Abstract
This paper proposes a new region-oriented coding scheme of still images. The scheme first segments an image by using Voronoi diagrams. Then luminance components in each Voronoi region are encoded using an adaptive transform method. We utilize Schmidt's orthogonalizing method to produce basisfunctions for arbitrarily shaped regions. Since the property of basis-function depends on the order of input vectors in orthogonalization, we change the order adaptively to improve coding performance. Simulation results indicate that the proposd coding scheme achieves higher coding performance than the KLT-based scheme which we reported formerly, with much less computation.
