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Latent visual context learning for web image applications
Authors:Wengang Zhou  Qi Tian  Yijuan Lu  Linjun Yang  Houqiang Li
Affiliation:1. School of Information Science and Technology, Yunnan Normal University, Kunming 650500, China;2. The Laboratory of Pattern Recognition and Artificial Intelligence, Yunnan Normal University, Kunming, Yunnan 650500, China;3. NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore 119260, Singapore
Abstract:Recently, image representation based on bag-of-visual-words (BoW) model has been popularly applied in image and vision domains. In BoW, a visual codebook of visual words is defined, usually by clustering local features, to represent any novel image with the occurrence of its contained visual words. Given a set of images, we argue that the significance of each image is determined by the significance of its contained visual words. Traditionally, the significances of visual words are defined by term frequency-inverse document frequency (tf-idf), which cannot necessarily capture the intrinsic visual context. In this paper, we propose a new scheme of latent visual context learning (LVCL). The visual context among images and visual words is formulated from latent semantic context and visual link graph analysis. With LVCL, the importance of visual words and images will be distinguished from each other, which will facilitate image level applications, such as image re-ranking and canonical image selection.We validate our approach on text-query based search results returned by Google Image. Experimental results demonstrate the effectiveness and potentials of our LVCL in applications of image re-ranking and canonical image selection, over the state-of-the-art approaches.
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