Showing papers by "Frank Hartung published in 1998"
TL;DR: The proposed method is robust and of much lower complexity than a complete decoding process followed by watermarking in the pixel domain and re-encoding, and is also applicable to other hybrid transform coding schemes like MPEG-1, MPEG-4, H.263.
861 citations
TL;DR: Current watermarking schemes may be viewed as spread-spectrum communications systems, which transmit a message redundantly using a low-amplitude, pseudo-noise carrier signal.
90 citations
TL;DR: A model-based approach for the estimation of the facial parameters that combines a motion model of an explicit 3D textured wireframe with the optical flow constraint from the video data leads to a linear algorithm that is robustly solved in a hierarchical framework with low computational complexity.
80 citations
01 Sep 1998
TL;DR: An introduction to the principles of multiresolution coding of image and video signals is given and spatio-temporal pyramids are reviewed as the most promising approach to scalable video coding.
Abstract: Multiresolution image and video coding schemes offer both excellent coding efficiency and the ability to support scalability. This paper gives an introduction to the principles of multiresolution coding of image and video signals. Besides critically sampled subband pyramids, oversampled pyramid decompositions are discussed. Oversampled subband pyramids are often better suited for scalable coding schemes. Solutions to the bit allocation problem for subband coders with and without quantization noise feedback are presented. Finally, we briefly review spatio-temporal pyramids as the most promising approach to scalable video coding.
7 citations