Abstract
A measurement system of dynamic image motions is developed by the use of spatial filters which are implemented with electronic circuits and video signals. The conventional spatial filter method, developed to measure the translating velocity of object motions, is not suitable to measure object displacement precisely. A pair of electronic spatial filters, of which phase are orthogonal to each other, forms a Hilbert transform pair and, therefore, allows object displacement to be measured as well as velocity. In addition, a complex logarithmic mapping of dynamic images will transform scaling and rotating image motions to translating ones independent of one another. These motion parameters, therefore, can be measured by utilizing the spatial filter method on the transformed domain. Originally developed for translation velocity measurement applications, the spatial filter method, implemented with electronic devices, now has capabilities to measure the global parameters of object motions.
