SVC interlayer error concealment method based on OBMC

Abstract

The invention provides an SVC interlayer error concealment method based on OBMC. For a certain dropped frame, the method comprises the following steps at decoding end: according to space resolution rate of an enhancement layer and a base layer, judging whether the motion vector of the base layer needs to be amplified in scale and multiple and whether up-sampling filter is carried out to residual error data of the base layer; carrying out scale amplification and mode mapping to the motion vector of the base layer and obtaining the motion vector and mode of corresponding position of the enhancement layer; and using the motion vector and mode of the enhancement layer to carry out reconstruction to the dropped frame. The invention judges whether scale amplification is carried out according to the space resolution rate of the enhancement layer and the base layer before using the motion vector of the base layer, adopts possible up-sampling filter to residual error data of the base layer after a plurality of compensating blocks are found for OBMC weighing, adds the obtained data on the reconstructed value of an OBMC method, and avoids the block effect problem caused by using signal motion vector to make motion compensation.

Description

technical field [0001] The invention relates to the technical field of video coding, in particular to an error control method. Background technique [0002] In recent years, with the rapid growth of Internet-oriented and wireless video services, the goal of video coding has shifted from simply pursuing high compression rates to making video streams better adapt to various network environments and user terminals, and has a certain Fault tolerance and scalability. For this goal, the optimal solution is Scalable Video Coding (Scalable Video Coding, SVC). [0003] SVC can provide a single code stream from which sub-code streams can be extracted. The sub-stream can meet the transmission efficiency of the network and the requirements of end users for video in terms of space, time and signal-to-noise ratio. In SVC, the lowest quality layer is called the base layer, and the layer that enhances the spatial resolution, temporal resolution, or signal-to-noise ratio strength is calle...

AI Technical Summary

Problems solved by technology

[0006] The disadvantage of the existing BLSkip error concealment method is that the reconstruction of a block in the enhancement layer only uses the information of the corresponding position of the base layer, but because the spatial resolution and quantization parameter (Quantization Parameter, QP) of the base layer and the enhancement layer may be different, so There are differences in motion vectors and segmentation methods selected by the encoder. Using the BLSkip error concealment method will bring certain block effects

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