Since the traditional H 261/3 and MPEG 1/2 standards employ the block based compression algorithm,decoded images are suffered from severely blocky artifacts and mosquito effects at low bit rate.

• 在传统的H.；261/3以及MPEG-1/2标准中是采用基于块的压缩算法；可在低比特率运用时；会出现严重的块状效应及蚊式噪声。