1. A method of converting the frame rate of a video sequence, comprising: distributing multiscale coefficients obtained for each frame of an input video sequence into K groups of coefficients, K being a integer greater than 1, whereby a first group of coefficients provides a representation of the frame at a first resolution level and for each integer k such that 1<k≦K, a k th group of coefficients and the representation of the frame at the (k−1) th resolution level determine a representation of the frame at a k th resolution level; determining directions of regularity associated with pixels of at least one frame of an output video sequence based on representations of successive frames of the input video sequence at least one of the resolution levels; and determining an interpolated pixel value for each pixel of said frame of the output video sequence, the determination of the interpolated pixel value including, for each direction of regularity associated with said pixel, interpolating between pixel values from representations of successive frames of the input video sequence at least one of the resolution levels; wherein when considering a direction of regularity in at least one of the steps of determining directions of regularity and of determining interpolated pixel values, representations of the successive frames of the input video sequence are used at least one resolution level depending on said direction of regularity.