Spatio-temporal optimization method for determining motion vector fields under non-stationary illumination

The present paper proposes two generalized gradient-based methods. The meth ods assume that motion vector fields are stationary within a large temporal domain. In addition, they assume that an unknown parameter representing th e effect of non-stationary illumination is changing within the same tempora l domain. For approximation of the unknown parameter, one of the methods ut ilizes a polynomial function of time; the other assumes short time constanc y of the unknown parameter within a small temporal domain. Through analysis of synthetic and real image sequences, the latter method is confirmed to b e more accurate and robust. (C) 2000 Elsevier Science B.V. All rights reser ved.