A NEW ADAPTIVE QUANTIZATION METHOD TO REDUCE BLOCKING EFFECT

In this paper, we present a method to reduce the blocking effects in b lack based coding schemes. Based on our observation, the blocking effe ct appears mainly in the regions where motion is fast or complex that its motion is not well compensated. But these regions tend to be coars ely quantized in the traditional method using only the spatial activit y measure [1]. In order to apply fine quantization on these regions, w e introduce a new activity measure, the slope activity. By using this measure together with the spatial activity measure, we can perform an adaptive quantization on each MB in a picture. Our approach shows bett er picture quality compared to the MPEG2 TM5. Particularly in East or complex motion scenes the blocking effect in the object boundaries are far more reduced than that of MPEG2 TM5, therefore generating much sm oother image for comfortable viewing. Also, our method shows higher PS NR. than that of the MPEG2 TM5.