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Since the collective ratings and reviews on an online rating system have a high influence on user decisions, there exist more and more fraudulent behaviors, such as "ballot stuffing" and "bad–mouthing". Most of the current methods solve these problems by detecting one or a few malicious patterns. But they cannot solve these patterns simultaneously and cannot solve the case where...
Multi-focus image fusion in wireless visual sensor networks (WVSN) is a process of fusing two or more images to obtain a new one which contains a more accurate description of the scene than any of the individual source images. In this letter, we propose an efficient algorithm to fuse multi-focus images or videos using discrete cosine transform (DCT) based standards in WVSN. The spatial frequencies...
With the wide adoption of intelligent mobile phone with global positioning functionalities, location based services (LBS) are more and more popular. Location privacy becomes an important issue. The current methods on privacy protection can be classified into the following folds: privacy preserving LBS query in a real time manner, privacy protection on historical trajectory data publication afterwards...
Inthis paperwe presentan approach foroptical vehicle positioning (e.g. fork lifters). Our approach is motivated by planar marker detection systems like ARTag or ARToolkit, in which poses of planarmarkers relative to the camera can be determined. In contrast toexisting optical positioning systems(e.g. SkyTrax), we mount cameras on the ceiling and passive (non-electronic) planar markers on the top of...
To address the unintended lane departure problem in nowadays' vehicle safety, a novel method is proposed in this paper, to predict the tendency of lane departure. The method doesn't need a lane model to describe the center line of the lane, but just the detected lane boundary points, so can overcome the influence of lane recognition problem and reduce the effect of lane model error, which is very...
To address the local path planning problem for autonomous land vehicle in unstructured environments, a novel method combining navigation function and A* search is proposed. The computed navigation function in this paper embodies different constraints of vehicle, so in fact to be a near-feasible trajectory. Next the navigation function and sensed obstacles is used to construct the heuristic function,...
According to the postulation of Shannon's theoretical unbreakable cryptography, in practice, a pseudo-random bit sequence (PRBS) often acts as a "one-time padding" key sequence, therefore should be of good statistical properties, complex structure meanwhile simpleness in implementation. To meet these needs, a spatiotemporal chaotic map is digitized to develop a highly paralleled PRBS generator...
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