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In this paper, the concept of algebraic accuracy of zero-crossing based edge detector is proposed. Combined with the optimal criteria for zero-crossing based edge detector, a high-accuracy edge detector for step edges is given. Based on this, some Laplacian operator based masks are given. For extracting the edges objectively, an unsupervised selection strategy of the threshold is introduced. Finally,...
Magnetic resonance electrical impedance tomography (MREIT) is a new technique to recover the conductivity of biologic tissue from the induced magnetic flux density. This paper proposes an inversion scheme for recovering the conductivity from one component of the magnetic field based on the nonlinear integral equation method. To apply magnetic fields corresponding to two incoherent injected currents,...
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