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A Distortion-Free Camera Distortion Correction Method

A distortion correction and distortion model technology, applied in image enhancement, image analysis, instruments, etc., can solve problems such as camera distortion, avoid correction errors, improve correction accuracy, and have a wide range of applications.

Active Publication Date: 2022-03-29
JINAN UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to propose a camera distortion correction method that does not depend on the distortion model, so as to overcome the defects of current camera distortion correction using the distortion model

Method used

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  • A Distortion-Free Camera Distortion Correction Method
  • A Distortion-Free Camera Distortion Correction Method
  • A Distortion-Free Camera Distortion Correction Method

Examples

Experimental program
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Embodiment

[0075] This embodiment discloses a method for correcting camera distortion without distortion model, including the following steps:

[0076] S1. Obtain the correction template and the distorted image of the correction template:

[0077] Use the computer to generate two sets of standard sinusoidal fringe images without distortion in the vertical and horizontal directions. The vertical and horizontal directions represent the direction of the fringe. These two sets of images are used as correction templates and displayed on the flat panel display in turn; use the camera to be corrected to take these undistorted images in sequence , to obtain two sets of vertical and horizontal distorted images.

[0078] Here, the flat panel display may be a liquid crystal flat panel display, an organic light emitting diode flat panel display, or a plasma flat panel display. When the camera to be calibrated sequentially captures images of the calibration template, the optical axis of the imaging ...

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Abstract

The invention discloses a camera distortion correction method of a distortion-free model. First, a computer generates two sets of vertical and horizontal standard fringe images as correction templates and displays them on a flat panel display. The camera captures these images to obtain a distorted image; The image is phase-shifted and phase-unwrapped to obtain the phase distribution of the distorted image; the instantaneous spatial frequency distribution of the distorted image is obtained to determine the instantaneous frequency of the distortion center fringes; then the phase values ​​of the distorted image at multiple points near the distortion center are extracted, and linear Fitting, to obtain the phase value of the undistorted image; subtract the phase distribution of the distorted image and the undistorted image to obtain the distorted phase distribution of the distorted image, and then obtain the distortion distribution of the distorted image; and then obtain the distortion distribution in the corrected coordinate system and the correction map; finally, the correction map is used to correct the distortion of the image captured by the camera. The present invention corrects distorted camera images without a distortion model.

Description

technical field [0001] The invention relates to the technical field of computer vision distortion image correction and optical measurement, in particular to a camera distortion correction method without distortion model. Background technique [0002] Computer vision is to capture image information through various camera lenses and equipment, analyze and process it, and imitate human beings to realize image recognition and scene reconstruction. In order to meet the capture of scene information with a large viewing angle, lenses with wide field of view imaging characteristics are widely used in various fields. However, there are various degrees of distortion in images captured by wide-field lenses, the most notable of which is radial distortion. Radial distortion is a kind of position offset along the radial direction of the distortion center. The distortion makes it impossible to accurately determine the geometric position and size of the object in the image, and even causes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
CPCG06T2207/10004G06T5/80
Inventor 钟金钢翁嘉文周维帅
Owner JINAN UNIVERSITY
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