arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1205.2663cs.CV
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视觉词典是可推广的吗?

Are visual dictionaries generalizable?

University of Campinas(坎皮纳斯州立大学)

Otavio A. B. Penatti, Eduardo Valle, Ricardo da S. Torres

摘要:

基于视觉词典的中级特征是当今图像分类和检索系统的基石。这些最先进的表示方法主要取决于码本(视觉词典)的选择,而码本通常来自数据集。在通用的动态图像集合(例如,Web),不能为了提取代表性字典而具有整个集合。然而,基于字典只反映低级别外观的多样性,不捕捉语义的假设,我们认为,字典的基础上的一个小的数据子集,甚至在一个完全不同的数据集,是能够产生一个很好的表示,只要所选择的图像跨越足够多样化的低级别特征空间的一部分。我们的实验证实了这一假设,打开的机会,大大减轻了负担,在产生的码本,并确认在大规模的动态环境中采用视觉词典的可行性。

英文摘要:

Mid-level features based on visual dictionaries are today a cornerstone of systems for classification and retrieval of images. Those state-of-the-art representations depend crucially on the choice of a codebook (visual dictionary), which is usually derived from the dataset. In general-purpose, dynamic image collections (e.g., the Web), one cannot have the entire collection in order to extract a representative dictionary. However, based on the hypothesis that the dictionary reflects only the diversity of low-level appearances and does not capture semantics, we argue that a dictionary based on a small subset of the data, or even on an entirely different dataset, is able to produce a good representation, provided that the chosen images span a diverse enough portion of the low-level feature space. Our experiments confirm that hypothesis, opening the opportunity to greatly alleviate the burden in generating the codebook, and confirming the feasibility of employing visual dictionaries in large-scale dynamic environments.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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