Omnidirectional video coding using latitude adaptive down-sampling and pixel rearrangement

Projection of omnidirectional videos in the spherical domain onto the planar domain is required to utilise existing video compression techniques. Due to its simplicity, the equirectangular projection (ERP) method has been widely adopted for sphere-to-plane mapping. However, the coding efficiency of the ERP method is inefficient because the ERP video includes visual redundancies in the high latitude areas of the sphere. To solve this problem, this Letter presents an efficient data compression scheme that employs latitude adaptive down-sampling followed by pixel rearrangement. Experimental results show that the proposed method can achieve a bitrate reduction of up to 28.9%, as compared with the ERP.

[1]  Bernd Girod,et al.  A Framework to Evaluate Omnidirectional Video Coding Schemes , 2015, 2015 IEEE International Symposium on Mixed and Augmented Reality.

[2]  Shing-Chow Chan,et al.  Data compression and transmission aspects of panoramic videos , 2005 .

[3]  Krista A. Ehinger,et al.  Recognizing scene viewpoint using panoramic place representation , 2012, 2012 IEEE Conference on Computer Vision and Pattern Recognition.

[4]  Bernd Girod,et al.  Content Adaptive Representations of Omnidirectional Videos for Cinematic Virtual Reality , 2015, ImmersiveME@ACM Multimedia.

[5]  Jisheng Li,et al.  Novel tile segmentation scheme for omnidirectional video , 2016, 2016 IEEE International Conference on Image Processing (ICIP).