激光与光电子学进展, 2018, 55 (6): 061013, 网络出版: 2018-09-11
基于感兴趣区域的360°全景视频编码 下载: 1670次
360° Panoramic Video Coding Based on Region of Interest
图像处理 360°全景编码; 等矩形投影 感兴趣区域 量化参数 加权球面峰值信噪比 image processing 360° panoramic coding; equi-rectangular projection region of interest quantization parameters weighted spherical peak signal-to-noise ratio
摘要
针对360°全景视频在等矩形投影面中编码时存在冗余像素较多且较少考虑感兴趣区域(ROI)画面质量的问题,提出一种基于ROI的360°全景视频编码算法。该算法利用当前帧编码残差信息求取ROI并指导下一帧编码;利用球面到等矩形投影面的映射函数求出各纬度处像素的冗余程度,将其作为非ROI量化参数的调节因子,并与ROI量化参数调节因子共同决定每帧画面最大编码单元级别的编码参数设置。实验结果表明,在使用加权球面峰值信噪比和球面峰值信噪比全景视频客观评价方法评价编码效果时,与HEVC编码器参考软件相比,本文方法码率最高可节省4.98%,平均码率可节省2.46%,相同码率下视频质量平均提高0.145 dB。与相关代表性方法相比,ROI内容质量明显提升。
Abstract
In order to solve the problem that more redundant pixels and less consideration of picture quality of the region of interest (ROI) when the 360° panoramic video is encoded in an equirectangualr projection plane. A new ROI-based 360° panoramic video coding method is proposed, which uses the current coding residual frame information to get and guide the next frame coding. The pixel redundancy at each latitude is calculated by the mapping function from the sphere to the projection plane, which is used as the adjustment factor of quantization parameters of non-ROI. The quantization parameters of ROI and non-ROI are utilized to determine each frame's encoding parameters in largest coding unit level. The experimental results show that, compared with the HEVC encoder, for the same weighted spherical peak signal-to-noise ratio and spherical peak signal-to-noise ratio, the proposed approach can achieve an average rate reduction of about 2.46% and the most of 4.98%, for the same coding rate, it can achieve an average video quality increased 0.145 dB. The content of ROI improves obviously compared with the related representative methods.
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.