Method for correcting barrel distortion of images for full-frame fish-eye lenses

Abstract

The invention provides a method for correcting barrel distortion of images for full-frame fish-eye lenses. The method includes: firstly, establishing corresponding pixel positional relation between a barrel-like distorted image and a restored image to obtain an expression of tertiary polar radius relation between the barrel-like distorted image and the restored image thereof; and secondly, algorithmically modifying the expression of tertiary polar radius relation, and operating the barrel-like distorted image pixel by pixel by the modified correcting relational expression to finish correction. The defect that the existing barrel distortion correcting technology with limited capacity is poor in correcting the periphery of an image is improved, a whole ultrawide-angle barrel-like distorted image generated by a full-frame fish-eye lens can be corrected satisfactorily, and especially the effect of correcting the periphery of the image is evident. The corrected image meets the requirement for image quality in image measurement in industrial application.

Description

technical field [0001] The invention provides a method for correcting barrel-shaped distorted images, especially for images with serious barrel-shaped distortions captured by a full-frame fisheye lens. Background technique [0002] In many computer vision fields such as robot and vehicle navigation, visual monitoring, and virtual scene technology, it is often necessary to obtain images with a wider range of viewing angles. Wide-angle lenses are a way to obtain images with large viewing angles, but they are expensive, and when the range of viewing angles is large, the correction effect around the edges of the image is sometimes still unsatisfactory. Fisheye lenses can obtain a larger viewing angle range than wide-angle lenses, can accommodate more scenes, and can adapt to shooting in small spaces, but its cost is relatively much lower, so it is widely used. [0003] In order to obtain images with a large field of view when taking pictures, fisheye lenses inevitably introduce...

AI Technical Summary

Problems solved by technology

These methods have good correction effects on images with less severe barrel distortion, but when correcting the barrel distortion images with large viewing angles and severe distortion produced by full-frame fisheye lenses, they seem powerless and cannot achieve complete correction, and the more Parts of the correction near the edge of the image are less effective

The affine transformation has almost no correction effect on the edge part of the image, and the correction effect of the barrel distortion image has a direct impact on whether the subsequent application can extract accurate information

Images