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arXiv · 2303.05744

QVRF: A Quantization-error-aware Variable Rate Framework for Learned Image Compression

Kedeng Tong·Yaojun Wu·Yue Li·Kai Zhang·Li Zhang·Xin Jin
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Abstract

Learned image compression has exhibited promising compression performance, but variable bitrates over a wide range remain a challenge. State-of-the-art variable rate methods compromise the loss of model performance and require numerous additional parameters. In this paper, we present a Quantization-error-aware Variable Rate Framework (QVRF) that utilizes a univariate quantization regulator a to achieve wide-range variable rates within a single model. Specifically, QVRF defines a quantization regulator vector coupled with predefined Lagrange multipliers to control quantization error of all latent representation for discrete variable rates. Additionally, the reparameterization method makes QVRF compatible with a round quantizer. Exhaustive experiments demonstrate that existing fixed-rate VAE-based methods equipped with QVRF can achieve wide-range continuous variable rates within a single model without significant performance degradation. Furthermore, QVRF outperforms contemporary variable-rate methods in rate-distortion performance with minimal additional parameters.

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Kedeng Tong, Yaojun Wu, Yue Li, Kai Zhang, Li Zhang, Xin Jin. 2023-03-10. QVRF: A Quantization-error-aware Variable Rate Framework for Learned Image Compression. https://arxiv.org/abs/2303.05744

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