Zhang Wenyin Jin Ningde Lin Xia Nie Zhiqiang Bubble Image Segmentation of Gas/Liquid Two-Phase Flow Based on Improved Canny Operator. 799-801 2008 CSSE (1) http://dx.doi.org/10.1109/CSSE.2008.1396 conf/csse/2008-1 db/conf/csse/csse2008-1.html#WenyinNXZ08