Because of buffer overflow or delay timeout

packet loss is very common in current internet data transmission. The situation is even worse for real time internet video communications. Due to the prediction property of most state of the art video coding methods

data loss in a single frame can also deteriorate several successive frames. Intra update is well known as an effective method to reduce this error propagation. In this paper

we propose a novel adaptive intra update method. Taking decoder error concealment into account

the distortion at the decoder can be precisely estimated at the encoder by using the Recursive Optimal Per-pixel Estimate (ROPE). Then

image regions with maximum distortion are intra updated. Thus the damaged image regions at the decoder can be recovered in time. Simulation results demonstrate that our method achieves substantial and consistent gains in PSNR(0. 3~2. 5dB) over the non-adaptive methods such as raster-order intra update and random intra update for different video coding rates and packet loss rates. The complexity of this method is also modest

and it can be easily incorporated into current video communication system while maintaining compatibility.