1. An automatic thresholding algorithm and its performance;Kittler,1984
2. An automatic thresholding method for waveform segmentation;Kittler,1984
3. Threshold selection based on a simple image statistic;Kittler;Comput. Vision Graphics Image Process,1985
4. Digital Picture Processing;Rosenfeld,1976
5. Some experiments on variable thresholding;Nagawa;Pattern Recognition,1979