Hi, Weber
When we calculate bubble velocity between two frames, the main difficulty is that bubble velocity is uncertain and the shape of bubble can be deformed. It means that it may be hard to track bubbles between two subsequent frames , especially when there is a group of bubbles in the bubbling bed, in which the split and coalescence of bubbles make this problem more tough. That is, the displacement of bubble is difficult to be determined. Due to the uncertain velocity of bubble, the fps of output files is also hard to be determined. I have reviewed some relevant paper, but, I haven’t found a convincing method to get over this problem. What do you think of this problem? What is your deep insight?