An error control mechanism based on adaptive intra-frame refreshment

Previous error control methods have obvious defects more or less for the videoconference applications. A simple and efficient error control mechanism based on adaptive intra-frame refreshment, in this paper, is proposed to conceal the transmission errors of real time video. This scheme maintains a backward channel to feedback the error information found by the decoder so that the coder is able to adjust the interval of intra-frame coding dynamically to conceal all sorts of real time video transmission errors. Simulation results present that this method can efficiently eliminate the temporal and spatial error propagation. Compared to conventional schemes, our algorithm need not modify the coder and decoder (Codec) and no more CPU time is consumed as well. As a result, this algorithm is especially fit for the videoconference or visual telephone applications.