Research Of Reference Picture Selection And Related Technology

Video coding is a technique of representing video information with as little as possible bits to guarantee reconstructed picture quality. However, the compressed video is sensitive to the network error due to the predicted coding. When the inter frame coding is used in an error prone network, problem arise not only of greater degradation of the erred picture quality due to the errors but also of temporal and spatial propagation of the effects of the errors. The truth of video error control techniques is to make the hurt of transmission errors least whenever and wherever the transmission errors happened. Interactive video error control technique is proposed to remove transmission errors by transmitter and receiver's working together. Reference picture selection restrict the encoder the correctly decoded picture as the reference picture according to the backward channel signaling to prevent the temporal error propagation.The thesis is mainly concerned about:( 1 ) Rate control plays a very important role in constant bit rate(CBR) coding. In this paper, rate control module is introduced in the H.26L video coding standard based on the idea of rate control about video coding to smooth output of encoding data stream.(2) The reference picture selection system has two modes, one is ACK mode and the NACK mode. We explain both modes and focus on the mode switching mechanism according to the error condition on the network so that the optimal performance can be achieved in any error conditions. We show the performance of several modes and their application condition, finally the influence to the size of memory for reference pictures is analyzed.( 3 ) Error tracking allows the encoder to estimate interframe error propagation accurately, we combine error tracking and reference picture selection to accurately restrict correct reference area to improve encoding efficiency and the performance of error concealment.(4) Realize above arithmetic based new video coding standard H.26L. Simulative experimental results show that reference picture selection prevent effectively the error propagation and improve video quality.