, occlusions, and…

Computer Vision and Pattern Recognition · Computer Science 2023-10-26 Rudraksh Kapil , Seyed Mojtaba Marvasti-Zadeh , Nadir Erbilgin , Nilanjan Ray

Recent deep learning methods have achieved promising results in image shadow removal. However, their restored images still suffer from unsatisfactory boundary artifacts, due to the lack of degradation prior embedding and the deficiency in…

Computer Vision and Pattern Recognition · Computer Science 2022-12-14 Lanqing Guo , Chong Wang , Wenhan Yang , Siyu Huang , Yufei Wang , Hanspeter Pfister , Bihan Wen

We propose a novel Retinex image-decomposition network that can be trained in a self-supervised manner. The Retinex image-decomposition aims to decompose an image into illumination-invariant and illumination-variant components, referred to…

Image and Video Processing · Electrical Eng. & Systems 2021-02-09 Kouki Seo , Yuma Kinoshita , Hitoshi Kiya

Unsupervised shadow removal aims to learn a non-linear function to map the original image from shadow domain to non-shadow domain in the absence of paired shadow and non-shadow data. In this paper, we develop a simple yet efficient…

Computer Vision and Pattern Recognition · Computer Science 2021-06-01 Chao Tan , Xin Feng

Recent deep learning methods have achieved promising results in image shadow removal. However, most of the existing approaches focus on working locally within shadow and non-shadow regions, resulting in severe artifacts around the shadow…

Computer Vision and Pattern Recognition · Computer Science 2023-02-06 Lanqing Guo , Siyu Huang , Ding Liu , Hao Cheng , Bihan Wen

Recent work has shown that diffusion models can serve as powerful neural rendering engines that can be leveraged for inserting virtual objects into images. However, unlike typical physics-based renderers, these neural rendering engines are…

Computer Vision and Pattern Recognition · Computer Science 2025-12-12 Frédéric Fortier-Chouinard , Zitian Zhang , Louis-Etienne Messier , Mathieu Garon , Anand Bhattad , Jean-François Lalonde

The aim of surface defect detection is to identify and localise abnormal regions on the surfaces of captured objects, a task that's increasingly demanded across various industries. Current approaches frequently fail to fulfil the extensive…

Computer Vision and Pattern Recognition · Computer Science 2024-08-23 Blaž Rolih , Matic Fučka , Danijel Skočaj

In the light of recent analyses on privacy-concerning scene revelation from visual descriptors, we develop descriptors that conceal the input image content. In particular, we propose an adversarial learning framework for training visual…

Computer Vision and Pattern Recognition · Computer Science 2022-03-30 Tony Ng , Hyo Jin Kim , Vincent Lee , Daniel DeTone , Tsun-Yi Yang , Tianwei Shen , Eddy Ilg , Vassileios Balntas , Krystian Mikolajczyk , Chris Sweeney