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A common characteristic of modern web browsers is that their functionality can be extended via third-party add-ons. In this paper we focus on Chrome extensions, to which the Chrome browser exports a rich API: extensions can potentially make network requests, access the local file system, get low-level information about running processes, etc. To guard against misuse, Chrome uses a permission system...
In this paper, we introduce a novel method to detect abnormal crowd activity: crowd running suddenly. This method is based on the whole motion intensity of the crowd which can be obtained by accumulating all optical flow vectors of a frame. Then we can detect the abnormal crowd activity by setting a threshold to detect whether the motion intensity changed suddenly. However, the computation of the...
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