LoopExpose: An Unsupervised Framework for Arbitrary-Length Exposure Correction

• URL: http://arxiv.org/abs/2511.06066v1
• Date: Sat, 08 Nov 2025 16:36:52 GMT
• Title: LoopExpose: An Unsupervised Framework for Arbitrary-Length Exposure Correction
• Authors: Ao Li, Chen Chen, Zhenyu Wang, Tao Huang, Fangfang Wu, Weisheng Dong,
• Abstract summary: We propose a pseudo label-based unsupervised method called LoopExpose for arbitrary-length exposure correction.<n>A nested loop optimization strategy is proposed to address the exposure correction problem.<n>Experiments on different benchmark datasets demonstrate that LoopExpose achieves superior exposure correction and fusion performance.
• Score: 43.00059667275665
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Exposure correction is essential for enhancing image quality under challenging lighting conditions. While supervised learning has achieved significant progress in this area, it relies heavily on large-scale labeled datasets, which are difficult to obtain in practical scenarios. To address this limitation, we propose a pseudo label-based unsupervised method called LoopExpose for arbitrary-length exposure correction. A nested loop optimization strategy is proposed to address the exposure correction problem, where the correction model and pseudo-supervised information are jointly optimized in a two-level framework. Specifically, the upper-level trains a correction model using pseudo-labels generated through multi-exposure fusion at the lower level. A feedback mechanism is introduced where corrected images are fed back into the fusion process to refine the pseudo-labels, creating a self-reinforcing learning loop. Considering the dominant role of luminance calibration in exposure correction, a Luminance Ranking Loss is introduced to leverage the relative luminance ordering across the input sequence as a self-supervised constraint. Extensive experiments on different benchmark datasets demonstrate that LoopExpose achieves superior exposure correction and fusion performance, outperforming existing state-of-the-art unsupervised methods. Code is available at https://github.com/FALALAS/LoopExpose.

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