MSF‐ACA: Low‐Light Image Enhancement Network Based on Multi‐Scale Feature Fusion and Adaptive Contrast Adjustment

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Abstract
To address the issues of loss of important detailed features, insufficient contrast enhancement and high computational complexity in existing low-light image enhancing methodologies, this paper presents a low-light image enhancement network(MSF-ACA), which uses multi-scale feature fusion and adaptive contrast adjustment. Focus is placed on designing the local-global image feature fusion module (LG-IFFB) and the adaptive image contrast enhancement module (AICEB), in which the LG-IFFB adopts the local-global dual-branching structure to extract multi-scale image features, and utilizes the element-by-element multiplication method to fuse the local details with the global illumination distribution to alleviate the problem of serious loss of image details, while the AICEB fuses the linear contrast The AICEB incorporates linear contrast enhancement and confidence adaptive stopping mechanism, which dynamically adjusts the computational depth according to the confidence of the feature map, balancing the contrast enhancement and computational efficiency. According to the results of the experiment, the parameter count of MSF-ACA is 0.02M, and compared with today's mainstream algorithms, the suggested model attains 21.53dB in PSNR when evaluated on the LOL-v2-real evaluation dataset, and the BRI is as low as 16.04 on the unpaired dataset DICM, which provides a better detail clarity and color fidelity in visual enhancement, and it is a highly efficient and robust low-light image model.
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