Practical Learned Lossless JPEG Recompression with Multi-Level Cross-Channel Entropy Model in the DCT Domain

• URL: http://arxiv.org/abs/2203.16357v1
• Date: Wed, 30 Mar 2022 14:36:13 GMT
• Title: Practical Learned Lossless JPEG Recompression with Multi-Level Cross-Channel Entropy Model in the DCT Domain
• Authors: Lina Guo, Xinjie Shi, Dailan He, Yuanyuan Wang, Rui Ma, Hongwei Qin, Yan Wang
• Abstract summary: We propose a deep learning based JPEG recompression method that operates on DCT domain. Experiments show that our method achieves state-of-the-art performance compared with traditional JPEG recompression methods.
• Score: 10.655855413391324
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: JPEG is a popular image compression method widely used by individuals, data center, cloud storage and network filesystems. However, most recent progress on image compression mainly focuses on uncompressed images while ignoring trillions of already-existing JPEG images. To compress these JPEG images adequately and restore them back to JPEG format losslessly when needed, we propose a deep learning based JPEG recompression method that operates on DCT domain and propose a Multi-Level Cross-Channel Entropy Model to compress the most informative Y component. Experiments show that our method achieves state-of-the-art performance compared with traditional JPEG recompression methods including Lepton, JPEG XL and CMIX. To the best of our knowledge, this is the first learned compression method that losslessly transcodes JPEG images to more storage-saving bitstreams.

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