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arXiv · 2111.00485

Learned Image Compression with Separate Hyperprior Decoders

Zhao Zan·Chao Liu·Heming Sun·Xiaoyang Zeng·Yibo Fan
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Abstract

Learned image compression techniques have achieved considerable development in recent years. In this paper, we find that the performance bottleneck lies in the use of a single hyperprior decoder, in which case the ternary Gaussian model collapses to a binary one. To solve this, we propose to use three hyperprior decoders to separate the decoding process of the mixed parameters in discrete Gaussian mixture likelihoods, achieving more accurate parameters estimation. Experimental results demonstrate the proposed method optimized by MS-SSIM achieves on average 3.36% BD-rate reduction compared with state-of-the-art approach. The contribution of the proposed method to the coding time and FLOPs is negligible.

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Zhao Zan, Chao Liu, Heming Sun, Xiaoyang Zeng, Yibo Fan. 2021-10-31. Learned Image Compression with Separate Hyperprior Decoders. https://arxiv.org/abs/2111.00485

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