AVS帧内预测模式改进

Improved intra prediction mode for AVS

目前视频编码标准帧内预测主要利用邻近的左侧块,上侧块和右上侧块的像素,未采用右侧块和下侧块像素,并不是因为右侧块和下侧块和当前块相关性不强,而是因为在解码端,右侧块和下侧块需要参考当前块数据才能解码显示。针对右侧块帧内预测模式为垂直模式,可以采用右侧块对当前块预测,提出一种新的预测模式左右均值模式。以AVS为例,对编码端和解码端做出相应修改。实验结果表明,在编解码复杂度增加很少的情况下,编码信噪比增加约0.02dB,编码码率降低约1.22%。

The method of Intra prediction for the current video coding standard mainly uses the pixels of the left,the top,the upper right neighboring blocks,and doesn’t use the pixels of the right and lower blocks.It is not because there is low correlation between the current block and the right and lower blocks,but the right and lower blocks need to refer to the data of current block to decode the display.If the mode of the right block is the vertical mode,it can use the data of right block to predict the current block and a new prediction model of mean-left-right is presented.The corresponding adjustment is implemented for AVS encoder and decoder.Experimental results show that the PSNR increases about 0.02 dB and the coding bit rate decreases by about 1.22% with small complexity increasing.