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Summary: 1270 IEEE TRANSACTIONS ON IMAGE PROCESSING, VOL. 6, NO. 9, SEPTEMBER 1997
Occlusion-Adaptive, Content-Based
Mesh Design and Forward Tracking
Yucel Altunbasak and A. Murat Tekalp, Senior Member, IEEE
Abstract--Two-dimensional (2-D) mesh-based motion compen-
sation preserves neighboring relations (through connectivity of
the mesh) as well as allowing warping transformations between
pairs of frames; thus, it effectively eliminates blocking artifacts
that are common in motion compensation by block matching.
However, available 2-D mesh models, whether uniform or nonuni-
form, enforce connectivity everywhere within a frame, which is
clearly not suitable across occlusion boundaries. To this effect,
we hereby propose an occlusion-adaptive forward-tracking mesh
model, where connectivity of the mesh elements (patches) across
covered and uncovered region boundaries are broken. This is
achieved by allowing no node points within the background
to be covered (BTBC) and refining the mesh structure within
the model failure (MF) region(s) at each frame. The proposed
content-based mesh structure enables better rendition of the
motion (compared to a uniform or a hierarchical mesh), while
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