A low-complexity and efficient encoder rate control solution for distributed residual video coding.
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HU, C., HU, B., TU, W. and XIONG, Y. 2018. A low-complexity and efficient encoder rate control solution for distributed residual video coding. Multimedia tools and applications [online], 77(5), pages 5713-5735. Available from: https://doi.org/10.1007/s11042-017-4484-5
Existing encoder rate control (ERC) solutions have two technical limitations that prevent them from being widely used in real-world applications. One is that encoder side infor- mation (ESI) is required to be generated which increases the complexity at the encoder. The other is that rate estimation is at the bit plane level which brings computation load and latency when there are many bit planes. To maintain a low-complexity encoder, we propose an ERC solution that combines an eff i cient encoder block mode decision (EBMD) for the distributed residual video coding (DRVC). The main contributions of this paper are as follows: 1) ESI is not required as our ERC is based on the analysis of the statistical characteristics of decoder SI (DSI) in DRVC; 2) a simple EBMD is introduced which only employs the value of the residual pixels at the encoder to classify blocks into Intra mode, Skip mode, and WZ mode; 3) an ERC solution using pseudo-random code scrambling is proposed to estimate the rate for all the WZ blocks at the frame level instead of the bit plane level, i.e., only one rate is estimated; and 4) a quantization-index estimation algorithm (QIEA) is introduced to solve the problem of rate underestimation. Our simulation results show that the proposed solution is not only low complex but also eff i cient in both the block mode decision and the rate estimation. Also, as compared to the DISCOVER system and the state-of-the-art ERC solutions, our solution has competitive rate distortion performance. Due to the simple framework and the low-complexity encoder, our solution is promising in practice.