Abstract: The invention relates to a method intended to provide or collect additional information concerning the content of a broadcast. For this purpose, it is necessary to design a process for synchronising between a reference audiovisual content and an altered television broadcast version thereof. The method comprises the steps of: creating a fingerprint of the broadcast content by means of the real-time extraction of features of the image which correspond to a series of frames; parcelling the image, that is dividing the screen corresponding to a frame of the broadcast into smaller pieces or parcels; extracting the colour histogram corresponding to each parcelled piece; searching for significant points of the image of each frame analysed; detecting the advertisement broadcast period; and comparing the fingerprint created for the broadcast content with the fingerprint created for the reference content, to achieve a degree of coincidence or certainty or correspondence below a threshold.