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Measuring precipitation is an important part of ground observations of the Earth’s atmosphere. Existing systems for this task focus mainly on the hydrometeors’ micro-structure (e.g., shape, size, and velocity), but seldom consider to classify them. This paper proposes a new vision-based system for precipitation observation and type recognition (POTR) comprising a single camera and other commercially...
More than ten unconnected upward positive leaders initiated from high structures in response to natural downward-moving negative leaders are analyzed. These leaders are observed by using high-speed cameras with sampling rates at the order of 104 fps (frames per second). The propagation velocity, channel width of the unconnected upward leader and the distances between it and strike point are presented...
The popularity of mobile devices, such as PDAs and SmartPhones, has grown rapidly over the last couple of years. Though most users still perform searches using desktop computers, it is expected that more and more people will also search the Web while they are on the move. In addition to text-based keyword queries, mobile devices can support richer and hybrid queries such as images, audio, video, and...
In this paper, we presented an image search service for mobile users. It can be used to acquire related information by taking and sending pictures to the server, for example, getting book reviews by a photo of the cover. The key problem here is to find images that contain the same prominent object as that in the query image. In the literature, local feature based image matching has been proven to...
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