engleski

Influence of Downsampling Filters Characteristics on Compression Performance in Scalable Video Coding

The application of different downsampling filters in video coding directly models visual information at lower resolutions and influences the compression performance of a chosen coding system. In wavelet based scalable video coding the spatial scalability is achieved by the application of wavelets as downsampling filters. However, characteristics of different wavelets influence the performance at targeting spatio-temporal decoding points. In this paper an analysis of different downsampling filter in popular wavelet-based scalable video coding schemes is presented. Evaluation is performed for both intra and inter coding schemes using wavelets and standard downsampling strategies. Based on the obtained results a new concept of inter-resolution prediction is proposed which maximises the performance at all decoding points using combination of standard downsampling filters and wavelet-based coding.

scalable wavelet-based video coding; spatial scalability; downsampling filters

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