Image Compression with Anisotropic Geodesic Triangulations
Bougleux, Sébastien; Peyré, Gabriel; Cohen, Laurent D. (2009), Image Compression with Anisotropic Geodesic Triangulations, 12th IEEE International Conference on Computer Vision (ICCV 2009), IEEE : Piscataway, NJ. 10.1109/ICCV.2009.5459425
TypeCommunication / Conférence
External document linkhttps://hal.archives-ouvertes.fr/hal-00366933
Book title12th IEEE International Conference on Computer Vision (ICCV 2009)
MetadataShow full item record
Abstract (EN)We propose a new image compression method based on geodesic Delaunay triangulations. Triangulations are generated by a progressive geodesic meshing algorithm which exploits the anisotropy of images through a farthest point sampling strategy. This seeding is performed according to anisotropic geodesic distances which force the anisotropic Delaunay triangles to follow the geometry of the image. Geodesic computations are performed using a Riemannian Fast Marching, which recursively updates the geodesic distance to the seed points. A linear spline approximation on this triangulation allows to approximate faithfully sharp edges and directional features in images. The compression is achieved by coding both the coefficients of the spline approximation and the deviation of the geodesic triangulation from an Euclidean Delaunay triangulation. Numerical results show that taking into account the anisotropy improves the approximation by isotropic triangulations of complex images. The resulting geodesic encoder competes well with wavelet-based encoder such as JPEG-2000 on geometric images.
Subjects / Keywordsgeodesic; Image compression; farthest point; Fast Marching; anisotropy; triangulation
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