A Viewport-Adaptive Rate Control Approach for Omnidirectional Video Coding

For omnidirectional videos (ODVs), the existing off-line coding approaches are designed based on the spatial or perceptual distortion in a whole ODV frame, ignoring the fact that subjects can only access viewports. To improve the subjective quality inside the viewports, this paper proposes an off-line viewport-adaptive rate control (RC) approach for ODVs in high efficiency video coding (HEVC) fram...