Method of encoding and decoding an image sequence by means of hierarchical temporal analysis
A time analysis and image technology, applied in image communication, television, electrical components, etc., can solve the problems of image damage, damage to the overall quality of the reconstructed image sequence, etc., and achieve the effect of image quality distribution improvement
Active Publication Date: 2010-10-27
INTERDIGITAL CE PATENT HLDG
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However, the dynamics of the image then have to be adapted to the dynamics of the image obtained by MCTF filtering, which incurs an additional encoding cost
This damages images encoded according to the MCTF mode and thus the overall quality of the reconstructed image sequence
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[0035] figure 2 The motion compensation temporal filtering operation performed by the temporal analysis circuit 4 for the 4-stage decomposition of the GOP including 16 images indicated by bold lines in this example is schematically shown.
[0036]The filtering mode used is called "lifting". In this example, filtering will be performed on a set of 16 images using a longer length linear filter instead of complex filtering in wavelet coding, it is known that the filtering method consists of using a finite length filter for the filter A factorise is performed, for example, if it is decided to filter samples every two, then two finite length filters are used, and for each factorization level, the filtering operation is updated. Therefore, consider the case where a filtering operation along the direction of motion is performed on pairs of images. In the first temporal decomposition stage, the low-frequency and high-frequency filtering operations on each GOP pair generate 8 low te...
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The invention relates to a method of encoding and decoding an image sequence by means of hierarchical temporal analysis. According to the invention, movement-compensated temporal filtering (MCTF) is performed, the temporal filtering being replaced by intra mode encoding in order to obtain at least one low (L)- or high (H)-frequency image if the current image has a level of correlation with a preceding image that is below a threshold. The low (L)-frequency images obtained are subsequently adjusted to scale in order to be adapted in terms of energy to the images obtained by movement-compensatedtemporal filtering. The invention is characterised in that, at the end of the analysis, it comprises the following steps: selection of the images obtained by intra encoding of an image of the lower decomposition level with the additional condition, for the high-frequency images, said image originating from intra encoding; and calibration of the selected image, involving at least one step that is the reverse of the scale adjustment step. The invention also relates to the applications thereof in relation to video compression with temporal prediction.
Description
technical field [0001] The invention relates to a video coding and decoding method of a sequence of images, which is coded by hierarchical temporal analysis using motion compensated temporal filtering. [0002] This scope relates to video compression based on spatial and / or temporal scalability graphs called "scalables". For example, this involves 2D+t wavelet coding including motion compensated temporal filtering. Background technique [0003] In hybrid coding standards such as MPEG-1, MPEG-2, MPEG-4 and h264, as in most 2D+t subband coding schemes such as MC-EZBC (an acronym for Motion Compensated Embedded Zero Block Context) As in , the first step of the coding system consists of exploiting the temporal redundancy between consecutive images before exploiting the spatial redundancy within the images. [0004] figure 1 A diagram of a video encoder according to the prior art is shown. [0005] The video signal is transmitted to the time analysis circuit 1. A motion esti...
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IPC IPC(8): H04N7/26
CPCH04N19/00781H04N19/00121H04N19/00787H04N19/00818H04N19/00333H04N7/2659H04N19/0009H04N19/0003H04N19/00842H04N19/13H04N19/647H04N19/63H04N19/61H04N19/107H04N19/124H04N19/1883H04N19/615
Inventor 爱德华·弗朗索瓦纪尧姆·布瓦松热罗姆·维耶龙菲利普·罗伯特格温埃莱·马康
Owner INTERDIGITAL CE PATENT HLDG