Ian Jermyn Hiroshi Ishikawa 0002 Globally Optimal Regions and Boundaries as Minimum Ratio Weight Cycles. 1075-1088 2001 23 IEEE Trans. Pattern Anal. Mach. Intell. 10 http://www.computer.org/tpami/tp2001/i1075abs.htm db/journals/pami/pami23.html#JermynI01