| 摘要 |
In a space having image parameter values, a contour (10) is defined consisting of vertices (11, 12, 13) connected by edges (14, 15, 16). By variation of the position and number of the vertices as a function of the variation of image parameter values in the space, the contour (10) is determined to follow features in the density variation. The movement of vertices is restricted to a direction (+E,cir P+EE i) perpendicular to the local direction (+E,cir t+EE i) of the contour (10). For smoothing the contour (10), an internal force or energy is defined at each of the vertices (11, 12, 13) which force or energy depends on the angle (ci) between the edges at the vertex, or of the variation of the angles along a sequence of adjacent vertices. A direct interaction between vertices is thereby avoided.
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