Abstract
With the ripe development of video compression technique, popularity of the video communication had been brought up. However, the packet loss and the bit error occurred in the communication media is inevitable. Once the video data transmitted over an error-prone channel, it is possible for receiver to retrieve a corrupted video sequence. The coding standards such as H.264/AVC and MPEG4 which have a high compression rate made it possible to transmit video data and even real-time video payload over network .But the influence of error propagation in the time domain and the sequential data loss in spatial domain is also caused as the side effect of this high compression rate. The essence of fault-tolerant in video data made it different from file transmission. A small amount of transmission error is tolerable. However, the compression process aggravates the influence of transmission error. In order to improve the image quality that caused by transmission errors, It is efficient to take use of Error control or error concealment techniques. By using the spatial relativity remained after compression, it is feasible for the decoder to accomplish this job alone without consuming any extra network bandwidth. The discussion in this text is mainly focuses on error concealment. In the various error concealment algorithms for block-based coding, there is still some works that can be improved for concealment of blocks crossed by multiple edges. We will propose an efficient method for reconstructing multi-edge cases in this paper. By manipulating each edge unit separately, deriving the angle of the gradient for each unit by a similar procedure of directional interpolation, forming the best connection pattern with proper judging criterion, and filling the rest of the region by bilinear interpolation, we reconstruct the broken blocks. Besides, the estimation of the best error concealment algorithm which will be processed in the decoder will be done, in the encoder side. Then we embed the estimated result into the image by data hiding techniques. Once the error appeared during the transmission, the decoder can efficiently conceal the loss by the information embedded by the encoder without incurring extra network payload.