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In this paper, we study the problem of training large-scale face identification model with imbalanced training data. This problem naturally exists in many real scenarios including large-scale celebrity recognition, movie actor annotation,…

Computer Vision and Pattern Recognition · Computer Science 2018-03-19 Yandong Guo , Lei Zhang

Current methods for developing foundation models in medical image segmentation rely on two primary assumptions: a fixed set of classes and the immediate availability of a substantial and diverse training dataset. However, this can be…

Computer Vision and Pattern Recognition · Computer Science 2024-05-28 Xiaoyang Chen , Hao Zheng , Yifang Xie , Yuncong Ma , Tengfei Li

Quantitative imaging is an important feature of spectral X-ray and CT systems, especially photon-counting CT (PCCT) imaging systems, which is achieved through material decomposition (MD) using spectral measurements. In this work, we present…

Medical Physics · Physics 2026-03-04 Sen Wang , Yirong Yang , Jooho Lee , Grant M. Stevens , Adam S. Wang

In unsupervised feature learning, sample specificity based methods ignore the inter-class information, which deteriorates the discriminative capability of representation models. Clustering based methods are error-prone to explore the…

Computer Vision and Pattern Recognition · Computer Science 2020-07-16 Yifei Zhang , Chang Liu , Yu Zhou , Wei Wang , Weiping Wang , Qixiang Ye

Image retrieval task consists of finding similar images to a query image from a set of gallery (database) images. Such systems are used in various applications e.g. person re-identification (ReID) or visual product search. Despite active…

Computer Vision and Pattern Recognition · Computer Science 2021-04-29 Mikolaj Wieczorek , Barbara Rychalska , Jacek Dabrowski

Although recent point cloud analysis achieves impressive progress, the paradigm of representation learning from a single modality gradually meets its bottleneck. In this work, we take a step towards more discriminative 3D point cloud…

Computer Vision and Pattern Recognition · Computer Science 2022-10-11 Xu Yan , Heshen Zhan , Chaoda Zheng , Jiantao Gao , Ruimao Zhang , Shuguang Cui , Zhen Li

In this paper, we describe our method for the ISIC 2019 Skin Lesion Classification Challenge. The challenge comes with two tasks. For task 1, skin lesions have to be classified based on dermoscopic images. For task 2, dermoscopic images and…

Computer Vision and Pattern Recognition · Computer Science 2019-10-10 Nils Gessert , Maximilian Nielsen , Mohsin Shaikh , René Werner , Alexander Schlaefer

Class imbalance is a fundamental challenge in medical image segmentation, where frequent classes typically dominate training at the expense of rare classes. Loss-based approaches mitigate imbalance by reweighting the per-pixel loss within…

Image and Video Processing · Electrical Eng. & Systems 2026-05-21 Iason Skylitsis , Dimitrios Karkalousos , Ivana Išgum

Deep machine learning models including Convolutional Neural Networks (CNN) have been successful in the detection of Mild Cognitive Impairment (MCI) using medical images, questionnaires, and videos. This paper proposes a novel Multi-branch…

Computer Vision and Pattern Recognition · Computer Science 2024-01-08 Jian Sun , Hiroko H. Dodge , Mohammad H. Mahoor

A low-rank transformation learning framework for subspace clustering and classification is here proposed. Many high-dimensional data, such as face images and motion sequences, approximately lie in a union of low-dimensional subspaces. The…

Computer Vision and Pattern Recognition · Computer Science 2014-03-11 Qiang Qiu , Guillermo Sapiro

In real-world clinical settings, traditional deep learning-based classification methods struggle with diagnosing newly introduced disease types because they require samples from all disease classes for offline training. Class incremental…

Machine Learning · Computer Science 2024-06-11 Sana Ayromlou , Teresa Tsang , Purang Abolmaesumi , Xiaoxiao Li

Regression learning is classic and fundamental for medical image analysis. It provides the continuous mapping for many critical applications, like the attribute estimation, object detection, segmentation and non-rigid registration. However,…

Computer Vision and Pattern Recognition · Computer Science 2022-07-04 Chaoyu Chen , Xin Yang , Ruobing Huang , Xindi Hu , Yankai Huang , Xiduo Lu , Xinrui Zhou , Mingyuan Luo , Yinyu Ye , Xue Shuang , Juzheng Miao , Yi Xiong , Dong Ni

Face recognition (FR) has made extraordinary progress owing to the advancement of deep convolutional neural networks. However, demographic bias among different racial cohorts still challenges the practical face recognition system. The race…

Computer Vision and Pattern Recognition · Computer Science 2021-08-12 Yong Li , Yufei Sun , Zhen Cui , Shiguang Shan , Jian Yang

Background and Objective: Colorectal cancer is a high mortality cancer. Clinical data analysis plays a crucial role in predicting the survival of colorectal cancer patients, enabling clinicians to make informed treatment decisions. However,…

Machine Learning · Computer Science 2023-09-06 Sadegh Soleimani , Mahsa Bahrami , Mansour Vali

We propose a simple modification from a fixed margin triplet loss to an adaptive margin triplet loss. While the original triplet loss is used widely in classification problems such as face recognition, face re-identification and…

Computer Vision and Pattern Recognition · Computer Science 2021-07-14 Mai Lan Ha , Volker Blanz

This paper considers the problem of error correction in multi-class classification of face images on unbalanced samples. The study is based on the analysis of a data frame containing images labeled by seven different emotional states of…

Computer Vision and Pattern Recognition · Computer Science 2025-10-07 Andrey A. Lebedev , Victor B. Kazantsev , Sergey V. Stasenko

Image denoising of low-dose computed tomography (LDCT) is an important problem for clinical diagnosis with reduced radiation exposure. Previous methods are mostly trained with pairs of synthetic or misaligned LDCT and normal-dose CT (NDCT)…

Image and Video Processing · Electrical Eng. & Systems 2025-02-04 Junhao Long , Fengwei Yang , Juncheng Yan , Baoping Zhang , Chao Jin , Jian Yang , Changliang Zou , Jun Xu

Few-shot medical image segmentation has achieved great progress in improving accuracy and efficiency of medical analysis in the biomedical imaging field. However, most existing methods cannot explore inter-class relations among base and…

Computer Vision and Pattern Recognition · Computer Science 2024-06-10 Yumin Zhang , Hongliu Li , Yajun Gao , Haoran Duan , Yawen Huang , Yefeng Zheng

Despite the promising performance achieved by current semi-supervised models in segmenting individual medical targets, many of these models suffer a notable decrease in performance when tasked with the simultaneous segmentation of multiple…

Computer Vision and Pattern Recognition · Computer Science 2025-04-02 You Wang , Zekun Li , Lei Qi , Qian Yu , Yinghuan Shi , Yang Gao

Learning from triplet comparison data has been extensively studied in the context of metric learning, where we want to learn a distance metric between two instances, and ordinal embedding, where we want to learn an embedding in an Euclidean…

Machine Learning · Computer Science 2020-04-21 Zhenghang Cui , Nontawat Charoenphakdee , Issei Sato , Masashi Sugiyama