Range-intensity-profile prior dehazing method for underwater range-gated imaging
Minmin Wang, Xinwei Wang, Yue Zhang, Liang Sun, Pingshun Lei, Yuqing Yang, Jianan Chen, Jun He, Yan Zhou
Abstract
This paper is concerned with the mitigation of backscatter effects in a single gated image. A range-intensity-profile prior dehazing method is proposed to estimate scene depth and finely remove water backscatter at different depths for underwater range-gated imaging. It is based on the prior that the target intensity is distributed with range intensity profiles in gated images. The depth transmission and depth-noise map are then calculated from the scene depth. A high-quality image is restored by subtracting the depth-noise map and dividing the depth transmission. The simulation and experimental results show that the proposed method works well even if a portion of the estimated depth may be smaller than its real value, and the peak signal-to-noise ratio of dehazing images gets up to a doubled increase.