The purpose of these few pages is to give an overview of a new approach to optic flow computation. This new approach relies on a fast discrete wavelet analysis of the image sequence. It can be compared to a limited extent with filtered differential methods (Weber et Malik), although a more precise description for the method presented hereafter is projected differential method. Analytic wavelets are used for our purpose. This method also measures illumination changes in the picture sequence.
The main difficulty in this contribution is the construction of analytic wavelets that are scale separable, as well as their derivatives.
The main advantage is a reduced computational cost, since expensive filtering steps are replaced with fast wavelet transforms.