A fisheye image correction method based on multi-step correction

Abstract

The invention introduces a fish-eye image correction method based on multistep correction, and aims at overcoming the disadvantages of image magnification and loss of edge information caused by a normal correction model in the prior art. A correction model is established based on multistep correction. A size zooming factor, based on a polynomial model, of a fish-eye image is established; the fish-eye image is corrected for the first time by utilizing the size zooming factor; interpolation is carried out on the image corrected for the first time in a neighborhood interpolation method; a division model based on a backward mapping method is established; and via the division model, the image after interpolation is corrected for the second time to obtain a secondary corrected image. The fish-eye image is corrected via the correction model, the problems including loss of edge information, image magnification, distortion and incomplete correction of the corrected images are solved, most information of a fish-eye lens is completely reserved, and the condition that the edge of the image is fuzzy is changed.

Description

technical field [0001] The invention relates to the fields of image processing and machine vision, in particular to a fisheye image correction method based on multi-step correction. Background technique [0002] Fisheye lens is a special wide-angle lens, its field of view is close to, equal to or even greater than 180 degrees, and can image objects in the hemispherical airspace or even the super-hemispherical airspace within a limited range of the image plane. From the perspective of optical design, the lens used in the fisheye lens has a large spherical curvature and is closer to the imaging plane. This special structural feature and imaging feature, on the one hand, enables the fisheye camera to obtain a large field of view, and can be widely used in real-life scenes that require a large field of view, such as robot navigation, video conferencing, real-time monitoring, panoramic photography, and astronomical observation. On the other hand, due to the introduction of large...

AI Technical Summary

Problems solved by technology

From the current engineering practice, although these algorithms can achieve distortion correction to different degrees, the correction of large distortion images such as fisheye images is often local, that is to say, there is loss of image edge information, and image local Disadvantages such as magnification, which violates the original intention of people using fisheye lenses, weakens the advantages of wide-angle lenses to a certain extent

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