The tricky part is that those signals, those changes that we're after, are extremely subtle, so we have to be very careful when you try to separate them from noise that always exists in videos.
Pjesa e veshtire eshte se ato sinjale, ato ndryshime qe ne kerkojme,  jane jashtemase te vogla, keshtu qe duhet te tregohemi shume  te kujdesshem kur mundohemi t'i ndajme nga zhurma qe ekziston  gjithmone neper video.