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Noncontact sleep quality monitoring and early diagnosis of sleep disorders has attracted increasing attentions recently due to its advantages over traditional Polysomnography (PSG). In this study, we proposed a novel audio-based method to estimate four sleep stages. The method consists of three steps, breathe/snore detection based on Adaptive Vertical Box (AV-Box), nonlinear feature and sleep pattern...
In this paper, we propose a novel distributed Kalman filter (KF) over sensor networks using partial diffusion strategy, where each sensor only communicates with its neighbours and individual estimation vectors are partially transmitted to obtain local ones through convex combinations under communication bandwidth constraints. Proposed solution can obtain a trade-off between communications burden and...
Single image dehazing has been a challenging prob- lem due to its ill-posed nature. While most of the existing single image based dehazing algorithms address this issue by introduc- ing certain assumptions and priors into the haze imaging model, the imaging process of imaging devices has been seldom taken into account, such as white balance and metering. In general, consumer photos are taken with...
In order to improve data transmission efficiency between ground and satellite, image compression methods have been implemented onboard for years. However, the thermal noise generated by charge-coupled device (CCD) will decrease the compression ratio of the onboard image data and there is few works to be undertaken on noise suppression oriented for increasing image compression ratio. Therefore, a Homogeneity...
After operating on orbit for certain periods, natural degradation of CCD will result in the issue that the image SNR begins to apparently decreasing. To increase image SNR, one of the feasible ways is to increase CCD integration time. However, more Gaussian-like thermal noise, which could blur the image and even decrease the compression ratio of onboard lossless compression, will be added into the...
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