Wide-angle fisheye image correction method

A fisheye image and wide-angle technology, applied in the field of image processing, can solve problems such as poor image distortion, visual effects, and incomplete image outlines, and achieve the effects of improving bending, wide application range, and high image correction accuracy

Active Publication Date: 2019-09-03
HOHAI UNIV CHANGZHOU
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Problems solved by technology

However, the outline of the wide-angle fisheye image is not a typical circle, the image outline is incomplete and after traditional algorithm correction, the image still has a large distortion and the visual effect is not good

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  • Wide-angle fisheye image correction method
  • Wide-angle fisheye image correction method

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Embodiment Construction

[0042] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0043] The invention provides a wide-angle fisheye image correction method. The method regularizes the wide-angle fisheye image, and performs nonlinear equidistant projection correction based on longitude and latitude mapping. The image maintains good verticality, and the main features in the image conform to vertical invariance and The linearity of the horizontal direction improves the bending phenomenon of the straight line in the horizontal direction with a large field of vision, which is in line with the visual habits of the human eye.

[0044] Such as figure 1 As shown, it is a flowchart of implementation steps of a wide-angle fisheye image correction method in the present invention, includ...

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Abstract

The invention discloses a wide-angle fisheye image correction method, and the method comprises the following steps: S101, manufacturing a checkerboard calibration template, and obtaining the internalparameters of a fisheye lens; s102, converting the wide-angle fisheye image into a typical circular contour; s103, normalizing the pixel coordinates in the target image; s104, determining a visual field range of the output image in the original fisheye image; s105, calculating spherical three-dimensional coordinates corresponding to pixel points of the target image; s106, adjusting spherical three-dimensional coordinates corresponding to pixel points of the target image; s107, finding the corresponding relation between the pixels and the spatial positions by adopting non-uniformly changed concentric circles; and S108, obtaining fisheye image coordinates corresponding to the pixel coordinates of the target image. According to the wide-angle fisheye image correction method provided by the invention, the image acquired by the wide-angle fisheye lens can be processed and converted into the corrected image, the visual effect of the image is improved, the image with obvious distortion is corrected into the image conforming to the visual habit of human eyes, and the subsequent recognition and analysis of the image content are facilitated.

Description

technical field [0001] The invention specifically relates to a wide-angle fisheye image correction method, which belongs to the technical field of image processing. Background technique [0002] Fisheye lens is a special wide-angle lens with a viewing angle of 180° or greater than 180°. The lens has a precise structure, small size, and strong stability. The fisheye lens imitates the special functional structure of the fisheye, and utilizes the principle of the propagation and refraction of light waves in optically dense media and optically sparse media. Compared with the wide-angle lens, the angle of view of the fisheye lens is larger, but at the same time, the distortion is more serious. The fisheye image is generally circular. Has a strong sense of perspective convergence. Fisheye lenses are used in a wide range of fields, such as intelligent transportation, robot navigation, video conferencing, medical treatment, video surveillance, etc. Since the image captured by the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T7/80G06T3/40
CPCG06T5/006G06T7/80G06T3/4007G06T2207/10004
Inventor 张学武徐晓龙郝真付晗李丽媛
Owner HOHAI UNIV CHANGZHOU
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