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A Distortion Correction Method for Fisheye Lens

A fisheye lens and distortion correction technology, applied in image data processing, optics, instruments, etc., can solve the problems of difference, existence of imaging, not considering the specificity of fisheye camera, etc., to improve speed and efficiency, and improve accuracy. Effect

Inactive Publication Date: 2011-12-07
NINGBO UNIV
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Problems solved by technology

[0004]In addition, the existing fisheye correction method does not take into account the specificity of the fisheye camera itself, and corrects all fisheye cameras with a fixed parameter model
However, in practical applications, even fisheye cameras of the same manufacturer, the same brand, or even the same batch have imaging differences.

Method used

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  • A Distortion Correction Method for Fisheye Lens
  • A Distortion Correction Method for Fisheye Lens
  • A Distortion Correction Method for Fisheye Lens

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Embodiment Construction

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0035] In this embodiment, the distortion correction method of the fisheye lens includes the following two steps:

[0036] step one:

[0037] First establish the coordinate mapping table of the fisheye lens image, and save the coordinate mapping table in the memory, this step is realized in the following way:

[0038] 1. According to the spherical coordinate model in the imaging principle of fisheye lens, establish a standard coordinate system, that is: establish a standard coordinate system, see figure 2 As shown in , adjust the direction and position of the standard coordinate system, place the camera of the fisheye lens at the coordinate origin o, shoot in the direction along the positive direction of the oz axis, and the fisheye image after shooting falls on the oxy plane;

[0039] 2. Establish the target viewing plane: in the positive...

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Abstract

The invention relates to a distortion correction method of a fisheye lens, which is characterized in that it comprises two steps: step 1, establishing a coordinate mapping table of a fisheye lens image, and storing the coordinate mapping table in a memory; step 2: according to step 1 In the coordinate mapping table saved in , the fisheye image acquired by the fisheye lens described in step 1 is restored to the target image by means of table lookup, and the target image is output as a distortion-corrected image. Compared with the prior art, the present invention can set different parameter values ​​for different fisheye lenses and generate different coordinate mapping tables to improve the accuracy of fisheye correction. After the mapping table is put into the memory, the image processing time will be reduced It is no longer limited by the complexity of the algorithm, but mainly determined by the access time of the memory, which greatly improves the speed and efficiency of fisheye image distortion correction, and meets the real-time requirements in industrial applications.

Description

technical field [0001] The invention relates to a distortion correction method of a fisheye lens. Background technique [0002] Fisheye lens is an ultra-wide-angle lens that simulates the effect of underwater fish looking up at the water surface. Its typical field of view is 180°, and some exceed 180°, greater than 220°, and even reach 270°. The fisheye lens has many advantages: a large viewing angle, can accommodate many scenes, and can adapt to shooting in a small space, so it is widely used in many computer vision fields such as virtual reality technology, robot navigation, and visual monitoring. Structurally speaking, the fisheye lens is indeed similar to the fisheye structure, and there are two types of fisheye lenses, one is called Circular Image Fisheye (circular fisheye), and the other is called Full Frame Fisheye (full-frame fisheye), the viewing angle of its design is basically 180°. Due to the ultra-wide viewing angle of the image captured by the fisheye lens, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G06T3/40G02B13/06
Inventor 杨鸣杨翠翠邱元芳过森君余孟凤蒋金涛邵华
Owner NINGBO UNIV
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