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This paper introduces an improved level set algorithm based on Chan-Vese (C-V) models via reaction diffusion for atrial body segmentation. Before atrial body segmentation, a set of methods are used to extract left atrium and left ventricular as a preprocessing work. This set of methods consist of the following steps. First, a bilateral filtering operation is applied to remove random noise caused by...
It is important to estimate the multipath time delay in underwater communication and target positioning. Based on the good time delay resolution, wideband signal is used to estimate time delay conventionally, in some situation, it is hard to use wideband signals. Focused on the narrowband signal multipath time delay estimating, an algorithm based on spectral subtraction in logarithm domain was proposed...
In the paper, firstly different wavelet bases are selected to denoise the sunspot activity data through the wavelet transformation, then the EMD analysis method are taken to decompose these two sets of signals, subsequently the physical IMF period of each layer are obtained by using FFT transform. Through the comparisons between the obtained results and the public time-scale of solar activity, we...
In order to resolve collaborative filtering recommendation system recommended decline in the quality for the sparse dataset, a dynamic Item-based weight collaborative recommendation algorithm is presented, which user's preference weight items vector set is constructed based on filtering user's evaluating data and the data rate measured and time-weighted are done, then the Item-based & weighted...
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