Active mesh: a video representation scheme for feature seeking and tracking

Yao Wang; Ouseb Lee

doi:10.1117/12.157916

22 October 1993 Active mesh: a video representation scheme for feature seeking and tracking

Yao Wang, Ouseb Lee

Proceedings Volume 2094, Visual Communications and Image Processing '93; (1993) https://doi.org/10.1117/12.157916
Event: Visual Communications and Image Processing '93, 1993, Cambridge, MA, United States

Abstract

This paper introduces a representation scheme for images and video sequences using nonuniform samples embedded in a mesh structure. It describes a video sequence by the nodal positions and colors in a starting frame, followed by the nodal displacements in the following frames. The nodal points are more densely distributed in regions containing interesting features such as edges and corners, and are dynamically updated to follow the same features in successive frames. They are determined automatically by maximizing feature (e.g., gradient) magnitudes at nodal points, while minimizing interpolation errors within individual elements, and matching errors between corresponding elements. In order to avoid the mesh elements becoming overly deformed, a penalty term is also incorporated which measures the irregularity of the mesh structure. The notions of shape functions and master elements commonly used in the finite element method have been employed to simplify the numerical calculation of the energy functions and their gradients. The proposed representation is motivated by the active contour or snake model proposed by Kass, Witkin, and Terzopoulos. The current representation retains the salient merit of the original model as a feature tracker based on local and collective information, while facilitating more accurate image interpolation and prediction.

Citation Download Citation

Yao Wang and Ouseb Lee "Active mesh: a video representation scheme for feature seeking and tracking", Proc. SPIE 2094, Visual Communications and Image Processing '93, (22 October 1993); https://doi.org/10.1117/12.157916

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