Abstract: Infra macro block refreshing is an important error resilient approach for video transmission. The error resilient of wireless video transmission was analyzed and several infra macro block refresh methods were compared. After that, an improved macro block refresh approach was proposed. Based on the analysis of the mainly motion direction of the video, the approach chose different infra macro block refresh strategy to decrease the proportion of infra macro block in the frame and maintained the similar error resilient ability. hhe proposed approach was compared with number of intra macro block refresh methods for the same video frame loss pattern. The experimental results show that the new approach can refresh the decayed video quickly, at the same time increase the coding efficiency. The proposed approach has a good subject and object quality and compatible with all the current video coding standards.

Key words: Intra macro block refreshing, Error resilient, Error concealment, Wireless video transmission