The present invention relates to production of a video signal representing a sports scene involving a rapid ball movement in front of an essentially static background. A series of source images (IMG) of the scene is registered. An initial image position (p1) for the moving ball is identified automatically by, for each image (IMG) in said series, producing a difference image between the image (IMG) and an image subsequent thereto. In the difference image, all image elements representing a contents alteration below a threshold level are allocated a first value, and all image elements representing a contents alteration above or equal to the threshold level are allocated a second value. A set of ball candidates is then identified in which each candidate is represented by a group of neighboring image elements that all contain the second value. The group must also fulfil a ball size criterion. The initial image position (p1) is selected from the set of ball candidates based on a ball selection algorithm. Thereafter, the ball is tracked, and a composite image sequence is generated wherein a synthetic trace (ΠB) representing the path of the moving ball is shown as successively added image data (p1, p2, p3, p4).