Abstract
Slow motion replay and spatial zooming are special effects used in digital video rendering. At present, most techniques to perform digital spatial zoom and slow motion are based on interpolation for both enlarging the size of the original pictures and generating additional intermediate frames. Mainly, interpolation is done either by linear or cubic spline functions or by motion estimation/compensation which both can be applied pixel by pixel, or by partitioning frames into blocks. Purpose of this paper is to present an alternative technique combining fractals theory and wavelet decomposition to achieve spatial zoom and slow motion replay of HD digital color video sequences. Fast scene change detection, active scene detection, wavelet subband analysis, and color fractal coding based on Earth Mover's Distance (EMD) measure are used to reduce computational load and to improve visual quality. Experiments show that the proposed scheme achieves better results in terms of overall visual quality compared to the state-of-the-art techniques.
Highlights
Today’s TV broadcasting industry is rapidly facing new challenges to chase the technological progress if compared to the previous fifty years of its existence
The DVB family of standards has recently extended its arena with the release, alongside traditional DVB-S, DVB-T, and DVB-C, of the new DVB-H and DVB-SH to cope with mobile applications for handheld terminals, while several new means to service delivering are arising beside traditional terrestrial and satellite systems, such as TV video streaming over IP (IPTV) based either on XDSL or in the forthcoming near future on WiMAX access
In this work we have presented an alternative technique combining fractals theory and wavelet decomposition to achieve spatial zoom and slow motion replay of HD digital color video sequences, which can be integrated on the decoder set-top boxes irrespective of the specific broadcasting technology
Summary
Today’s TV broadcasting industry is rapidly facing new challenges to chase the technological progress if compared to the previous fifty years of its existence. Motion compensated frame interpolation (MCFI) techniques were proposed to improve performance in case of slow motion These techniques were formerly used to convert frame rate between PAL, NTSC, and HDTV, MCFI methods are used in video streaming and conferencing applications [3,4,5]. In [7], the joint use of fractal coding and wavelet subband analysis to obtain spatial zoom and slow motion replay of luminance video sequences is proposed to avoid the above mentioned distortion effects. In this paper we will propose a novel approach for coding color images based on the joint use of the L∗a∗b∗ color space and Earth Mover’s Distance (EMD) measure [16].
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