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A Gimp plugin that implements the Octave Sharpening method
Octave sharpening is a plugin for The Gimp that implements a method which produces intense sharpened images without halos or noise.
If a High Pass Filter is not enough, try this.
Implementation of a Silhouette extraction algorithm [1]. Coded in octave (matlab).
[1] M. Yamada, K. Ebihara, and J. Ohya. A New Robust Real-time Method for Extracting Human Silhouettes from Color Images. Int. Conf. on Auto. Face and Gesture Recog., 1998