Abstract
When light transports in water, it will be scattered and absorbed by the water body and water particles, resulting in blurred images and color distortion. In order to improve the quality of underwater imaging, the local linear model and restoration method of underwater images are proposed in this paper. Based on the distance-invariant feature in the local region, the local linear model is established, and the slope and intercept of the model represent the transmission rate and the backscattered light of the local region of the image, respectively. Utilizing this model, the problem of underwater image restoration has been transformed into the problem of solving the slope and intercept of linear equations. To solve the linear imaging model, the concept of local special-value is defined in this paper, and several fitting points can be obtained through the special-value. Then the linear model is solved by the fitting method, and the restoration of underwater images is completed. The restoration results of different underwater scene images verify that the linear model has a good effect in improving the image clarity and removing the color distortion.
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