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We present a novel denoising scheme via Radon transform-based adaptive vector directional median filters named adaptive directional vector median filter (AD-VMF) to suppress noise for microseismic downhole dataset. AD-VMF contains three major steps for microseismic downhole data processing: (i) applying Radon transform on the microseismic data to obtain the parameters of the waves, (ii) performing...
An image processing method for the calculation of waveguide invariant (beta) with passive sonar lofargram image is presented in this paper. Concise formula for calculating beta was then derived by finding the two-dimensional Fourier transform ridges of the lofargrarns. The algorithm was exercised for a Pekeris waveguide and a simulated shallow water waveguide containing thermoclines with source depth...
In the paper, to improve the signal detection performance in an oceanic reverberation environment, the algorithm based on whiten filter, beamforming, and mathematical morphology from image processing was presented as well as the parameters selection method of the detector. The result of an oceanic experimentation presents that the algorithm does improve the performance in the oceanic reverberation...
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