Rm. Ford et Rn. Strickland, REPRESENTING AND VISUALIZING FLUID-FLOW IMAGES AND VELOCIMETRY DATA BY NONLINEAR DYNAMICAL-SYSTEMS, Graphical models and image processing, 57(6), 1995, pp. 462-482
Citations number
29
Categorie Soggetti
Computer Sciences, Special Topics","Computer Science Software Graphycs Programming
Nonlinear phase portraits are employed to represent the streamlines of
scalar flow images generated by particle tracing experiments. The flo
w fields are decomposed into simple component flows based on the criti
cal point behavior. A Taylor series model is assumed for the velocity
components, and the model coefficients are computed by considering bot
h local critical point and global how field behavior. A merge and spli
t procedure for complex flows is presented, in which patterns of neigh
boring critical point regions are combined and modeled. The concepts a
re extended to the compression of vector field data by using orthogona
l polynomials derived from the Taylor series model. A critical point s
cheme and a block transform are presented. They are applied to velocit
y fields measured in particle image velocimetry experiments and genera
ted by computer simulations. Compression ratios ranging from 15:1 to 1
00:1 are achieved. (C) 1995 Academic Press, Inc.