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Method for correcting fisheye images

A technology of fisheye image and correction method, which is applied in the field of computer vision and image processing, and can solve problems such as image distortion and impossibility of direct practical application

Inactive Publication Date: 2013-08-28
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, the images captured by the fisheye lens have obvious distortion and cannot be directly applied in practice.

Method used

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  • Method for correcting fisheye images

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Embodiment Construction

[0053] The implementation of the technical solution is described in further detail below:

[0054] Step 1: Diagonal Scanning

[0055] In this step, the circular effective area of ​​the fisheye image is determined by scanning pixels diagonally.

[0056] 1.1) For a fisheye image P, set its number of pixels to N×M=380×322, and perform grayscale conversion on all its pixels. The conversion method is:

[0057] Gray=0.072169B+0.715160G+0.202671R (21)

[0058] Among them, R, G, and B represent the red, green, and blue values ​​of each pixel, and Gray is the converted value. After transforming each pixel of the color image in this way, a grayscale image T is obtained.

[0059] 1.2) Calculate the aspect ratio of the fisheye image. Assuming that the number of fisheye image pixels is N×M=380×322, the aspect ratio is:

[0060] k = N M = 380 322 - - - ...

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Abstract

The invention relates to a method for correcting fisheye images. Through the method, a curved round-ball-shaped fisheye image is amended and recovers to a normal visible image. The method comprises the steps: scanning an angular line to confirm a round effective area of the fisheye image, computing a circle center and the radius, building a longitude line correction model and a semicircular correction model, correcting a transverse coordinate and a longitudinal coordinate respectively, and finally amending the transverse coordinate and the longitudinal coordinate respectively to form a final corrected image. The invention belongs to the field of computer vision and image processing. The method for correcting the fisheye images can be applied to correction of the fisheye images, recovers curved images, restores normal visible images of shot objects, and is simple in algorithm and easy to implement.

Description

technical field [0001] The invention relates to a correction algorithm of a fish-eye image. Determine the circular effective area of ​​the fisheye image by scanning diagonally first and calculate the center and radius, then establish a meridian correction model and a semicircle correction model, then correct the abscissa and ordinate respectively, and finally perform corrections respectively to form the final Correct the image. The invention belongs to the fields of computer vision and image processing. Background technique [0002] Fisheye lenses are widely used in many fields such as panoramic viewing, large-scale monitoring systems, and intelligent transportation systems due to their large viewing angles. However, the images captured by the fisheye lens have obvious distortion, which cannot be directly applied in practice. How to eliminate these distortions, restore the spherical fisheye image to an ordinary image, make it more in line with people's visual habits, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 杨庚斯闻豪王欣宇陈文靖程欢
Owner NANJING UNIV OF POSTS & TELECOMM
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