Chinese Optics, Volume. 16, Issue 3, 596(2023)
Sea-sky-line detection method based on polarization difference images
Fig. 1. Decomposition of polarized light. (a) Distribution of partially polarized light intensity; (b) distribution of completely polarized light intensity; (c) distribution of polarization difference light intensity
Fig. 2. Polarization imaging principle of sea surface radiation in long wave infrared band ( and are the roll angle and pitch angle respectively; and are represent the s-polarized and p-polarized components respectively; represents the horizontal axis of the camera) 海面长波红外辐射偏振成像原理（图中 为滚动角， 为俯仰角， 分别表示 偏振和 偏振， 为相机水平轴）
Fig. 3. Comparison of (a) intensity image and (b) difference image (From left to right are scene 1, scene2, scene 3, scene4)
Fig. 4. Comparison of infrared intensity image and polarization difference image
Fig. 5. Determination results of sea-sky-line area by different algorithms under different interference foctors
Fig. 6. The sea-sky-line detection results by proposed algorithm in low-contrast scenes
Table 1. The LCs and SNRs of infrared intensity image and polarization difference image
View tableView in ArticleTable 1. The LCs and SNRs of infrared intensity image and polarization difference image
评价指标 图像类型 场景1 场景2 场景3 场景4 LC 强度图像 0.04 0.02 0.02 0.04 差分图像 0.33 0.32 0.28 0.29 SNR 强度图像 0.49 0.72 0.27 0.38 差分图像 1.03 1.46 0.96 0.95
Table 2. Performance comparison results by different methods
View tableView in ArticleTable 2. Performance comparison results by different methods
指标 霍夫变换 梯度方法+ 多项式拟合 累加方法+ 多项式拟合 本文方法 准确率(%) 36.9 87.7 95.4 98.5(128组) 平均耗时（ms） 91 102 112 16
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De-zhi SU, Liang LIU, Kun WANG, Shi-yong WU, Ling-shun LIU, Rui-long MING, Jian GONG. Sea-sky-line detection method based on polarization difference images[J]. Chinese Optics, 2023, 16(3): 596
Category: Original Article
Received: Aug. 17, 2022
Accepted: Nov. 2, 2022
Published Online: May. 31, 2023
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