抄録
In the present study, characteristics of facial features for a human shape are detected in order to extract a trademark having a human shape. After preprocessing to remove pure graphics that cannot constitute human-shaped trademarks, eyes are detected in an image. A specific eye, which is an aggregate of white pixels and detectable even when a contour line and the eye are joined, is detected. When the eye is connected with a contour line, the contour line is traced and the extreme value of changes in direction is determined, whereby the eye is separated from the contour line. Thereafter, by analyzing corresponding positions and shapes of the eyes, nose and mouth, facial features are detected and it is determined whether or not a face is present.
