Image classification by visual bag-of-words refinement and reduction

This paper presents a new framework for visual bag-of-words (BOW) refinement and reduction to overcome the drawbacks associated with the visual BOW model which has been widely used for image classification. Although very influential in the literature, the traditional visual BOW model has two distinct drawbacks. Firstly, for efficiency purposes, the visual vocabulary is commonly constructed by directly clustering the low-level visual feature vectors extracted from local keypoints, without considering the high-level semantics of images. That is, the visual BOW model still suffers from the semantic gap, and thus may lead to significant performance degradation in more challenging tasks (e.g. social image classification). Secondly, typically thousands of visual words are generated to obtain better performance on a relatively large image dataset. Due to such large vocabulary size, the subsequent image classification may take sheer amount of time. To overcome the first drawback, we develop a graph-based method for visual BOW refinement by exploiting the tags (easy to access although noisy) of social images. More notably, for efficient image classification, we further reduce the refined visual BOW model to a much smaller size through semantic spectral clustering. Extensive experimental results show the promising performance of the proposed framework for visual BOW refinement and reduction

A Ming Confucian’s World

A forgotten century marks the years between the Ming dynasty's (1368–1644) turbulent founding and its sixteenth-century age of exploration and economic transformation. In this period of social stability, retired scholar-official Lu Rong chronicled his observations of Chinese society in Miscellaneous Records from the Bean Garden (Shuyuan zaji). Openly expressing his admirations and frustrations, Lu provides a window into the quotidian that sets Bean Garden apart from other works of the biji genre of "informal notes."Mark Halperin organizes a translated selection of Lu's accounts from Miscellaneous Records from the Bean Garden to create a panorama of Ming life. A man of unusual curiosity, Lu describes multiple social classes, ethnicities, and locales in his accounts of political intrigues, farming techniques, religious practices, etiquette, crime, and family life. Centuries after their composition, Lu's words continue to provide a richly textured portrait of China on the cusp of the early modern era