Single Image Dehazing Method Based on Sky Region Segmentation

Abstract

The invention discloses an image defogging method based on sky area segmentation processing. The steps are: obtaining the preliminary estimated transmittance of the input image according to the dark primary color prior theory, and using median filtering and filtering for the preliminary estimated transmittance respectively. Guided filtering is optimized, and the two are combined, and the transmittance optimized by the median filter is used to replace the transmittance optimized by the guided filtering in the halo area; the Canny edge operator is used to obtain the edge image of the original image, and the misjudgment is corrected area, divide the image into two areas: sky and ground, use it as a binary template to extract the sky area transmittance after guided filtering optimization, and perform nonlinear expansion processing on the extracted sky area transmittance; combine the above two The transmittances obtained in the respective steps are combined and guided filtering and smoothing are performed; the optimized transmittance obtained is used for filtering. The invention can better improve the halo effect and color distortion in the sky area, and greatly improve the dehazing effect of foggy 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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