Face Localization

The human face is a highly correlated object due to the lack of variation in skin complexion. Even though facial features (i.e. mouths and eyes) differ in color from the skin tone, the hairless skin regions dominate facial surface area allowing it stand out against most backgrounds. Thus we expect a boundary around the face to be present. The foreshortening of the 3D face structure under most lighting conditions also accentuates the contour of the face. We propose that the face be considered as a blob or a region with a certain amount of contour enclosure. Furthermore, the scalp and the hair also usually triggers edge contours that extend the face blob. Consequently, we can expect both the face and head structures to behave as blobs or symmetric enclosures about a center point.