Efficient Low Bit-Rate Intra-Frame Coding using Common Information for 360-degree Video

Abstract

With the growth of video technologies, superresolution videos, including 360-degree immersive video has become a reality due to exciting applications such as augmented/virtual/mixed reality for better interaction and a wideangle user-view experience of a scene compared to traditional video with narrow-focused viewing angle. The new generation video contents are bandwidth-intensive in nature due to high resolution and demand high bit rate as well as low latency delivery requirements that pose challenges in solving the bottleneck of transmission and storage burdens. There is limited optimisation space in traditional video coding schemes for improving video coding efficiency in intra-frame due to the fixed size of processing block. This paper presents a new approach for improving intra-frame coding especially at low bit rate video transmission for 360-degree video for lossy mode of HEVC. Prior to using traditional HEVC intra-prediction, this approach exploits the global redundancy of entire frame by extracting common important information using multi-level discrete wavelet transformation. This paper demonstrates that the proposed method considering only low frequency information of a frame and encoding this can outperform the HEVC standard at low bit rates. The experimental results indicate that the proposed intra-frame coding strategy achieves an average of 54.07% BDrate reduction and 2.84 dB BD-PSNR gain for low bit rate scenario compared to the HEVC. It also achieves a significant improvement in encoding time reduction of about 66.84% on an average. Moreover, this finding also demonstrates that the existing HEVC block partitioning can be applied in the transform domain for better exploitation of information concentration as we applied HEVC on wavelet frequency domain.

Efficient High-Resolution Video Compression Scheme Using Background and Foreground Layers

“…• The effectiveness of cuboid coding on the Static information frame of a Sequence of original frames (S IF S OF ) has been studied to improve the overall coding gain as well as reduce time complexity. • A modified coarse frame generation scheme has been adopted where instead of replacing each cuboid by mean intensity values as adopted in [12], DCT is applied on each cuboid and visually most significant information is exploited by truncating high-frequency components.…”