HUANG Yaoquan,GU Yuhai,JIA Ran,et al.Dual-track morphology-guided multi-exposure image fusion for western blotting[J].Optics and Precision Engineering,2026,34(15):2410-2421.
Single-exposure Western blot (WB) imaging is limited by a restricted dynamic range, saturation of high-abundance protein bands, and loss of low-abundance signals. A dual-channel morphology-guided multi-exposure fusion algorithm (MGAWF) is proposed to address these limitations. A multi-cue weighting model incorporating adaptive exposure, morphological saliency, and spatial attention is designed for WB multi-exposure image sequences. The final weight map is generated through nonlinear gain adjustment and normalization. In the dual-channel pyramid framework, morphology-guided gating enables nonlinear multiscale feature extraction in the image-decomposition channel, whereas a Gaussian pyramid smooths the weight map across scales. The fused high-dynamic-range image is reconstructed by multiscale linear fusion followed by inverse Laplacian-pyramid transformation. Experimental results yielded a standard deviation of 20.62, a spatial frequency of 3.92, and a sum of correlations of differences of 0.80. The method suppressed halo and artifact formation near high-contrast band edges, reduced background noise, and preserved low-abundance band signals. Quantitative optical-density analysis indicated improved response sensitivity and an expanded effective dynamic range. MGAWF provides a quantitative image-reconstruction approach for multi-exposure WB imaging and supports reliable protein-band analysis over a broader signal range.
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