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

A barrel distortion and image correction technology, which is applied in image enhancement, image data processing, instruments, etc., can solve problems such as inability to achieve correction, poor correction effect, powerlessness, etc., achieve satisfactory correction, obvious correction effect, and improved correction effect Effect

Active Publication Date: 2013-02-06
NORTHWESTERN POLYTECHNICAL UNIV
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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 Par

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

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Embodiment Construction

[0018] The technical scheme adopted by the present invention to solve the above-mentioned technical problems is: to improve the algorithm of the existing cubic polar radius relationship algorithm for each corresponding pixel of the identified restored image and the barrel-shaped distorted image, which is characterized in that it includes the following steps

[0019] Step 1. First establish the positional relationship between the corresponding pixel points between the barrel-shaped distorted image and the restored image. This step is realized in the following manner:

[0020] 1. According to the three-dimensional spherical coordinate model in the imaging principle of the fisheye lens, a two-dimensional standard coordinate system is established. Take the Cartesian coordinate system of the plane where the circular section of the hemisphere in the spherical model is located, and adjust the position of the Cartesian coordinate system so that the origin of the Cartesian coordinate sy...

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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...

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Application Information

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IPC IPC(8): G06T5/00
Inventor 齐敏张小溪李大健王强樊养余吕国云王毅
Owner NORTHWESTERN POLYTECHNICAL UNIV
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