Serious barrel distortion image correction method based on nonlinearity inverse mapping principle

A barrel distortion and image correction technology, applied in image enhancement, image data processing, instruments, etc., can solve problems such as information error, blurred filling area, image blur, etc., and achieve complete information, good interpolation effect, and improved image quality Effect

Active Publication Date: 2013-07-24
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current common hole filling methods mentioned above cannot completely and correctly fill all the holes
For example: the median filtering and mean filtering methods can eliminate the holes in the middle area of ​​the restored image

Method used

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  • Serious barrel distortion image correction method based on nonlinearity inverse mapping principle
  • Serious barrel distortion image correction method based on nonlinearity inverse mapping principle
  • Serious barrel distortion image correction method based on nonlinearity inverse mapping principle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] The key of the present invention is to obtain the cubic spline function by controlling the number n of interpolation points, which can well describe the corresponding relationship between the barrel-shaped distorted image and the restored image. Taking an image with a size of 640×480 as an example, examples 1 to 3 of the correction relational coefficients are shown in the table below, and different n values ​​are selected, and good barrel distortion correction effects are achieved without holes at all. Here, b, θ, a 1 、a 2 、a 3 The values ​​of are 0.8, 0.65, 0.60574, 0.000002, 0.000003 respectively. Embodiment 1: n=5

[0096] k

[0097] 5

Embodiment 2

[0098] Embodiment 2: n=22

[0099] k

Embodiment 3

[0100] Embodiment 3: n=45

[0101] k

R interval

a k

b k

c k

d k

1

[0.000000,3.103825]

-0.14910

1.1274

-0.29208×10 -15

0.61305×10 -15

2

[3.103825,7.279870]

-0.086612

1.6611

-7.8086

17.226

[0102] 3

[7.279870,11.478998]

0.023201

-0.73713

9.6505

-25.140

4

[11.478998,15.315540]

-0.0069997

0.30288

-2.2878

20.540

5

[15.315540,19.588279]

0.0015564

-0.090239

3.7331

-10.198

6

[19.588279,23.918891]

-0.00046770

0.028708

1.4031

5.0155

7

[23.918891,27.907045]

0.000088787

-0.011223

2.3582

-2.5996

8

[27.907045,32.383505]

-0.000060157

0.0012467

2.0102

0.63757

9

[32.383505,36.957380]

-0.000017862

-0.0028623

2.1433

-0.79878

10

[36.957380,41.202092]

-0.000022015

-0.0024019

2.1263

-0.58917

...

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PUM

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Abstract

The invention provides a serious barrel distortion image correction method based on a nonlinearity inverse mapping principle. The correction method includes the steps: firstly, confirming the basic correction relation of a barrel distortion image; further, solving the barrel distortion correction relation based on the nonlinearity inverse mapping principle; calculating the polar radius, corresponding to the polar radius in the barrel distortion image, of each pixel in a restore image point-by-point; then mapping the barrel distortion image and the restore image from a polar coordinate system to a standard coordinate system; and giving pixel grey values of the corresponding position of the barrel distortion image to the restore image. Therefore, correction is accomplished. By means of the serious barrel distortion image correction method based on the nonlinearity inverse mapping principle, all cavities in a serious barrel distortion correction image are eliminated completely, the restored grey values at the cavity position can reflect the grey information of an original image correctly, therefore, the information of the restore image is integral and correct, and image quality is improved further.

Description

technical field [0001] The invention relates to a distortion correction method for completely eliminating corrected holes in barrel-shaped distorted images, in particular to a distortion correction method for completely eliminating corrected holes in severely barrel-shaped distorted images. Background technique [0002] In many computer vision fields such as aerospace and aerial photography, medical electronic endoscope, robot and vehicle navigation, visual monitoring and virtual scene technology, it is often necessary to obtain images with a wider range of viewing angles. The full-frame fisheye lens has a larger viewing angle range than a wide-angle lens, can accommodate more scenes, and can adapt to shooting in a small space. Although it inevitably introduces serious barrel distortion while obtaining a super-large field of view image, the image After distortion correction, rich and accurate data information can be extracted, so it has a high application value in various in...

Claims

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Application Information

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IPC IPC(8): G06T5/00
Inventor 齐敏齐榕樊养余李珂家建奎赵子岩
Owner NORTHWESTERN POLYTECHNICAL UNIV
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