Browsing by Author "Xu, Chao"

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Browsing by Author "Xu, Chao"

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  • Li, Yangxi; Geng, Bo; Tao, Dacheng; Zha, Zheng-Jun; Yang, Linjun; Xu, Chao (IEEE-inst Electrical Electronics Engineers Inc, 2012)
    Existing image retrieval systems suffer from a performance variance for different queries. Severe performance variance may greatly degrade the effectiveness of the subsequent query-dependent ranking optimization algorithms, ...
  • Geng, Bo; Tao, Dacheng; Xu, Chao; Yang, Linjun; Hua, Xian-Sheng (IEEE, 2009)
    We propose an automatic approximation of the intrinsic manifold for general semi-supervised learning problems. Unfortunately, it is not trivial to define an optimization function to obtain optimal hyperparameters. Usually, ...
  • Shi, Miaojing; Sun, Xinghai; Tao, Dacheng; Xu, Chao (ACM, 2012)
    Bag-of-visual-words (BOVW) based image representation has received intense attention in recent years and has improved content based image retrieval (CBIR) significantly. BOVW does not consider the spatial correlation between ...
  • Luo, Yong; Tao, Dacheng; Geng, Bo; Xu, Chao; Maybank, Stephen (IEEE-Inst Electrical Electronics Engineers Inc, 2013)
    It is a significant challenge to classify images with multiple labels by using only a small number of labeled samples. One option is to learn a binary classifier for each label and use manifold regularization to improve ...
  • Geng, Bo; Li, Yangxi; Tao, Dacheng; Wang, Meng; Zha, Zheng-Jun; Xu, Chao (IEEE, 2012)
    Existing video concept detectors are generally built upon the kernel based machine learning techniques, e.g., support vector machines, regularized least squares, and logistic regression, just to name a few. However, in ...
  • Li, Yangxi; Geng, Bo; Yang, Linjun; Xu, Chao; Bian, Wei (Elsevier Science Bv, 2012)
    Query difficulty estimation predicts the performance of the search result of the given query. It is a powerful tool for multimedia retrieval and receives increasing attention. It can guide the pseudo relevance feedback to ...
  • Shi, Miaojing; Xu, Ruixin; Tao, Dacheng; Xu, Chao (IEEE-Inst Electrical Electronics Engineers Inc, 2013)
    The bag-of-visual-words representation has been widely used in image retrieval and visual recognition. The most time-consuming step in obtaining this representation is the visual word generation, i.e., assigning visual ...