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Target localization based on time difference of arrival (TDOA) measurements has important applications in sonar, radar and sensor networks. This paper simply introduced the target localization principle of moving emitter and the position location algorithm. Further more presented an improved particle swarm optimization with stochastic inertia weight and(More)
For complicated structural components characterized by wide X-ray attenuation ranges, the conventional computed tomography (CT) imaging using a single tube-voltage at each rotation angle cannot obtain all structural information. This limitation results in a shortage of CT information, because the effective thickness of the components along the direction of(More)
A fast and robust skew detection for scanned document images based on the improved piecewise covering by parallelograms is proposed in this papper. Comparison with the original PCP algorithm, the skew detection of the proposed algorithm is more applicable on vertical textlines documents, and is not sensitive to the noise. The experiment results show that(More)
We propose two variable weighted iterative reconstruction algorithms (VW-ART and VW-OS-SART) to improve the algebraic reconstruction technique (ART) and simultaneous algebraic reconstruction technique (SART) and establish their convergence. In the two algorithms, the weighting varies with the geometrical direction of the ray. Experimental results with both(More)
In the process of X-ray digital imaging detection, previous test usually adopts the projection data of 360° to reconstruct. But in practical test, it's often restricted to the installation of the equipment and the cost, so it cannot meet the condition of reconstruction. This paper studies a method to solve the coordinate of circle center about a(More)
In this paper an algorithm is presented for calculating the radiological path in CT image reconstruction. Based on the coordinate component of the intersections the lengths of the voxels intersected with this ray are rapidly calculated. Meanwhile, after determining the index of the first voxel intersected with the ray, the indices of the remaining voxels(More)
A method that can fast, real-time get the projection matrix in ART reconstruction is proposed based on helical cone-beam CT trajectory in this paper. For a given ray this method can rapidly acquire the indices and corresponding lengths of the voxels passed through by this ray through sorting the intersections between the ray and mesh planes. Meanwhile we(More)
—Weighted linear regression method has been widely applied for image reconstruction in computed tomography. In this paper we propose an approach based on the ridge regression method and derive two ordered-subset reconstruction algorithms from this framework. The convergence properties of the algorithms are validated by recent results on the ordered-subset(More)
—Ordered-subset simultaneous algebraic reconstruction technique (OS-SART) was studied by Ge Wang and Ming Jiang in 2004. It accelerate the convergence of SART, but it has some disadvantages, such as increasing the number of subsets accelerates iterative convergence, but there is a point beyond which image quality degrades due to a lack of statistical(More)
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