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A recent trend in data mining has explored (hyper)graph clustering algorithms for data with categorical relationship types. Such algorithms have applications in the analysis of social, co-authorship, and protein interaction networks, to…

Data Structures and Algorithms · Computer Science 2024-01-09 Alex Crane , Brian Lavallee , Blair D. Sullivan , Nate Veldt

Learning for manipulation requires using policies that have access to rich sensory information such as point clouds or RGB images. Point clouds efficiently capture geometric structures, making them essential for manipulation tasks in…

Image-to-point cloud registration methods typically follow a coarse-to-fine pipeline, extracting patch-level correspondences and refining them into dense pixel-to-point matches. However, in scenes with repetitive patterns, images often lack…

Computer Vision and Pattern Recognition · Computer Science 2026-03-30 Zhixin Cheng , Jiacheng Deng , Xinjun Li , Bohao Liao , Li Liu , Xiaotian Yin , Baoqun Yin , Tianzhu Zhang

Downsampling and feature extraction are essential procedures for 3D point cloud understanding. Existing methods are limited by the inconsistent point densities of different parts in the point cloud. In this work, we analyze the limitation…

Computer Vision and Pattern Recognition · Computer Science 2022-12-06 Qi Wang , Sheng Shi , Jiahui Li , Wuming Jiang , Xiangde Zhang

To achieve visual consistency in composite images, recent image harmonization methods typically summarize the appearance pattern of global background and apply it to the global foreground without location discrepancy. However, for a real…

Computer Vision and Pattern Recognition · Computer Science 2022-04-12 Ziyue Zhu , Zhao Zhang , Zheng Lin , Ruiqi Wu , Zhi Chai , Chun-Le Guo

How to extract significant point cloud features and estimate the pose between them remains a challenging question, due to the inherent lack of structure and ambiguous order permutation of point clouds. Despite significant improvements in…

Computer Vision and Pattern Recognition · Computer Science 2021-12-14 Zhu Xu , Zhengyao Bai , Huijie Liu , Qianjie Lu , Shenglan Fan

Point cloud upsampling is to densify a sparse point set acquired from 3D sensors, providing a denser representation for the underlying surface. Existing methods divide the input points into small patches and upsample each patch separately,…

Computer Vision and Pattern Recognition · Computer Science 2022-07-13 Chen Long , Wenxiao Zhang , Ruihui Li , Hao Wang , Zhen Dong , Bisheng Yang

Point cloud segmentation is fundamental in understanding 3D environments. However, current 3D point cloud segmentation methods usually perform poorly on scene boundaries, which degenerates the overall segmentation performance. In this…

Computer Vision and Pattern Recognition · Computer Science 2022-03-14 Liyao Tang , Yibing Zhan , Zhe Chen , Baosheng Yu , Dacheng Tao

In this paper, we tackle the problem of performing consistent and unified modifications across a set of related images. This task is particularly challenging because these images may vary significantly in pose, viewpoint, and spatial…

Computer Vision and Pattern Recognition · Computer Science 2026-03-27 Yue Ma , Xinyu Wang , Qianli Ma , Qinghe Wang , Mingzhe Zheng , Xiangpeng Yang , Hao Li , Chongbo Zhao , Jixuan Ying , Harry Yang , Hongyu Liu , Qifeng Chen

Estimating the complete 3D point cloud from an incomplete one is a key problem in many vision and robotics applications. Mainstream methods (e.g., PCN and TopNet) use Multi-layer Perceptrons (MLPs) to directly process point clouds, which…

Computer Vision and Pattern Recognition · Computer Science 2020-07-21 Haozhe Xie , Hongxun Yao , Shangchen Zhou , Jiageng Mao , Shengping Zhang , Wenxiu Sun

Over-segmentation, or super-pixel generation, is a common preliminary stage for many computer vision applications. New acquisition technologies enable the capturing of 3D point clouds that contain color and geometrical information. This 3D…

Computer Vision and Pattern Recognition · Computer Science 2020-04-28 Yizhak Ben-Shabat , Tamar Avraham , Michael Lindenbaum , Anath Fischer

6D object pose estimation is widely applied in robotic tasks such as grasping and manipulation. Prior methods using RGB-only images are vulnerable to heavy occlusion and poor illumination, so it is important to complement them with depth…

Computer Vision and Pattern Recognition · Computer Science 2021-04-07 Yi Cheng , Hongyuan Zhu , Ying Sun , Cihan Acar , Wei Jing , Yan Wu , Liyuan Li , Cheston Tan , Joo-Hwee Lim

In recent years, the fusion of camera data with LiDAR measurements has emerged as a powerful approach to enhance spatial understanding. This study introduces a novel, hardware-agnostic methodology that generates colourised point clouds from…

Computer Vision and Pattern Recognition · Computer Science 2025-10-01 Pasindu Ranasinghe , Dibyayan Patra , Bikram Banerjee , Simit Raval

With the advancement in image capturing device, the image data been generated at high volume. If images are analyzed properly, they can reveal useful information to the human users. Content based image retrieval address the problem of…

Computer Vision and Pattern Recognition · Computer Science 2009-10-13 Sanjay Silakari , Mahesh Motwani , Manish Maheshwari

Regressing the illumination of a scene from the representations of object appearances is popularly adopted in computational color constancy. However, it's still challenging due to intrinsic appearance and label ambiguities caused by unknown…

Computer Vision and Pattern Recognition · Computer Science 2019-12-25 Huanglin Yu , Ke Chen , Kaiqi Wang , Yanlin Qian , Zhaoxiang Zhang , Kui Jia

As being one of the main representation formats of 3D real world and well-suited for virtual reality and augmented reality applications, point clouds have gained a lot of popularity. In order to reduce the huge amount of data, a…

Multimedia · Computer Science 2022-11-22 Pan Gao , Shengzhou Luo , Manoranjan Paul

In this paper, we propose a pipeline to generate 3D point cloud of an object from a single-view RGB image. Most previous work predict the 3D point coordinates from single RGB images directly. We decompose this problem into depth estimation…

Computer Vision and Pattern Recognition · Computer Science 2020-10-27 Wei Zeng , Sezer Karaoglu , Theo Gevers

Depth estimation is an important step in many computer vision problems such as 3D reconstruction, novel view synthesis, and computational photography. Most existing work focuses on depth estimation from single frames. When applied to…

Computer Vision and Pattern Recognition · Computer Science 2023-08-08 Numair Khan , Eric Penner , Douglas Lanman , Lei Xiao

In this paper, we propose a novel multi-color balance method for reducing color distortions caused by lighting effects. The proposed method allows us to adjust three target-colors chosen by a user in an input image so that each target color…

Multimedia · Computer Science 2021-05-24 Teruaki Akazawa , Yuma Kinoshita , Hitoshi Kiya

An instance of colorful k-center consists of points in a metric space that are colored red or blue, along with an integer k and a coverage requirement for each color. The goal is to find the smallest radius \r{ho} such that there exist…

Data Structures and Algorithms · Computer Science 2020-07-09 Xinrui Jia , Kshiteej Sheth , Ola Svensson