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Aiming at the speckle noise in laser active imaging, a denoising algorithm combining improved wavelet threshold method with non-local mean(NLM) filtering is proposed. Firstly, noise analysis of laser active imaging is performed. Secondly, the speckle noise is converted into additive noise by logarithmic transformation. Thirdly, the image is decomposed into two layers by wavelet transform, then improved...
Electro-hydraulic servo mechanism is the actuator of the missile to adjust the implementing agencies, the frequency characteristic test is important content in the test. In order to reduce the dependency of the filter on the statistical characteristics of the noise during the testing process, an improved adaptive strong tracking filter (ADSTK) is proposed to suppress the noise in the frequency characteristic...
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