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arXiv 1909.04802eess.IVcs.CV
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基于条件自编码器的可变速率深度图像压缩

Variable Rate Deep Image Compression With a Conditional Autoencoder

Samsung Semiconductor Inc.(三星半导体公司)

Yoojin Choi, Mostafa El-Khamy, Jungwon Lee

摘要:

在本文中,我们提出了一种新的可变速率学习图像压缩框架与条件自动编码器。以前的基于学习的图像压缩方法大多需要针对不同的压缩率训练单独的网络,以便它们可以产生不同质量的压缩图像。相比之下,我们训练和部署只有一个可变速率图像压缩网络实现的条件自动编码器。我们提供两个速率控制参数,即,拉格朗日乘子和量化仓大小,它们作为网络的条件变量给出。通过改变拉格朗日乘数来执行对目标的粗速率自适应,而速率可以通过调整在量化编码表示中使用的bin大小来进一步微调。实验结果表明,该方案比传统的可变速率图像压缩编解码器(如JPEG 2000和BPG)提供了更好的率失真折衷。我们的模型还显示出与最先进的学习图像压缩模型相当的性能,有时甚至更好,这些模型部署了针对不同速率训练的多个网络。

英文摘要:

In this paper, we propose a novel variable-rate learned image compression framework with a conditional autoencoder. Previous learning-based image compression methods mostly require training separate networks for different compression rates so they can yield compressed images of varying quality. In contrast, we train and deploy only one variable-rate image compression network implemented with a conditional autoencoder. We provide two rate control parameters, i.e., the Lagrange multiplier and the quantization bin size, which are given as conditioning variables to the network. Coarse rate adaptation to a target is performed by changing the Lagrange multiplier, while the rate can be further fine-tuned by adjusting the bin size used in quantizing the encoded representation. Our experimental results show that the proposed scheme provides a better rate-distortion trade-off than the traditional variable-rate image compression codecs such as JPEG2000 and BPG. Our model also shows comparable and sometimes better performance than the state-of-the-art learned image compression models that deploy multiple networks trained for varying rates.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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