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Marine radio-navigation system is based on spread spectrum system, whose working environment is complexity and usually works in a bad channel conditions. Strong sky-wave interference in the system affected the positioning accuracy seriously. Sky-wave is a typical fast time-varying signal with large range of amplitude and rapid changing. The general multi-user detection algorithm can not effectively...
Edge detecting is the most important pre-processing in image analysis, feature extraction and recognition. Gradient is a basilic measure of edge images, and we can calculate the values of magnitude and rotation of edges with it. We analyse the first-order difference detectors first, such as Robert, Prewitt and Sobel detectors, then we analyse the Laplacian detector, that is a second-order difference...
This paper proposes that box-counting dimension method be adopted for the analysis of edge images detected with classical edge detectors. By using this method, the authors find that the number of ln(N(l)) and ln(l) of binary image is greater than that of edge images; and at the resolution of 512??512 in pixel, ln(N(l)) and ln(l) of the edges images is more disorder than that of binary images when...
This paper proposes that multifractal analysis method be adopted for the analysis of edge images detected with classical edge detectors. We analyze the direct multifractal analysis method based on box-counting method with experimental images, and determine the value of f(q) and a(q). By using this method, we find that the edge images detected by difference edge detectors are similar, but, the multifractal...
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