Unidirectional Encoder Rate Control Scheme for Transform Domain Distributed Video Coding

Abstract

This paper proposes a unidirectional encoder rate control (ERC) scheme in the interpolation based distributed video coding. As the encoder is complexity constrained, accurate estimation of number of bits to decode each bit plane is indeed difficult at the encoder. In case of under-estimation of the bits, correction of the errors in the decoded bit planes, by utilizing the available information, is one of the important tasks at the decoder. This was addressed by recent schemes. In this paper, we present an improved ERC, considering higher group of pictures(GOP). The contributions of the proposed scheme are (1) adaptive rate estimation, considering the dependency across Wyner-Ziv frames (2) motion adaptive reconstruction and (3) Side information refinement after decoding all the frames in the GOP. The proposed scheme is tested with several sequences, showing improvements in the case of GOP-4.