Evaluation of DWT and DCT for irregular mesh-based motion compensation in predictive video coding
Martina Eckert, Damián Ruiz, José I. Ronda, Fernando Jaureguizar, Narciso N. Garcia · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2000
While traditional video coding standards employ block-based processing (regarding motion estimation, motion compensation and DCT) which produce undesired artifacts, the most recent developments (H.263, MPEG) include first improvements in motion compensation (such as overlapped block motion compensation), which constitute a first step to avoid these limitations. Mesh-based motion compensation represents a further progress in this area as it treats the motion information in a continuous way over the whole frame. We investigated in these methods and have found that especially triangle meshes over irregularly spread node points lead to very good results. We presented first results of the compensation step, here we will show results of the complete coding scheme for rectangular frames. As the insertion of the transform/coding part raised the problem of which type of transformation should be employed to code the error image efficiently and without disturbing the gains of the compensation step, we here compare DCT and DWT (discrete wavelet transform) with different filter types, to find out which one is most useful to apply with mesh-based motion compensation.