Whole-frame Error concealment with improved backward motion estimation for H.264 decoders

H.264 video compression standard is widely used in video transmission for telecommunications field, with a higher compression ratio and excellent network adaptability. But it also decreases the performance in anti-interference capabilities. More than one frame pictures of encoding data is stored in a data packet, once the data packet occur errors in transmission, the whole frame image is completely lost, and the next several frames can not be decoded well . Therefore, we must take the decoder error conceal technology to improve the ability of error resilient. This paper presents an error conceal method for whole-frame loss by using improved backward motion estimation. More precise quarter-pixel motion estimation to conceal the un-mapped pixel from previous correct decoded frame to current damaged frame is used to improve the quality of reconstructed frame, and spatial conceal method of distance-weighted average method is used to reduce the blocking-effect. Experiment results show it is effective.