本文介绍一种改善矢量量化图象编码恢复图象“方块效应”的方法——自适应中值滤波法。它是利用中值滤波能平滑尖锐噪声的特点,把“方块效应”视为噪声,对恢复图象有选择地进行一次中值滤波。即对“边缘”区域保持原值不变,非“边缘”区域利用3×3正方形窗进行一次中值滤波。实验结果表明,这种方法将为改善“方块效应”开辟一条新途径。 In this paper, we introduce an adaptive median filtering method to improve the “square effect” of the vector quantization image coding. It is the use of median filtering can be sharp and sharp noise characteristics, the “box effect” as a noise, the restoration of the image selective median filter. That is, the original value is kept unchanged in the “edge” region, and the median filter is performed in the “edgeless” region by 3 × 3 square windows. The experimental results show that this method will open up a new way to improve the “square effect.”