Image-based distortion removal method

Abstract

The invention relates to the technical field of image processing, in particular to an image-based distortion removal method, which comprises the following steps of: S1, acquiring a distorted image, and performing image feature extraction on the distorted image to obtain image feature information of the distorted image; s2, optical center calculation: firstly, obtaining a good distorted image by using a straight line cutting equal method, enabling image distortion to be approximately symmetrical about an image geometric center point, accurately obtaining a center coordinate of a dot on the edge of the distorted image by using an image processing technology, and taking a centroid coordinate in a dot region as the center coordinate of the dot; s3, solving an initial value of a distortion coefficient; s4, optimizing and solving a distortion coefficient; and S5, distorted graph reconstruction: in order to obtain a good corrected image, gray reconstruction, namely gray interpolation, must be carried out on the corrected image, the method is simple, convenient and practical and does not depend on internal parameters of a camera lens and a complex measuring device, and the corrected root-mean-square error and the gray reconstruction root-mean-square error both reach the sub-pixel level after correction.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to an image-based de-distortion method. Background technique [0002] The existing large field of view and short focal length lenses generally have a certain degree of optical distortion during the imaging process, which causes some changes in the size and shape of the imaged image, and reduces the quality of the image, which brings about subsequent image analysis and image measurement. error, and even cause misjudgment, so an image-based dewarping method is needed to improve the above problems. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is to provide an image-based dewarping method to solve the problems raised in the above background art. [0004] To achieve the above object, the present invention provides the following technical solutions: [0005] An image-based dewarping method, comprising the following steps: [0006] S1, obtain a disto...

AI Technical Summary

Problems solved by technology

[0002] The existing large field of view and short focal length lenses generally have a certain degree of optical distortion during the imaging process, which causes some changes in the size and shape of the imaged image, and the quality of the image decreases, which brings great harm to the subsequent image analysis and image measurement. error, and even cause misjudgment, so an image-based de-distortion method is needed to improve the above problems

Images