Seamless Heterogeneous Tessellation via Smoothing and Mosaicking in the DWT Domain

摘要

In this paper we propose a strategy for seamless tessellation, of varying resolution tiles, based on smoothing and mosaicking in the DWT domain. The scenario involves a tessellation with three different tile qualities or levels of detail (LOD), at a given instant, depending on the viewpoint distance, the time of rendering and hardware resources. The LOD is dependent on the multiresolution characteristic of wavelets from the now widely accepted JPEG2000 codec. Taking the change in viewpoint focus, analogous to a window sliding approach, we believe that at worst the window may come up to be composed of three different tile qualities with the resultant artifacts at tile interfaces. To dilute these artifacts, we treat the tiles at the subband level, in the DWT domain, by employing operations involving suitable subband-sized composite masks, conceived with smoothing and mosaicking in perspective. The resultant composite subbands are subjected to a global inverse DWT to get the final seamless tessellation.