Adaptive wide-angle image correction method and device based on segmented mapping of single mesh

Abstract

The invention discloses a self-adaptive wide-angle image correction method and device based on single mesh map segmentation mapping, the invention not only realizes the automatic extraction of controlpoint pairs, but also adapts to the optimal segmentation correction according to the lens distortion degree, realizes the automatic correction processing and improves the local and global correctionaccuracy. The method comprises the following steps: preprocessing the distorted mesh template image to obtain a single pixel binary distorted mesh template image; the neighborhood features of the intersection points are used to extract the control point pairs from the distorted mesh template graph. The minimum subsection optimization model of radial distortion is established. The inverse correction mapping table is established to obtain the coordinate correspondence between the correction result map and the original distorted image. Coordinate inverse mapping process is performed to obtain a first correction result image; a bilinear interpolation algorithm is used to perform pixel interpolation on the first correction result image, and the gray value is restored to obtain a complete secondcorrection result image.

Description

technical field [0001] The present invention relates to the technical field of wide-angle image correction, and in particular to an adaptive wide-angle image correction method and device based on segmented mapping of a single grid map. Background technique [0002] Compared with ordinary lenses, wide-angle lenses can obtain images with more target information in a wider field of view due to their short focal length, large field of view, and long depth of field, greatly reducing visual blind spots. Therefore, it is widely used in many visual fields such as industrial monitoring, video surveillance, assisted driving, robot navigation, medical endoscopy, and virtual reality. However, due to the manufacturing defects of the wide-angle lens and the nonlinear imaging mechanism, there are relatively serious barrel distortions in the captured images. Wide-angle barrel distortion mainly includes thin prism distortion, tangential distortion and radial distortion. This nonlinear dist...

AI Technical Summary

Problems solved by technology

For a large field of view lens with severe distortion, these two types of models can only effectively correct the area around the distortion center, but for the four corners of the image, the correction accuracy is low and the effect is very poor

For example, patent application No. 201410424349.8 "A Method of Image Correction after Fisheye Lens Calibration", similar to Zhang's calibration method, uses the checkerboard grid calibration method to obtain the parameters of the high-order polynomial model, due to the integrity requirements of the grid blocks of the checkerboard template diagram , the control points in this type of template image cannot cover the entire viewing angle area, resulting in the inability to calibrate the corner area of ​​the image, so all areas of the distorted image cannot be effectively restored

No. 201510514238.0 patent application "A Method for Accurately Correcting Image Distortion of Ultra-Wide-Angle Camera" has been improved on this basis, and the correction accuracy and the range of correction angle of view have been improved to a certain extent, but the overall correction effect is not good

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