Fisheye image correction method after calibration conducted by fisheye lens

A fisheye lens, fisheye image technology, applied in image enhancement, image analysis, image data processing and other directions, can solve problems such as image distortion

Active Publication Date: 2014-12-24
SUN YAT SEN UNIV +1
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of distortion caused by the image formed by the fisheye lens, and to provide a method for correc

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  • Fisheye image correction method after calibration conducted by fisheye lens
  • Fisheye image correction method after calibration conducted by fisheye lens
  • Fisheye image correction method after calibration conducted by fisheye lens

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no. 1 example

[0102] figure 1 The complete process of the first embodiment of the method of the present invention is shown.

[0103] Step 1: Establish a complete fisheye camera projection and distortion model, and establish a fisheye imaging relationship on the model; the spherical model of the fisheye camera is as follows figure 2 As shown, let the imaging point of the space scene point X=[X, Y, Z, 1] on the fisheye image be p=[u, v] τ ; The complete model of fisheye camera projection imaging is described by the following equations:

[0104] λ u v f ( ρ ) = PX - - - ( 1 )

[0105] Where λ is a parameter, λ>0; P is called ...

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Abstract

The invention belongs to the field of digital image processing and discloses a fisheye image correction method after calibration conducted by a fisheye lens. The method includes the steps that firstly, a complete fisheye camera projection and distortion model is established and is a commonly-used fisheye model, a self-made planer calibration board and the commonly-used fisheye model are used for calibrating model parameters of a fisheye camera, and the calibrated lens distortion parameters are used for restoring circular distortion fisheye images to perspective images meeting the requirements for the human eye visual effect. The fisheye lens calibration and fisheye distortion correction method based on a planar checkerboard is quite suitable for occasions such as visual navigation and mobile monitoring. The method is suitable for the circular fisheye images and incomplete fisheye images can be corrected as well.

Description

technical field [0001] The invention relates to the technical field of digital image processing, and more particularly, to a method for restoring a distorted image after calibration of a fisheye lens. Background technique [0002] The fisheye lens can obtain scene information close to the hemisphere at one time, which is convenient to use, but the fisheye image acquired by the fisheye lens has very serious deformation, and the large image distortion is not conducive to human observation and machine recognition. To utilize information from these severely distorted images, it is necessary to correct the distorted images into perspective projection images. In many applications, it is necessary to correct the distortion, and the pre-processing part of the correction algorithm is generally to obtain model parameters by camera calibration. Camera calibration is the first step to realize fisheye distortion correction, and it is a key research point of fisheye lens in image distort...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06T5/00
Inventor 谭洪舟曾庆立郑亮陈荣军朱雄泳其他发明人请求不公开姓名
Owner SUN YAT SEN UNIV
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