Abstract
Compared with the atmospheric imaging, in underwater electro-optic imaging (UEOI), there exist difficulties to describe the target discrimination level within the visibility range, because of the media scattering and inhomogeneous illumination. The large-scale contrast is used to describe the target discrimination traditionally, while it is not linear to human perception. In this paper, the detectability of a UEOI system is firstly defined to quantify the perceptive target discrimination level in full space. And we present a target detectability assessment metric (TDAM), which is used to illustrate the detectability distribution of a UEOI system. Additionally based on the large-scale contrast, an automatic detectability calculation pipeline is proposed, and a trapper-shaped function fits the contrast and detectability well, with the Spearman rank order correlation coefficient (SROCC = 0.8852), Pearson linear correlation coefficient (PLCC = 0.8965) and root-mean-square error (RMSE = 1.6532).
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