Pulsed laser range-gated imaging system can reduce the influence of backscattered light in water. However, when searching for targets in unknown water, it is necessary to obtain the attenuation coefficient at the laser wavelength in the water. Usually, the attenuation coefficient of the water needs to be obtained by special instruments. In this paper, a numerical analysis method is proposed to extract the attenuation coefficient of water from the images collected by the range-gated imaging system. First, radiative transfer theory is used to model the imaging process of the pulsed laser range-gated imaging system. Then, the attenuation coefficient of the water is solved by numerical analysis method. At the same time, an experimental system is built to verify the method. The results under different water conditions show that, method in this paper is feasible and effective.
Infrared simulation software is widely used in the evaluation and model training of infrared equipment. Subject to foreign restrictions, domestic infrared simulation software hardly can meet the current requirements. However, visible simulation software is relatively mature. Thus, generated infrared images from visible images could be another way to replace infrared simulation software. In this paper, a deep learning style transfer method, cycle generative adversarial network, was introduced into the infrared simulation field. We captured visible and infrared images and extracted water surface targets to establish visible-infrared datasets. The cycle generative adversarial network model was applied to generate infrared simulation images from visible images. In terms of visual effect, generated infrared images were close to infrared images. To more holistically evaluate the visual quality of our results, we employ two tactics, structural similarity, and image quality. The result shows that the distribution of generated infrared images was well-matched to the origin visible images. And the image definition and details of generated infrared images were close to infrared images.
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