Fig. 1. Framework of 360 ° panoramic video coding based on ROI

Fig. 2. 360° image sequences. (a) Building sequence for camera fixed; (b) glacier sequence for camera not fixed; (c) jump sequence for camera fixed; (d) ballooning sequence for camera not fixed

Fig. 3. Extracting results of ROI. (a) Building sequence; (b) glacier sequence

Fig. 4. Distribution of QP offset for image with resolution of 3840 pixel×1920 pixel

Fig. 5. BD-rate performance of glacier and building sequences. (a) Glacier sequence; (b) building sequence

Fig. 6. Local enlarged drawing of ROI and original 8th frame of glacier sequence. (a) Original frame; (b) enlarged drawing of local viewport; (c) reconstructed frame using HM15.0; (d) reconstructed frame using proposed method