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Positive alpha-stable distribution is used to model the nonnegative quantity with impulsive property. Based on negative-order moments, three methods are used to estimate the parameters of positive alpha-stable distribution in this paper. First, a ratio estimator based on the ratio of negative-order moments is presented whose performance is significantly(More)
The calibration factors of synthetic aperture radar (SAR) images are generally obtained by estimation of radar system parameters based on internal calibration and external calibration. In this paper, we propose a simple but efficient method to estimate the calibration factors based on statistical modeling of scattering coefficient. Taking expectation and(More)
Generalized Rayleigh distribution was deduced for the amplitude SAR image according to the generalized central limit theorem, and the parameters were estimated by the negative order moment. Based on the disadvantage of single-point estimation, global search was suggested to achieve the optimal parameters. Owing to lack of analytical expression of the(More)
This paper proposes a new method to track and measure 3D information of moving object by using two PTZ(Pan-tilt Zoom) cameras. In our 3D measurement method, the optical axis of two PTZ cameras are not required to be parallel or a fixed angle, the 3D information can be measured even though the pan and tilt of two PTZ cameras are changed freely. The SIFT(More)
Multiplicative noise makes the interpretation of image extremely difficult, and the fixed-size window filters cannot achieve good trade-off between noise suppression and edge keeping. Based on adaptive windowing and local structure detection, a new filtering algorithm of multiplicative noise is developed in this paper. The sliding window size is(More)
The parameters of K distribution are estimated in this paper, and the log-cumulant estimator is proposed based on second-kind statistics. The performance of the log-cumulant estimator is tested on the Monte Carlo simulations. Parameter estimation results demonstrate that the log-cumulant estimator leads to high estimation accuracy for the small values of(More)
This paper present a new distributed CFAR (constant false alarm rate) detector based on the adaptive censored cell-averaging CFAR technique. In the scheme, every local decision of individual detector, resulting from the comparison between its sample in test cell and the estimate of clutter power level of its reference samples, takes the value zero or one.(More)
The appearance of speckle makes it difficult for image segmentation, classification and target detection. By analyzing MMSE filter and the enhanced one, it can be seen that although these filters are better trade-off between noise reduction and fine detail preserving, a basic premise is required for all statistic filters that the sample mean and variance of(More)