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Using an SPH simulation of a star-forming region in a molecular cloud, we show that the emergence of a clump mass function (CMF) resembling the stellar initial mass function (IMF) is a ubiquitous feature of molecular cloud structure, but…

天体物理学 · 物理学 2009-11-13 Rowan J. Smith , Paul C. Clark , Ian A. Bonnell

Face clustering tasks can learn hierarchical semantic information from large-scale data, which has the potential to help facilitate face recognition. However, there are few works on this problem. This paper explores it by proposing a joint…

计算机视觉与模式识别 · 计算机科学 2023-12-08 Zhenduo Zhang

Contrastive learning based on instance discrimination trains model to discriminate different transformations of the anchor sample from other samples, which does not consider the semantic similarity among samples. This paper proposes a new…

计算机视觉与模式识别 · 计算机科学 2021-10-19 Hao Li , Xiaopeng Zhang , Hongkai Xiong

This paper presents a method that improve state-of-the-art of the concave point detection methods as a first step to segment overlapping objects on images. It is based on the analysis of the curvature of the objects contour. The method has…

计算机视觉与模式识别 · 计算机科学 2022-01-11 Miquel Miró-Nicolau , Biel Moyà-Alcover , Manuel Gonzàlez-Hidalgo , Antoni Jaume-i-Capó

Discrete particle simulations have become the standard in science and industrial applications exploring the properties of particulate systems. Most of such simulations rely on the concept of interacting spherical particles to describe the…

Large-scale face clustering has achieved significant progress, with many efforts dedicated to learning to cluster large-scale faces with supervised-learning. However, complex model design and tedious clustering processes are typical in…

计算机视觉与模式识别 · 计算机科学 2025-05-06 Junjie Liu

Robust face detection is one of the most important pre-processing steps to support facial expression analysis, facial landmarking, face recognition, pose estimation, building of 3D facial models, etc. Although this topic has been intensely…

计算机视觉与模式识别 · 计算机科学 2017-01-03 Yutong Zheng , Chenchen Zhu , Khoa Luu , Chandrasekhar Bhagavatula , T. Hoang Ngan Le , Marios Savvides

A good clustering algorithm can discover natural groupings in data. These groupings, if used wisely, provide a form of weak supervision for learning representations. In this work, we present Clustering-based Contrastive Learning (CCL), a…

计算机视觉与模式识别 · 计算机科学 2020-04-07 Vivek Sharma , Makarand Tapaswi , M. Saquib Sarfraz , Rainer Stiefelhagen

Face clustering is an essential tool for exploiting the unlabeled face data, and has a wide range of applications including face annotation and retrieval. Recent works show that supervised clustering can result in noticeable performance…

计算机视觉与模式识别 · 计算机科学 2020-04-06 Lei Yang , Dapeng Chen , Xiaohang Zhan , Rui Zhao , Chen Change Loy , Dahua Lin

Face clustering plays an essential role in exploiting massive unlabeled face data. Recently, graph-based face clustering methods are getting popular for their satisfying performances. However, they usually suffer from excessive memory…

计算机视觉与模式识别 · 计算机科学 2022-05-27 Junfu Liu , Di Qiu , Pengfei Yan , Xiaolin Wei

Partially recorded data are frequently encountered in many applications and usually clustered by first removing incomplete cases or features with missing values, or by imputing missing values, followed by application of a clustering…

统计方法学 · 统计学 2021-10-20 Emily M. Goren , Ranjan Maitra

Visual attention mechanisms are a key component of neural network models for computer vision. By focusing on a discrete set of objects or image regions, these mechanisms identify the most relevant features and use them to build more…

计算机视觉与模式识别 · 计算机科学 2021-04-08 António Farinhas , André F. T. Martins , Pedro M. Q. Aguiar

Median clustering is of great value for partitioning relational data. In this paper, a new prototype-based clustering method, called Median Evidential C-Means (MECM), which is an extension of median c-means and median fuzzy c-means on the…

人工智能 · 计算机科学 2015-01-08 Kuang Zhou , Arnaud Martin , Quan Pan , Zhun-Ga Liu

Face hallucination, which is the task of generating a high-resolution face image from a low-resolution input image, is a well-studied problem that is useful in widespread application areas. Face hallucination is particularly challenging…

计算机视觉与模式识别 · 计算机科学 2016-04-28 Oncel Tuzel , Yuichi Taguchi , John R. Hershey

Cluster analysis of biological samples using gene expression measurements is a common task which aids the discovery of heterogeneous biological sub-populations having distinct mRNA profiles. Several model-based clustering algorithms have…

统计方法学 · 统计学 2012-01-30 Alberto Cozzini , Ajay Jasra , Giovanni Montana

We investigate the power of the caustic technique for identifying substructures of galaxy clusters from optical redshift data alone. The caustic technique is designed to estimate the mass profile of galaxy clusters to radii well beyond the…

宇宙学与河外天体物理 · 物理学 2015-09-09 Heng Yu , Ana Laura Serra , Antonaldo Diaferio , Marco Baldi

This paper describes the FellWalker algorithm, a watershed algorithm that segments a 1-, 2- or 3-dimensional array of data values into a set of disjoint clumps of emission, each containing a single significant peak. Pixels below a nominated…

天体物理仪器与方法 · 物理学 2014-12-18 David Berry

Recognizing the expressions of partially occluded faces is a challenging computer vision problem. Previous expression recognition methods, either overlooked this issue or resolved it using extreme assumptions. Motivated by the fact that the…

计算机视觉与模式识别 · 计算机科学 2020-05-14 Hui Ding , Peng Zhou , Rama Chellappa

Face detection and alignment in unconstrained environment are challenging due to various poses, illuminations and occlusions. Recent studies show that deep learning approaches can achieve impressive performance on these two tasks. In this…

计算机视觉与模式识别 · 计算机科学 2016-09-21 Kaipeng Zhang , Zhanpeng Zhang , Zhifeng Li , Yu Qiao

We present a study on galaxy detection and shape classification using topometric clustering algorithms. We first use the DBSCAN algorithm to extract, from CCD frames, groups of adjacent pixels with significant fluxes and we then apply the…

天体物理仪器与方法 · 物理学 2016-10-12 A. Tramacere , D. Paraficz , P. Dubath , J. -P. Kneib , F. Courbin