17 October 2013 Smoothing parameter estimation framework for Markov random field by using contextual and spectral information
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Markov random field (MRF) is currently the most common method to find the optimal solution for the classification of image data incorporating contextual visual information. The labeling for a site in MRF is dependent on smoothing parameters. Therefore, this paper deals with the development of a new robust two-step method to determine the smoothing parameter which balances spatial and spectral energies for the purpose of maximizing the classification accuracy. Multispectral images obtained by WorldView-2 satellite were employed in this research. In the first step, a support vector machine (SVM) was used to provide a vector of multi-class probability and a class label for each pixel. Then, the summation of the maximum probability of each pixel and its 8 neighbors is calculated for a dynamic block and this value is assigned to the central pixels of each block. The blocks of each class are sorted and an equal proportion of blocks of each class with the highest probability are selected. Then, the class codes and spectral information of the selected blocks are extracted from the classified map and multispectral image, respectively. This information is used to calculate class label co-occurrence matrices of the blocks (CLCMB), class label co-occurrence matrix (CLCM) and class separability indices. Finally, different smoothing parameters are calculated and the results show that estimated smoothing parameter can produce a more accurate map.
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Hossein Aghighi, Hossein Aghighi, John Trinder, John Trinder, "Smoothing parameter estimation framework for Markov random field by using contextual and spectral information", Proc. SPIE 8892, Image and Signal Processing for Remote Sensing XIX, 88920T (17 October 2013); doi: 10.1117/12.2028701; https://doi.org/10.1117/12.2028701

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