arXiv Computer Vision By Yue Yu, Bowei Kang, Changsheng Gao, Dong Liu, Xiaoyan Sun

WaveLLM: Wavelet-Domain LLM Entropy Modeling for Lossless Image Compression

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WaveLLM introduces a wavelet-domain entropy model that leverages large language models for lossless image compression. By decomposing images into multi-level wavelet subbands, it transforms heterogeneous prediction tasks into structured, statistically homogeneous subproblems, enabling more effective autoregressive probability estimation. Using a dedicated numerical interface and task-adaptive prompting, WaveLLM, built on Llama‑3.2‑3B with LoRA, achieves state‑of‑the‑art bpsp results on Kodak, CLIC.pro, and DIV2K, outperforming both PixelCNN‑based codecs and recent LLM‑based compressors.

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