Efficient Rate Control Algorithm for 3-D Wavelet-Based Scalable Video Coding

Rate control technique is the typical application in rate-distortion optimization, also is an indispensable module in video coding systems, which makes the encoder output a specific bit rate to meet the requirements of channel bandwidth and storage space. 3-D wavelet-based scalable video coding provides a natural way in producing embedded bitstreams with full scalability and fine granularity for in-network adaptation. The
$\lambda$
domain rate control technique has been integrated into the latest 3-D wavelet-based SVC, due to its accurate bit estimation and high rate-distortion performance. However, it is found that the rate control algorithm is not the optimal choice within the open-loop motion compensated temporal filtering structure. In this paper, an efficient rate control algorithm is proposed in the context of rate distortion optimization for 3-D wavelet-based scalable video coding. First, different temporal subband content perception characteristics, subband weighting factors, and subband coupling phenomenon have been incorporated into our algorithm to select the Lagrange multiplier adaptively; Second, the proposed model is obtained to enhance the rate control performance. Finally, based on the proposed rate control model, the coding parameters are adaptively adjusted to realize the rate control objective. Experimental results show that the proposed rate control algorithm turns out to be much better than the reference methods in terms of the rate control accuracy, rate-distortion performance, and reconstructed video quality with negligible additional computational complexity. These research results of test and comparison above demonstrate that the proposed rate control algorithm is effective and feasible, and the corresponding model has an excellent performance.