基于生成模型的视频图像重建方法综述

doi:10.11959/j.issn.1000-436x.2022178

Abstract

Abstract:

Traditional video compression technology based on pixel correlation has limited performance improvement space, semantic compression has become the new direction of video compression coding, and video image reconstruction is the key link of semantic compression coding.First, the video image reconstruction methods for traditional coding optimization were introduced, including how to use deep learning to improve prediction accuracy and enhance reconstruction quality with super-resolution techniques.Second, the video image reconstruction methods based on variational auto-encoders, generative adversarial networks, autoregressive models and transformer models were discussed emphatically.Then, the models were classified according to different semantic representations of images.The advantages, disadvantages, and applicable scenarios of various methods were compared.Finally, the existing problems of video image reconstruction were summarized, and the further research directions were prospected.

Key words: video compression coding, image reconstruction, generative adversarial network, variational auto-encoder, Transformer model

CLC Number:

TN91

Yanwen WANG, Weimin LEI, Wei ZHANG, Huan MENG, Xinyi CHEN, Wenhui YE, Qingyang JING. Survey on video image reconstruction method based on generative model[J]. Journal on Communications, 2022, 43(9): 194-208.

Figures/Tables 13

References 88

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类别	目的	原理	主要方法
帧内预测	消除空间冗余	基于相邻重建像素预测当前编码块	优化预测模式、直接预测像素值、对传统预测结果进行增强
帧间预测	消除时间冗余	基于先前重建帧为参考，利用运动估计和运动补偿完成预测	增强参考帧质量与多样性、双向帧间预测、分数像素插值、光流估计
超分辨率重建	提升图像质量	编码端下采样降低图像分辨率/解码端上采样提高重建图像分辨率	传统下采样+深度网络上采样、深度网络下采样+深度网络上采样

模型	重建依据	特点
变分自编码器	编解码端学习条件分布，用于拟合真实分布	数学方法明确，易于训练，但对于复杂图像生成样本模糊
生成对抗网络	边缘、颜色、纹理	适用对象更广泛，但目前用于实验的视频分辨率较低
	面部结构特征点、特征域关键点	压缩比更高，但对动作主体要求较为严格，适用场景单一
	语义分割图	同时建立语义与结构表示，但传输语义图会消耗较多码流
自回归像素建模	将图像像素联合分布转换为条件分布，逐像素点预测	善于捕捉图像局部细节，但无法并行计算，重建速度慢且计算成本高
Transformer	直接对像素建模	善于建模图像长期相关性，增大感受野，但难以保证生成图像分辨率
	自回归预测图像的离散视觉标记，将其映射回像素空间	离散数据使图像特征表示更高效，但自回归重建时间相对较长
	掩码视觉token	更高效地利用数据进行表征学习，但对于视频的应用较少
	利用Transformer搭建GAN的生成框架	更好地捕捉全局信息，但计算成本较高

Survey on video image reconstruction method based on generative model

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