Are you F. Moschetti?

Claim your profile

Publications (6)4.63 Total impact

  • F. Moschetti, K. Sugimoto, S. Kato, M. Etoh
    [Show abstract] [Hide abstract]
    ABSTRACT: In this paper we present a video coder based on a redundant dictionary that employs nonseparable bidimensional functions. The algorithm used for the representation of the residual of motion estimation is matching pursuit (MP). The proposed dictionary has new features capable of catching curved and oriented contours typical of the residual of motion estimation in natural video sequences. An adaptive grid approach is adopted for the coding of atoms and this is combined with an innovative coding method employing an arithmetic encoder. The proposed coder shows improvements over H.264 in terms of compression efficiency, with up to 20% gains for very low bitrates.
    Image Processing, 2004. ICIP '04. 2004 International Conference on; 11/2004
  • [Show abstract] [Hide abstract]
    ABSTRACT: Video coding schemes, equipped with various kinds of prediction modes, improve coding efficiency by offering efficient prediction modes that adapt to the motion in a macroblock (MB). Operation time for motion estimation and mode selection, on the other hand, increases with the number of prediction modes. We have proposed a motion compensated prediction method (arbitrary-shape partitioning motion compensation: APMC) equipped with various inter prediction modes which adapts to the motion boundary of objects on an MB basis. This paper confirms the coding efficiency of APMC in comparison to the final specification of H.264/AVC and introduces a method to improve the computational performance of APMC by using a hierarchical mode search method based on motion boundary position within MBs. Simulation results show that APMC improves coding efficiency by about 5% in comparison with the final specification of H.264/AVC, and the proposed hierarchical mode search method decreases the operation time to about 60%, while maintaining the coding efficiency.
    Image Processing, 2004. ICIP '04. 2004 International Conference on; 11/2004
  • F. Moschetti, K. Sugimoto, S. Kato, M. Burrini
    [Show abstract] [Hide abstract]
    ABSTRACT: Wavelets, fundamental components of the latest image coding standard JPEG2000, have proven to be a very useful tool in representation and coding of 2D images. They are also a powerful instrument in catching zero-dimensional singularities, though less efficient in dealing with 'edge' singularities. Ridgelets, by definition, are a powerful tool in catching and representing line singularities in bidimensional space. In this paper we propose a hybrid approach that combines both ridgelets and wavelets for a more efficient representation of 2D images with edges. Results confirm the potential of the combined use of wavelets and ridgelets as an efficient representation, showing substantial improvements when compared to only wavelets.
    Acoustics, Speech, and Signal Processing, 2004. Proceedings. (ICASSP '04). IEEE International Conference on; 06/2004
  • K. Sugimoto, F. Moschetti, S. Kato, M. Etoh
    [Show abstract] [Hide abstract]
    ABSTRACT: Matching pursuit (MP) based video coder represents an active alternative to conventional block based DCT based architectures R Neff et al. (1997). In this paper we propose a generalized motion compensation method and an entropy coding method for MP based coder. Motion vectors are combined with the cut-off frequency level of loop filters applied to the reference frame. Exploiting the characteristics of MP atoms, the latter are efficiently coded by employing an adaptive grid size combined with context based adaptive arithmetic coder. Reordering of atoms in each grid is also applied. Simulation results show that our proposed method outperforms traditional fixed grid based approach.
    Image Processing, 2003. ICIP 2003. Proceedings. 2003 International Conference on; 10/2003
  • Source
    L. Granai, F. Moschetti, P. Vandergheynst
    [Show abstract] [Hide abstract]
    ABSTRACT: Wavelet transform is a powerful instrument in catching zero-dimensional singularities. Ridgelets are powerful instrument in catching and representing mono-dimensional singularities in bidimensional space. In this paper we propose a hybrid video coder scheme using ridgelet transform for the first approximation of line-edge singularities in displaced frame difference images. We demonstrate the potential of ridgelets and results show substantial improvements when compared to wavelet only based coder.
    Multimedia and Expo, 2003. ICME '03. Proceedings. 2003 International Conference on; 08/2003
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Matching pursuit decomposes a signal into a linear expansion of functions selected from a redundant dictionary, isolating the signal structures that are coherent with respect to a given dictionary. In this paper we focus on the Matching Pursuit representation of the displaced frame difference (dfd). In particular, we introduce a new dictionary for matching pursuit that efficiently exploits the signal structures of the dfd. We also propose a fast strategy to find the atoms exploiting the maximum of the absolute value of the error in the motion predicted image and the convergence of the MSE with the rotation of the atoms. Results show that the fast strategy is quite robust when compared to exhaustive search techniques and it improves the results of a suboptimal search strategy based on a genetic algorithm.
    Image Processing. 2002. Proceedings. 2002 International Conference on; 02/2002