Video signal analysis

Abstract

A video signal is analysed by deriving for each frame a plurality of parameters, said parameters including (a) at least one parameter that is a function of the difference between picture elements of that frame and correspondingly positioned picture elements of a reference frame; (b) at least one parameter that is a function of the difference between picture elements of that frame and correspondingly positioned picture elements of a previous frame; and (c) at least one parameter that is a function of the difference between estimated velocities of picture elements of that frame and the estimated velocities of the correspondingly positioned elements of an earlier frame. Based on these parameters, each frame is assigned one or more of a plurality of predetermined classifications. Scene changes may then be identified as points at which changes occur in these classification assignments.

Dependencies are inferred from the claim text.