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In this paper, we consider frame expansions derived from biorthogonal wavelet bases for building multiple descriptions with low redundancy constraints. Such constraints rise the problem of perfect reconstruction of the associated decompositions in the absence of quantization or channel errors, which requires special attention and therefore will be detailed in this work. We will show that several schemes...
Concerning the reconstruction quality, phase-shifting scheme has been proved to be efficient for digital holography. As a benefit from three differently phased reference waves, the reconstructed object image does no longer suffer from the zero-order image or twin image. In order to reduce the obvious storage and transmission burden brought in by extra holograms, in this paper, vector quantization...
Quality of experience in future home devices is foreseen to drastically increase, with the increase in image resolution. Displays with a horizontal resolution of 4K pixels are already appearing, and 8K Super-HiVision has already been demonstrated. Currently, only spatial upsampling of conventional HD format is performed to match the resolution of such displays. In this paper, we propose a novel method...
This paper propose the use of lapped transforms in a predictive video coding scheme. Our approach involves an inter-frame, block-based prediction based on lapped transforms and allows rate-distortion optimization, different block sizes and integration with intra-frame prediction. Moreover, this coding scheme strongly reduces the blocking artifacts associated to block-based transforms and permits a...
In this paper we propose the use of intra-frame prediction with lapped transforms for image coding. Both lapped transforms and intra prediction exploit the redundancies of neighboring blocks and the combination of the two techniques results in a very efficient image coding scheme. The difficulty to combine them comes from the necessity to use for the prediction of the current block pixels in the causal...
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