2. The method according to claim 1 further comprising, if the number of character photos are less than n, selecting people photos for the subset of photos until reach n.
2. The method according to claim 1 further comprising, if the number of character photos are less than n, selecting people photos for the subset of photos until reach n. 3. The method according to claim 2 further comprising, if the number of people photos are less than n, selecting non-people photos for the subset of photos according to their aesthetic measure until reach n.