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Jiwen Lu of Nanyang Technological University in Singapore and his colleagues trained a piece of software to determine whether or not a pair of photos shows a parent and child. To do this, the team used a database of public figures and their parents or children - such as French president Nicolas Sarkozy and his son Jean - and fed the program 320 pairs each of parent-child matches and mismatches. The program analyses pictures one pixel at a time and looks for trends in the surrounding pixels.
