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This paper investigates the joint robust beamforming and artificial noise design in two-user interference networks, where one of the two pairs is wiretapped by an external eavesdropper, and only imperfect eavesdropper's channel state information (ECSI) is available for the two pairs. Under individual transmission power constraint, our goal is to maximize the worst-case achievable secrecy rate of the...
Noisy whisper contaminated by different types of noise are enhanced by compressive sensing method. The intelligibility performance of the enhanced whisper is measured using the short time objective index (STOI). To assess the effect of spectra density on compressive sensing, the real-valued discrete Gabor transform is used to transform the noisy whisper into the time-frequency domain. Experimental...
Penalized likelihood (PL) image reconstruction has been developed for emission tomography to improve the image quality of reconstructed images. One challenge in PL reconstruction is that the selection of a proper regularization parameter to achieve a balance between the likelihood function and penalty function can be difficult. Here we present a novel method to choose the regularization parameter...
Reconstruction from only a limited number of projections is an important problem in medical imaging. In this paper, a novel kernel-based limited-view CT reconstruction method is proposed. First based on the classical FDK algorithm, we derive the reconstruction kernel. Then the FDK kernel is truncated to reduce the noises aroused by the oscillations of the kernel. And a novel anisotropic diffusion...
The Edge-Preserving Surface Estimation based on statistical jump regression analysis is a powerful approach for image denoising. However, it requires an accessorial corner-preserving technique in which a corner threshold needs to be tuned. In this paper, we suggest a novel procedure based on local segmentation using Normalized Cuts which can well preserve the edges and corners at the same time without...
The risk of X-ray exposure will increase when applying the 3D-CT methods such as MDCT. To decrease this risk it is better to lower the dose-level of X-ray, but it reduces the resolution of obtained image and causes negative effect on imaging diagnosis. We think that 3D-filtering methods will recover the reduction. In order to obtain a better filtered result, 3D linear and non-linear filters are designed...
It is well known the standard particle filter has a good effect when the observation accuracy is low. However, if the observation accuracy is high, the likelihood distribution may become aiguilles-like and locate at the tail of the prior distribution curve; this will make the filter diverge. To solve the problem, a kind of adaptive particle filter is proposed in this paper. The adaptive particle filter...
In this paper, we study a signal processing problem which concentrates on outlier detection and data mining in order to rediscover some useful information. Moreover, the great difficulty of the subject is caused by both the external environment and the internal mechanism. In the external, owing to limit of impersonal condition, such as, realistic disturbance from noise signal can not avoid. In the...
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