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There are a large number of methods for solving under-determined linear inverse problem. Many of them have very high time complexity for large datasets. We propose a new method called Two-Stage Sparse Representation (TSSR) to tackle this…

Computer Vision and Pattern Recognition · Computer Science 2015-12-09 Chengyu Peng , Hong Cheng , Manchor Ko

High-dimensional data in many machine learning applications leads to computational and analytical complexities. Feature selection provides an effective way for solving these problems by removing irrelevant and redundant features, thus…

Machine Learning · Computer Science 2019-03-19 Ali Mirzaei , Vahid Pourahmadi , Mehran Soltani , Hamid Sheikhzadeh

In classical sparse representation based classification and weighted SRC algorithms, the test samples are sparely represented by all training samples. They emphasize the sparsity of the coding coefficients but without considering the local…

Applications · Statistics 2017-02-17 Shanwen Zhang , Harry Wang , Wenzhun Huang

There are mainly two types of state-of-the-art object detectors. On one hand, we have two-stage detectors, such as Faster R-CNN (Region-based Convolutional Neural Networks) or Mask R-CNN, that (i) use a Region Proposal Network to generate…

Computer Vision and Pattern Recognition · Computer Science 2018-09-03 Petru Soviany , Radu Tudor Ionescu

This paper proposes a novel two-stage method for the classification of hyperspectral images. Pixel-wise classifiers, such as the classical support vector machine (SVM), consider spectral information only; therefore they would generate noisy…

Image and Video Processing · Electrical Eng. & Systems 2018-06-05 Raymond H. Chan , Kelvin K. Kan , Mila Nikolova , Robert J. Plemmons

A robust two-stage shape retrieval (TSR) method is proposed to address the 2D shape retrieval problem. Most state-of-the-art shape retrieval methods are based on local features matching and ranking. Their retrieval performance is not robust…

Computer Vision and Pattern Recognition · Computer Science 2016-05-04 Xiaqing Pan , Sachin Chachada , C. -C. Jay Kuo

Typical text spotters follow the two-stage spotting paradigm which detects the boundary for a text instance first and then performs text recognition within the detected regions. Despite the remarkable progress of such spotting paradigm, an…

Computer Vision and Pattern Recognition · Computer Science 2023-02-08 Jingjing Wu , Pengyuan Lyu , Guangming Lu , Chengquan Zhang , Wenjie Pei

Existing multi-person pose estimators can be roughly divided into two-stage approaches (top-down and bottom-up approaches) and one-stage approaches. The two-stage methods either suffer high computational redundancy for additional person…

Computer Vision and Pattern Recognition · Computer Science 2020-12-01 Junqi Lin , Huixin Miao , Junjie Cao , Zhixun Su , Risheng Liu

Assuming unknown classes could be present during classification, the open set recognition (OSR) task aims to classify an instance into a known class or reject it as unknown. In this paper, we use a two-stage training strategy for the OSR…

Computer Vision and Pattern Recognition · Computer Science 2022-09-30 Jingyun Jia , Philip K. Chan

In this paper, we present a subclass-representation approach that predicts the probability of a social image belonging to one particular class. We explore the co-occurrence of user-contributed tags to find subclasses with a strong…

Multimedia · Computer Science 2016-01-13 Xinchao Li , Peng Xu , Yue Shi , Martha Larson , Alan Hanjalic

Optimizing a deep neural network is a fundamental task in computer vision, yet direct training methods often suffer from over-fitting. Teacher-student optimization aims at providing complementary cues from a model trained previously, but…

Computer Vision and Pattern Recognition · Computer Science 2018-12-04 Chenglin Yang , Lingxi Xie , Chi Su , Alan L. Yuille

Pedestrian classifiers decide which image windows contain a pedestrian. In practice, such classifiers provide a relatively high response at neighbor windows overlapping a pedestrian, while the responses around potential false positives are…

Computer Vision and Pattern Recognition · Computer Science 2014-07-15 Alejandro González , Sebastian Ramos , David Vázquez , Antonio M. López , Jaume Amores

Only learning one projection matrix from original samples to the corresponding binary labels is too strict and will consequentlly lose some intrinsic geometric structures of data. In this paper, we propose a novel transition subspace…

Computer Vision and Pattern Recognition · Computer Science 2019-06-17 Zhe Chen , Xiao-Jun Wu , Josef Kittler

Recently, one-stage trackers that use a joint model to predict both detections and appearance embeddings in one forward pass received much attention and achieved state-of-the-art results on the Multi-Object Tracking (MOT) benchmarks.…

Computer Vision and Pattern Recognition · Computer Science 2022-05-12 Shuzhi Yu , Guanhang Wu , Chunhui Gu , Mohammed E. Fathy

The Two-Stage Learning-to-Defer (L2D) framework has been extensively studied for classification and, more recently, regression tasks. However, many real-world applications require solving both tasks jointly in a multi-task setting. We…

Machine Learning · Statistics 2025-08-15 Yannis Montreuil , Shu Heng Yeo , Axel Carlier , Lai Xing Ng , Wei Tsang Ooi

This paper presents a study on semi-supervised learning to solve the visual attribute prediction problem. In many applications of vision algorithms, the precise recognition of visual attributes of objects is important but still challenging.…

Computer Vision and Pattern Recognition · Computer Science 2020-07-15 Minchul Shin

Data imbalance between common and rare diseases during model training often causes intelligent diagnosis systems to have biased predictions towards common diseases. The state-of-the-art approaches apply a two-stage learning framework to…

Computer Vision and Pattern Recognition · Computer Science 2022-07-15 Chenghua Zeng , Huijuan Lu , Kanghao Chen , Ruixuan Wang , Wei-Shi Zheng

The task of single image super-resolution (SISR) aims at reconstructing a high-resolution (HR) image from a low-resolution (LR) image. Although significant progress has been made by deep learning models, they are trained on synthetic paired…

Image and Video Processing · Electrical Eng. & Systems 2019-10-15 Zhen Han , Enyan Dai , Xu Jia , Xiaoying Ren , Shuaijun Chen , Chunjing Xu , Jianzhuang Liu , Qi Tian

In computer vision, Single Image Super-Resolution (SISR) is still a difficult problem. We present ViT-SR, a new technique to improve the performance of a Vision Transformer (ViT) employing a two-stage training strategy. In our method, the…

Computer Vision and Pattern Recognition · Computer Science 2025-12-04 Aditya Chaudhary , Prachet Dev Singh , Ankit Jha

We present a new framework for self-supervised representation learning by formulating it as a ranking problem in an image retrieval context on a large number of random views (augmentations) obtained from images. Our work is based on two…

Computer Vision and Pattern Recognition · Computer Science 2020-11-23 Ali Varamesh , Ali Diba , Tinne Tuytelaars , Luc Van Gool
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