Fisheye image distortion correction method based on elliptical division

A fisheye image and distortion correction technology, which is applied in image enhancement, image data processing, instruments, etc., can solve the problems of image information loss, inability to correct pixels well, edge distortion, etc.

Active Publication Date: 2018-02-13
HARBIN ENG UNIV
View PDF8 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Fisheye image distortion correction method based on elliptical division
  • Fisheye image distortion correction method based on elliptical division
  • Fisheye image distortion correction method based on elliptical division

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a fisheye image distortion correction method based on elliptical division, and belongs to the technical field of machine vision. The method mainly comprises the steps of calculating center coordinates and radius of a fisheye image, converting the fisheye image into a standard circle mode, dividing the fisheye image into four parts with two diagonal lines, and fitting each part with one part of an elliptic curve. According to the fisheye image distortion correction method based on the elliptical division, a coordinate mapping table is adopted to record a coordinate mapping relation between the fisheye image and a corrected image in the correction process, thus the coordinate mapping relation needs to be calculated only once, the algorithm effect and timeliness are good, and the method is applicable to real-time correction display of the fisheye image.

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 ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
CPCG06T5/006
Inventor 王岚陈光伟赵云明霍亚男路天宇
Owner HARBIN ENG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap