title: A wavelet-frame based image force model for active contouring algorithms.
abstract: This paper proposes a directional image force (DIF) for active contouring. DIF is the inner product of the zero crossing strength (ZCS) of wavelet frame coefficients, and the normal of a snake, by representing strength and orientation of edges at multiple resolution levels. DIF markedly improves the immunity of snakes to noise and convexity.
authors.forename: H H
authors.initials: HH
authors.lastname: Wu
authors.forename: J C
authors.initials: JC
authors.lastname: Liu
authors.forename: C
authors.initials: C
authors.lastname: Chui