Coding and Communication

This group is closely connected with the Image coding Group in the Electrical Engineering Department at Linköping University, which started in 1972 when Robert Forchheimer began his Ph.D. thesis work on "Vectorial Delta Modulation for Picture Coding" under the supervision of Prof. Ingemar Ingemarsson. An early contribution was the suggestion of doing motion compensation in the spatial domain in a hybrid coding loop, as presented by Robert Forchheimer in 1981. In the beginning, the scheme was critisized for being too computationally expensive, since it requires an inverse transform in the coder, but has by now become an established technique. All modern video coding standars, such as H.261, H.263, H.26L, MPEG-1, MPEG-2, and MPEG-4, are based on this principle. A later major contribution was the introduction of 3D-model-based coding in 1983, now becoming an established technique through standardization (MPEG4-SNHC).