端到端优化的图像压缩技术进展  

Advances in End-to-End Optimized Image Compression Technologies

作　　者：刘东 王叶斐 林建平 马海川 杨闰宇 LIU Dong;WANG Ye-fei;LIN Jian-ping;MA Hai-chuan;YANG Run-yu(Department of Electronic Engineering and Information Science,University of Science and Technology of China,Hefei 230027,China)

机构地区：[1]中国科学技术大学电子工程与信息科学系,合肥230027

出　　处：《计算机科学》2021年第3期1-8,共8页Computer Science

基　　金：国家自然科学基金(61772483)。

摘　　要：图像压缩是数据压缩技术在数字图像上的应用,其目的是减少图像数据中的冗余,从而用更加高效的格式存储和传输数据。传统的图像压缩方法中,图像压缩分为预测、变换、量化、熵编码等步骤,每一步均采用人工设计的算法分别进行优化。近年来,基于深度神经网络的端到端图像压缩方法在图像压缩中取得了丰硕的成果,相比传统方法,端到端图像压缩可以进行联合优化,能够取得比传统方法更高的压缩效率。文中首先对端到端图像压缩的方法和网络结构进行了介绍;接着对端到端图像压缩中的关键技术进行了阐述,包括量化技术、概率建模和熵编码技术以及编码端码率分配技术;然后介绍了端到端图像压缩的扩展应用研究,包括可伸缩编码、可变码率压缩、面向视觉感知和机器感知的压缩;最后通过实验对端到端图像压缩方法目前可达到的压缩效率与传统方法进行了对比,展示了其压缩性能。实验结果表明,目前最新的端到端图像压缩方法的压缩效率远高于JPEG,JPEG2000,HEVC intra等传统图像编码方法,相比目前最先进的编码标准VVC intra,在同样的MS-SSIM上节省了高达48.40%的编码码率。Image compression is the application of data compression technologies on digital images,aiming to reduce redundancy in image data,so as to store and transmit data with a more efficient format.In traditional image compression methods,image compression is divided into several steps,such as prediction,transform,quantization and entropy coding,and each step is optimized by manually designed algorithm separately.In recent years,end-to-end image compression methods based on deep neural networks have achieved fruitful results.Compared with the traditional methods,end-to-end image compression can be optimized jointly,which often achieves higher compression efficiency than the traditional methods.In this paper,the end-to-end image compression methods and network structures are introduced,and the key technologies of end-to-end image compression are described,including quantization technology,probability modeling and entropy coding technology,as well as encoder-side bit allocation technology.Then it introduces the research of extended applications of end-to-end image compression,including scalable coding,variable bit rate compression,visual perception and machine perception oriented compression.Finally,the compression efficiency of end-to-end image compression is compared with the traditional methods,and the compression performance is demonstrated.Experimental results show that the compression efficiency of the state-of-the-art end-to-end image compression method is much higher than that of the traditional image coding methods including JPEG,JPEG2000 and HEVC intra.Compared with the newest coding standard VVC intra,the end-to-end image compression method can save up to 48.40%of the coding rate while maintain the same MS-SSIM.

关 键 词：图像压缩 端到端优化 深度神经网络 压缩效率 JPEG JPEG2000 HEVC VVC 

分 类 号：TN919.81[电子电信—通信与信息系统] TP37[电子电信—信息与通信工程]