一种无参考图像的块效应检测算法

Video coding methods based on the block will bring about blocking artifacts in reconstructed picture when applied in low bit rate environment. The artifacts may lead to the decline of visual image quality, so it is necessary for the blocky images to de-block. The paper proposes a new no-reference blockiness detection algorithm. The algorithm uses three constraints to distinguish block boundaries from real edges and textures, so as to detect more accurately the existence of blockiness, the positions of block boundaries and the extent of blockiness. The blockiness evaluation result can be used to tune the strength of the de-blocking filter which is adaptive at the frame level. The experimental results prove the effectiveness of the algorithm. The technique can meet the need of real time process for its simpleness.