基于感兴趣区域的360°全景视频编码 
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360° Panoramic Video Coding Based on Region of Interest
1 宁波大学信息科学与工程学院, 浙江 宁波 315211
2 南京大学计算机软件新技术国家重点实验室, 江苏 南京 210093
图 & 表
图 1. 基于ROI的360°全景视频编码框架
Fig. 1. Framework of 360 ° panoramic video coding based on ROI
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图 2. 360°全景图展示[18]。(a) Building序列(相机固定);(b) glacier序列(相机可移动);(c) jump序列(相机固定);(d) balloning序列(相机可移动)
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
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图 3. ROI提取效果。(a) Building序列;(b) glacier序列
Fig. 3. Extracting results of ROI. (a) Building sequence; (b) glacier sequence
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图 4. 分辨率为3840 pixel×1920 pixel的图像QP偏移值
Fig. 4. Distribution of QP offset for image with resolution of 3840 pixel×1920 pixel
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图 5. 部分序列率失真性能。(a) Glacier序列;(b) building序列
Fig. 5. BD-rate performance of glacier and building sequences. (a) Glacier sequence; (b) building sequence
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图 6. Glacier序列第8帧原始图及ROI局部放大图。(a)原始视频;(b)局部视口放大图;(c) HM15.0重建帧;(d)本文算法重建帧
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
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表 1全景视频序列信息[18]
Table1. Panoramic video sequence information
| Sequence | Sequencename | Resolution /(pixel×pixel) | Framerate | Bit-deep | Does thecamera move? |
|---|
| Building | timelapse_building_vr_25p_3840×1920.yuv | 3840×1920 | 25 | 8 | No | | Jump | timelapse_basejump_vr_25p_3840×1920.yuv | 3840×1920 | 25 | 8 | No | | Glacier | glacier_vr_24p_3840×1920.yuv | 3840×1920 | 24 | 8 | Yes | | Balloning | ballooning_vr_25p_3840×2160.yuv | 3840×2160 | 25 | 8 | Yes |
|
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表 2本文方法和原始HM15.0平台的对比结果
Table2. Comparison results of proposed method and original HM15.0
| Sequence | PSNR | WS-PSNR | S-PSNR |
|---|
| BD-PSNR /dB | BD-rate /% | BD-WS-PSNR /dB | BD-rate /% | BD-S-PSNR /dB | BD-rate /% |
|---|
| Building | -0.1788 | 4.0026 | 0.0735 | -1.5160 | 0.0648 | -1.2634 | | Glacier | 0.1044 | -1.6704 | 0.3222 | -4.9822 | 0.3388 | -4.9103 | | Jump | -0.2040 | 5.3328 | 0.0875 | -2.1715 | 0.0807 | -1.8890 | | Ballooning | -0.3383 | 5.3488 | 0.0993 | -1.5317 | 0.0947 | -1.3998 | | Average | -0.1542 | 3.2534 | 0.1456 | -2.5504 | 0.1448 | -2.3656 |
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表 3本文方法和文献[
20]方法的对比结果
Table3. Comparison results of proposed method and Ref. [20]%
| Sequence | WS-PSNR | S-PSNR | SSIM |
|---|
| BD-rate | BD-rate | BD-rate |
|---|
| Building | -0.1760 | -0.3264 | -5.5388 | | Glacier | -0.4900 | -0.5380 | -6.4314 | | Jump | -0.6295 | -0.6870 | -1.1770 | | Balloning | -0.8787 | -0.8943 | -1.6454 | | Average | -0.5436 | -0.6114 | -3.6982 |
|
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吴志强, 郁梅, 姜浩, 陈芬, 蒋刚毅. 基于感兴趣区域的360°全景视频编码[J]. 激光与光电子学进展, 2018, 55(6): 061013. Zhiqiang Wu, Mei Yu, Hao Jiang, Fen Chen, Gangyi Jiang. 360° Panoramic Video Coding Based on Region of Interest[J]. Laser & Optoelectronics Progress, 2018, 55(6): 061013.
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