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This paper aims at the main problem of existing online teaching platform about lack of interaction and explores the construction and application of the SPOC (Small Private Online Course) online learning platform. The design and implementation of the SPOC platform based on Tencent Cloud are introduced from the technical level. On this basis, teaching practice and exploration in SPOC mode including...
Towards low bit rate mobile visual search, recent works have proposed to aggregate the local features and compress the aggregated descriptor (such as Fisher vector, the vector of locally aggregated descriptors) for low latency query delivery as well as moderate search complexity. Even though Hamming distance can be computed very fast, the computational cost of exhaustive linear search over the binary...
Poor retrieval performance significantly degenerates users' experience of visual search, especially in mobile search. Ideally, users would like to be alerted when bad queries are present, which helps eliminate latency as well as waste of bandwidth, especially in 3G wireless environment. In this paper, we propose a visual query performance prediction (v-QPP) approach to predict the retrieval effectiveness...
While there are ever growing focuses on mobile visual search in recent years, a comprehensive benchmark database with rich context information (such as GPS) for fair evaluation among different strategies is still missing. This paper introduces a PKUBench benchmark for the quantitative evaluations of mobile visual search with the support of GPS. It contains 13,179 images organized into 198 distinct...
When codeword frequency meets geographical location in landmark search applications, is it still discriminative for the search procedure. In this paper, we give a systematic investigation about how geographical location affects the effectiveness of codeword frequency. We explain why the standard IDF in the BoW models is less effective in location related search applications [11][12]. Consequently,...
Online media services and electronic commerce are booming recently. Previous studies have been devoted to contextual advertising, but few work deals with interactive web advertising. In this paper, we propose to put users in the loop of collecting contextual ad information with an interaction process, establishing semantic ad links across media platforms. Given an ad video, the key frames with explicit...
Web security evaluation is an important way for resolving Web security. This paper introduces the commonly used Web security comprehensive evaluation tools. Application examples and the comparison of their abilities are also given. Some inherent flaws in these tools which use the completely automatic method are analyzed. On this basis, we integrate black box and white box testing and propose a generic...
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