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- W39477326 abstract "The objective of this thesis is to propose real time solutions in order to reduce the video compression impairments namely the blocking, the ringing and the temporal flickering. The proposed deblocking filter is mainly based on an adaptive conditional two-dimensional filter, derived from the combination in horizontal and vertical directions of a simple two-mode conditional 1-d filter. Appropriate filters are selected using the local degradation of the image, which is assessed by examining he quantization step as well as the computed spatial pixel activities. The ringing artifact reduction algorithm uses a simple classification method to differentiate at and edge blocks, which are then filtered using a particular weighted median filter. Regarding the temporal impairments, we proposed a new measure to assess the level of these impairments and accordingly estimate the temporal quality of the decoded sequences. The preliminary study of the temporal compression artifacts demonstrated that the level of the temporal fluctuation between consecutive frames is affected by the compression ratio and the group of pictures structure, notably the presence (and period) of intra coded frames in the video sequence. It was also shown that the deringing process reduces the visibility of the mosquito noise, however a temporal filtering remains necessary to reduce the background areas fluctuation. For this reason, we proposed to temporally filter these areas and skip the temporal filtering of moving objects. Finally, the implementation complexity of the proposed solutions was investigated in order to prove the applicability of these solutions for real time applications." @default.
- W39477326 created "2016-06-24" @default.
- W39477326 creator A5043994921 @default.
- W39477326 date "2010-01-01" @default.
- W39477326 modified "2023-09-23" @default.
- W39477326 title "Méthodes à compléxite réduite pour amélioration de la qualité des séquences vidéo codées par blocks" @default.
- W39477326 hasPublicationYear "2010" @default.
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