Fisheye lens image distortion correction method based on orthogonal projection

A fisheye image and orthogonal projection technology, which is applied in image enhancement, image data processing, graphics and image conversion, etc., can solve problems such as barrel distortion and unsatisfactory effects, achieve accurate calculation, reduce the number of sampling times, and reduce operation the effect of time

Inactive Publication Date: 2018-11-16
LIAONING UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0006] The pictures taken by the fisheye lens show barrel-shaped distortion, and the classic projection model to correct this kind of distortion is often unsatisfactory.

Method used

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  • Fisheye lens image distortion correction method based on orthogonal projection
  • Fisheye lens image distortion correction method based on orthogonal projection
  • Fisheye lens image distortion correction method based on orthogonal projection

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Embodiment 1

[0094] A fisheye lens image distortion correction method based on orthogonal projection, comprising the following steps:

[0095] 1. Take a picture with a fisheye camera, which is a fisheye image;

[0096] 2. Perform distortion correction on the fisheye image in step 1:

[0097] (1) According to the geometric characteristics of the fisheye image, find the radius r and the center point of the fisheye image;

[0098] Step 1: Use the Canny operator to effectively extract the edge of the fisheye image, and fill in the length and width of the image to make it an integer multiple of 4, in preparation for subsequent downsampling.

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Abstract

The invention relates to a fisheye lens image distortion correction method based on an orthogonal projection, which comprises the following steps: 1) using a fisheye camera to take a picture, that is,a fisheye image; 2) performing distortion correction on the fisheye image: obtaining the radius and center point of the fisheye image according to the geometrical characteristics of the fisheye image; using an orthogonal projection to transfer the fisheye image into a hemispherical surface; using lateral and longitude curves to carry out mesh division on the hemispherical surface, thereby transferring into lateral and longitude coordinate values of the hemispherical surface; finally, projecting the lateral and longitude coordinate values to a target image coordinate to realize coarse correction conversion of the fisheye image; after using the orthogonal projection to carry out coarse correction on the fisheye image, using a plurality of angular points of the distorted checker image and the target image to carry out affine transformation; then, using a look-up table to save a coordinate mapping relation table from the fisheye image to the correction image; and using the look-up table to achieve accurate correction of the fisheye image in the checkerboard region. The method in the invention is stable in performance, safe and reliable.

Description

technical field [0001] The invention belongs to the technical field of fisheye lens images, in particular to a fisheye lens image distortion correction method based on orthogonal projection. Background technique [0002] The fisheye lens has a short focal length and is suitable for shooting close-up scenes with a wide range of viewing angles. Because of its super-large viewing angle, rich information, small size and strong concealment, it is widely used in security monitoring, video conferencing, robot navigation, panoramic parking, intelligent transportation, medical testing and machine vision and other fields. In order to accommodate scenes with a field of view close to 180 degrees or even larger, the imaging structure of the fisheye lens has been modified to adapt to its short focal length and large field of view, resulting in severe barrel-shaped distortion of the fisheye lens image and poor visual effects, making Difficult to meet normal needs. How to realize the accu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T3/00
CPCG06T3/0006G06T3/0018G06T5/006
Inventor 孙福明蔡希彪王亚君张兴
Owner LIAONING UNIVERSITY OF TECHNOLOGY
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