the resulting videos howeverwe can now "signaturethe normalized video trivial signature would be to assign or to each frame based on whether it has more or less brightness than average more sophisticated signature would be bit measure of the redgreenand blue intensities for each frame even more sophisticated signatures can be developede by taking into account the regions on individual frames the motivation for better signatures is to reduce the number of false matches returned by the systemand thereby reduce the amount of time needed to review the matches the solution proposed above is algorithmic howeverthere are alternative approaches that could be effectiveletting users flag videos that infringe copyright (and possibly rewarding them for their effort)checking for videos that are identical to videos that have previously been identified as infringinglooking at meta-information in the video headeretc variantdesign an online music identification service