2009 IEEE Trans. Pattern Anal. Mach. Intell. 31 385], in which the degrees of linear polarization (DoLPs) of target light and backscattered light are used to recover clear image. A variety of improved methods have been derived from this, but most of them require background areas and human-computer interaction. Then, a new underwater active polarization imaging method without prior knowledge was presented by Zhao [Zhao Y, He W, Ren H, Li Y, Fu Y 2022 Opt. Lasers Eng. 148 106777], in which the DoLPs of target light and backscattered light can be automatically obtained without background region. However, sometimes the above two parameters are very close and thus introduce a lot of noise into the restored images, for this method takes only the contrast into account.In this work, an underwater active polarization imaging method based on two-layer multi-index optimization is proposed. First, the mutual information and contrast are taken as the upper objective functions, and the Pareto optimal solution set is obtained by the multi-objective genetic optimization algorithm. Second, the information entropy is taken as the lower objective function to obtain the optimal parameters from this optimal solution set. Based on the optimal parameters, the restored images are obtained. According to the difference between the DoLPs of target light and backscattered light, these restored images are further improved by the digital image processing method.The experimental results indicate that our method can not only enhance image details effectively but also balance various evaluation indexes of the imaging quality to obtain high-quality restored images. The proposed algorithm is suitable for underwater targets with low and high DoLPs, with or without background regions."> - 必威体育下载

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    Gao Chen-Dong, Zhao Ming-Lin, Lu De-He, Dou Jian-Tai
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    • Abstract views:3742
    • PDF Downloads:104
    • Cited By:0
    Publishing process
    • Received Date:21 October 2022
    • Accepted Date:12 December 2022
    • Available Online:09 February 2023
    • Published Online:05 April 2023

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