Contour coding can be applied with profit both to visual communication at very low data rates and to contour-texture techniques, as recent neurophysiological findings strongly suggest. The present paper aims at reducing the coding cost by removing the interframe redundancy. First therefore several intra-frame contour coding algorithms are investigated and attempts to single out those suitable for interframe extrapolation are made. The parameter encoding turned out to be the most appropriate. In fact it does not resort to a pel-by-pel descri'ption; on the contrary it resorts to a global description of the contour, which presents more moderate frame to frame changes. Then an interframe method is presented. It con-sists in a preliminary verification to see if the movement of a single contour is rigid, without any deformation, or not. In the first case the displacement is measured and transmitted; in the second case the changes experienced by the parameters chacterizing the contour are estimatet, coded and transmitted. The performance of this coder, tested by a typical videotelephonic sequence, is shown, and comments are made and a feasible strategy for further improvements is outlined.