Single image defogging method based on sky region segmentation processing

Abstract

The invention discloses a single image defogging method based on sky region segmentation processing, comprising the steps of: calculating the preliminary estimation transmittance of an input image according to a dark channel prior theory, optimizing the preliminary estimation transmittance respectively through median filtering and guide filtering, combining two results, and replacing the transmittance optimized by halo region guide filtering with the transmittance optimized by median filtering; employing a Canny boundary operator to calculate the boundary images of original images, correcting miscalculated regions, dividing the images into sky and ground regions to be used as binary template to extract the sky region transmittance after guide filtering optimization, and performing non-linear expansion processing on the extracted sky region transmittance; combining the transmittance respectively obtained through the two steps, and performing guide filtering smooth processing; and utilizing obtained optimization transmittance to perform filtering processing. The single image defogging method can better improve halo effects and sky region color distortion, and greatly improve defogging effects of fog-degraded images.

Description

technical field [0001] The invention belongs to the technical field of image processing, and in particular relates to a method for defogging haze images, and is especially suitable for haze images including sky areas. Background technique [0002] In modern society, a large number of systems rely on imaging equipment to obtain relevant information of targets, such as traffic, surveillance, and remote sensing imaging. In recent years, large-scale smog weather has occurred frequently in northern my country, and the quality of images acquired by outdoor imaging equipment has deteriorated in smog weather, causing related systems to fail to work normally. The impact of haze on imaging equipment is mainly caused by the scattering effect of haze particles, and the light reflected from objects deviates from the transmission path during the propagation process and does not participate in imaging. On the other hand, other light in the environment will also be scattered by the haze pa...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method of defogging suitable for haze images containing sky areas, which can overcome the color distortion problem caused by the existing dark channel algorithm in the sky area, and the poor improvement of the halo effect by the existing optimization algorithms The problem

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