论文标题
使用H.265/HEVC编码失真校正的鱼眼视频序列
Coding of distortion-corrected fisheye video sequences using H.265/HEVC
论文作者
论文摘要
Fisheye相机捕获的图像和视频由于其较大的视野而表现出强烈的径向扭曲。但是，混合视频编码方案中采用的常规框内以及框架间预测技术并非旨在应对这种扭曲。到目前为止，已捕获的鱼眼数据已被编码和存储，而无需考虑径向失真导致的任何效率损失。本文在应用失真校正作为预处理步骤时，研究了对编码效率的影响，而不是最新的后处理方法。两种方法都利用了最新的视频编码标准H.265/HEVC，并在客观和主观视频质量方面进行了比较。结果表明，使用预处理方法时，实现了框架内的最大PSNR增益为1.91 dB，用于框架间编码的1.37 dB可实现。对于框内和框架间编码的平均收益分别为1.16 dB和0.95 dB。
Images and videos captured by fisheye cameras exhibit strong radial distortions due to their large field of view. Conventional intra-frame as well as inter-frame prediction techniques as employed in hybrid video coding schemes are not designed to cope with such distortions, however. So far, captured fish-eye data has been coded and stored without consideration to any loss in efficiency resulting from radial distortion. This paper investigates the effects on the coding efficiency when applying distortion correction as a pre-processing step as opposed to the state-of-the-art method of post-processing. Both methods make use of the latest video coding standard H.265/HEVC and are compared with regard to objective as well as subjective video quality. It is shown that a maximum PSNR gain of 1.91 dB for intra-frame and 1.37 dB for inter-frame coding is achieved when using the pre-processing method. Average gains amount to 1.16 dB and 0.95 dB for intra-frame and inter-frame coding, respectively.
