Verfahren zur Gewinnung der Aussenlinie eines Objektes in einem Bild.

摘要

An image window (N) is intermittently moved along the contour (CT) of a subject image (I). At respective paused position of the image window, a spacial differential of the density level is calculated for each pixel in the image window. A differential histogram is produced from the respective differentials, and a threshold level (Eth) is determined from the differential histogram and a designated p-tile ratio. A contour image is then obtained by discriminating the respective differentials with the threshold level.