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Narrowband blanket jamming is common in satellite navigation systems. To suppress narrowband jamming, this paper proposes an adaptive LMS filtering algorithm in the frequency domain by updating partial weight coefficients. Firstly this paper introduces the model and the implementation means of the algorithm, then performs contrastive analysis on the computational complexity and the convergence speed...
The corners of Harris extracted based on the image gray gradient always have detection bias, because of the unclear gray gradient near the corners. In this paper, the ‘virtual corner’ is proposed, and the environmental difference also be introduced as a criterion. It can adjust the cruel of the competitive mechanism between corners adaptively. And it can reach a good matching result by combining with...
X-ray computed tomography is an important technique for clinical diagnose and non destructive testing. In many applications a number of image processing steps are needed before the image information can be used. Obtaining a segmentation of the image is one such image processing step and also is important for applications. The conventional approach is to first reconstruct the image and conduct image...
An improved moving object segmentation approach which extracted motion field from H.264 compressed domain is proposed. Pre-treatments such as vector median filtering and forward block vector accumulation are used to obtain more obvious motion field. Then mix and hierarchical clustering algorithm based on improved k-means and EM is exploited to segment the moving on the macro-block level and on the...
In this paper, extraction of the forest tree height based on LiDAR (Light Detection and Ranging) data was studied. A simple algorithm was proposed to compensate the result computed by the DEMs of first return and last return. The satellite image download from the GoogleEarth was used to facilitate the analysis. The algorithm was tested with these data, and had been proved to be effective. Although...
It is significant to deploy a mobile sensor network periodically sweeping from the upriver to the downriver to monitor the water quality of the third large river in China. An important problem in this network is how to maximize the dynamic coverage efficiency while maintain the connectivity of network. To solve this problem, we borrow the idea of flocking-birds model in artificial life field and propose...
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