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A Fisheye Image Distortion Correction Method Based on Ellipse Segmentation

A fisheye image, distortion correction technology, applied in image enhancement, image data processing, instruments, etc., can solve problems such as poor pixel correction, loss of image information, edge distortion, etc.

Active Publication Date: 2021-03-30
HARBIN ENG UNIV
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Problems solved by technology

[0007] In summary, although the correction method based on the projection model has a good effect, it cannot completely correct the fisheye image on one image; according to the correction algorithm based on the plane (2D), although it can completely correct the fisheye image on one image However, the pixels in both dimensions of the fisheye image cannot be corrected well at the same time, and the distortion of the edge is still very serious; the correction algorithm based on the stereoscopic image (3D) is more representative of the calibration correction method, which requires The camera parameters and distortion parameters are obtained in advance, and the correction effect is good, but there is a loss of image information

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  • A Fisheye Image Distortion Correction Method Based on Ellipse Segmentation
  • A Fisheye Image Distortion Correction Method Based on Ellipse Segmentation
  • A Fisheye Image Distortion Correction Method Based on Ellipse Segmentation

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Embodiment Construction

[0036] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0037] The software environment of this embodiment is WINDOWS7, the operating environment is Microsoft Visual Studio2013, and the fisheye image acquisition system based on Teledyne DALSA camera.

[0038] The fisheye image correction method based on ellipse segmentation in this embodiment, such as figure 1 shown, including the following steps:

[0039] Step 1. Use the median scan method based on limit brightness difference to obtain the center coordinates and radius of the fisheye image, such as figure 2 shown.

[0040] Step 1.1, the so-called limit brightness difference method is the difference between the maximum brightness and the minimum brightness of pixels in a certain row (column) in the bitmap. The brightness of a color image can be calculated by the common I=0.59 r+0.11 g+0.3 b, where I represents the brightness, r represents the pixel...

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Abstract

The invention discloses a fisheye image distortion correction method based on ellipse segmentation, and belongs to the field of machine vision technology. The main steps are to calculate the center coordinates and radius of the fisheye image, convert the fisheye image into a standard circle form, divide the fisheye image into four parts with two diagonal lines, and fit each part with a part of the elliptic curve; correction In the process, a coordinate mapping table is used to record the coordinate mapping relationship between the fisheye image and the correction map. Therefore, the coordinate mapping relationship only needs to be calculated once. The algorithm has good effect and real-time performance, and is suitable for real-time correction display of fisheye images.

Description

technical field [0001] The invention belongs to the technical field of machine vision, and in particular relates to a fisheye image distortion correction method based on ellipse segmentation. Background technique [0002] The fisheye lens is a super wide-angle lens with a field of view of 170°-185°. In order to achieve the maximum viewing angle of the lens, the front lens of the lens has a short diameter and protrudes toward the front of the lens in a parabolic shape. The fisheye lens has a short focal length and a large viewing angle, and there is a geometric optical error between the imaging point and the ideal imaging point, also known as distortion. The distortion of the fisheye lens mainly includes radial distortion and tangential distortion. The radial distortion of the fisheye lens The main feature is that there is no distortion in the center, and the farther away from the center, the more serious the distortion. The tangential distortion of a fisheye lens is caused ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
CPCG06T5/80
Inventor 王岚陈光伟赵云明霍亚男路天宇
Owner HARBIN ENG UNIV