Development of two-directional image processing algorithm to measure bubble size and volume in two-phase flow

Recently, Digital Image Processing (DIP) has been focused as the method for the analysis of two-phase flow such as subcooled boiling phenomena. Specially, in many studies on the measurement of the bubble size, DIP with high speed camera technique is used. In the previous studies, the images were taken in one-direction and were considered as an axisymmetric object such as a sphere to calculate the volume or equivalent diameter. However, since the object has the three-dimensional degrees of freedom, one-directional image processing is limited to axisymmetric objects. In this paper, to overcome this limitation of one-directional image processing, the simple algorithm was developed using two images for a same object in an orthogonal direction. The main structure of algorithm based on an active contour model is the reconstruction into three-dimensional objects from two images. The developed two-directional image processing is applied to the virtual bubble images