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Automatic correction method and system for image radial distortion

A technology of radial distortion and distortion coefficient, applied in the field of image processing, can solve problems such as radial distortion, and achieve the effect of strong robustness

Active Publication Date: 2018-11-06
北交智轨(北京)科技有限公司
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of radial distortion in images captured by a camera, the present invention focuses on the causes of distortion and the difficulties in distortion correction at the present stage, and proposes an image diameter that automatically corrects the radial distortion generated during the image acquisition process. Automatic correction method and system for distortion

Method used

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  • Automatic correction method and system for image radial distortion
  • Automatic correction method and system for image radial distortion

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Embodiment 1

[0057] Such as figure 1 As shown, the automatic correction method for image radial distortion provided in this embodiment includes the following steps:

[0058] S1. Perform edge detection on the distorted image to obtain an edge image of the distorted image, and connect adjacent edges in the edge image to obtain each edge contour of the distorted image. In this embodiment, the Canny operator is used to realize the distorted image. Edge image extraction;

[0059] S2. Use the fast arc extraction method to extract the arcs of each edge contour of the distorted image, obtain the arcs corresponding to each edge contour, and calculate the parameters of each arc respectively;

[0060] S3. Use the center of the distorted image as the center of the area to define the pre-selected area of ​​the distortion center, and calculate the distortion of each arc corresponding to each pixel in the pre-selected area of ​​the distortion center as the distortion center based on the general equation...

Embodiment 2

[0129] Such as Figure 8 As shown, the automatic correction system for image radial distortion provided in this embodiment is used to implement the automatic correction method for image radial distortion provided in Embodiment 1, and the system includes:

[0130] The distorted image contour extraction module performs edge detection on the distorted image, obtains an edge image of the distorted image, and connects adjacent edges in the edge image to obtain the edge contour of the distorted image;

[0131] The arc extraction module in the edge contour performs a fast arc extraction algorithm based on the nature of the arc on the edge contour of the distorted image, obtains all arcs in the edge contour, and calculates the arc parameters of all arcs respectively;

[0132] The parameter estimation module traverses each position of an area near the center of the image, calculates the eigenvalues ​​of the distortion coefficients of the corresponding arcs based on the arc parameters o...

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Abstract

The invention discloses an automatic correction method and system for image radial distortion. The method includes: S1. Detecting the edges of the distorted image and connecting adjacent edges to obtain each edge contour; S2. Using a fast arc extraction method to arc the edge contours. Extract and calculate the parameters of each arc; S3. Delineate the preselected area of ​​the distortion center, calculate the distortion coefficient of each arc corresponding to each pixel as the distortion center, and calculate the concentration range of the distortion coefficient corresponding to each pixel. Count the number of distortion coefficients in each interval, calculate the mean value of the distortion coefficient in each interval, use the pixel corresponding to the interval with the most distortion coefficients as the actual distortion center, and use the mean value of the distortion coefficient in this interval as the actual distortion coefficient; S4. According to the actual distortion The center and distortion coefficients are used to automatically correct distorted images. The invention can realize automatic correction of image radial distortion without requiring source information, specific templates and manual intervention related to the distorted image.

Description

technical field [0001] The invention relates to the technical field of image processing. More specifically, it relates to an automatic correction method and system for image radial distortion. Background technique [0002] With the progress of human society and the development of science and technology, computer vision has become one of the hottest topics in the computer field. Especially with the wide application of road surveillance cameras and car cameras in daily life, people have put forward higher requirements for the range that the cameras can monitor, so wide-angle lenses will also appear more and more in real life. However, the image acquired by the wide-angle lens will produce obvious distortion, which does not conform to people's visual habits, and the distortion will have a very serious impact on the algorithms of spatial positioning and target tracking that rely on image-related information. Most of the algorithms in the field of computer vision Both rely on t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G06T7/13G06T7/136
CPCG06T2207/20228G06T2207/20182G06T5/70
Inventor 刘渭滨李乐邢薇薇郭玉翠
Owner 北交智轨(北京)科技有限公司
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