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Multi-modal gray-level histogram modeling and decomposition
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DOI：10.1016/S0262-8856(01)00095-6.png)
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In this paper, we present a novel multi-modal histogram thresholding method in which no a priori knowledge about the number of clusters to be extracted is needed. The proposed method combines regularization and statistical approaches. By converting the approaching histogram thresholding problem to the mixture Gaussian density modeling problem, threshold values can be estimated precisely according to the parameters belonging to each contiguous cluster. Computational complexity has been greatly reduced since our method does not employ conventional iterative parameter refinement. Instead, an optimal parameter estimation interval was defined before the estimation procedure. This predefined optimal estimation interval reduces time consumption while other histogram decomposition based methods search all feature space to locate an estimation interval for each candidate cluster. Experimental results with both simulated data and real images demonstrate the robustness of our method. (C) 2002 Elsevier Science B.V. All rights reserved.
Keyword:
image thresholding
multi-modal histogram analysis
Gaussian mixture density
histogram decomposition
parameter estimation
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