1. A method for determining if two video signals match, the method comprising: extracting features from a first video signal to provide a first feature-extracted signal; extracting features from a second video signal to provide a second feature-extracted signal; cross-correlating the first and second feature-extracted signals to provide a cross-correlation score at each of a plurality of time lags; and determining a similarity score between the first and second feature-extracted signals based on the cross-correlation scores.