@Article{MignotteIP00, author = {M. Mignotte and C. Collet and P. P\'erez and P. Bouthemy}, title = {Sonar image segmentation using an unsupervised hierarchical {MRF} model}, journal = {IEEE Trans. on Image Processing}, year = {2000}, volume = {9}, number = {7}, pages = {1216-1231} }