Multigrid hierarchical simulated annealing method for reconstructing heterogeneous media

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
Lalit M PantMarc Secanell

Abstract

A reconstruction methodology based on different-phase-neighbor (DPN) pixel swapping and multigrid hierarchical annealing is presented. The method performs reconstructions by starting at a coarse image and successively refining it. The DPN information is used at each refinement stage to freeze interior pixels of preformed structures. This preserves the large-scale structures in refined images and also reduces the number of pixels to be swapped, thereby resulting in a decrease in the necessary computational time to reach a solution. Compared to conventional single-grid simulated annealing, this method was found to reduce the required computation time to achieve a reconstruction by around a factor of 70-90, with the potential of even higher speedups for larger reconstructions. The method is able to perform medium sized (up to 300(3) voxels) three-dimensional reconstructions with multiple correlation functions in 36-47 h.

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Sep 13, 2014·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Lalit M PantMarc Secanell

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